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Groups > comp.os.linux.misc > #69611 > unrolled thread
| Started by | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| First post | 2025-07-16 13:44 +0200 |
| Last post | 2025-10-22 12:52 +0100 |
| Articles | 20 on this page of 127 — 27 participants |
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Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-16 13:44 +0200
Re: Trouble with laptop display Marco Moock <mm@dorfdsl.de> - 2025-07-16 14:00 +0200
Re: Trouble with laptop display Java Jive <java@evij.com.invalid> - 2025-07-16 13:22 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-16 20:43 +0200
Re: Trouble with laptop display Marco Moock <mm@dorfdsl.de> - 2025-07-17 08:06 +0200
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-17 12:16 +0200
Re: Trouble with laptop display Arkadiusz 'Black Fox' Artyszuk <blackfox_pl@protonmail.com> - 2025-07-16 14:20 +0200
Re: Trouble with laptop display Robert Heller <heller@deepsoft.com> - 2025-07-16 12:39 +0000
Re: Trouble with laptop display Herbert Kleebauer <klee@unibwm.de> - 2025-07-16 14:43 +0200
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-16 10:29 -0400
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-16 20:42 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-16 16:49 +0100
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-16 11:52 -0500
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-16 20:41 +0200
Re: Trouble with laptop display Java Jive <java@evij.com.invalid> - 2025-07-16 21:11 +0100
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-16 17:21 -0400
Re: Trouble with laptop display "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-07-16 20:12 +0100
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-16 17:15 -0400
Re: Trouble with laptop display not@telling.you.invalid (Computer Nerd Kev) - 2025-07-17 09:10 +1000
Re: Trouble with laptop display Jack <Jack@invalid.invalid> - 2025-07-16 19:09 +0000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-16 22:30 +0200
Re: Trouble with laptop display Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-16 16:58 -0700
Re: Trouble with laptop display Robert Heller <heller@deepsoft.com> - 2025-07-17 01:58 +0000
Re: Trouble with laptop display Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-07-17 03:29 +0000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-17 12:21 +0200
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-16 18:12 -0500
Re: Trouble with laptop display Paul in Houston TX <Paul@Houston.Texas> - 2025-07-16 20:42 -0500
Re: Trouble with laptop display "J.O. Aho" <user@example.net> - 2025-07-17 08:34 +0200
Re: Trouble with laptop display c186282 <c186282@nnada.net> - 2025-07-17 03:37 -0400
Re: Trouble with laptop display "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-07-17 10:16 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-17 13:00 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 13:50 +0100
Re: Trouble with laptop display "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-07-17 17:04 +0100
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-17 13:11 -0500
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-17 20:25 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 19:58 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 08:51 +0200
Re: Trouble with laptop display Simon <SimonJ@eu.invalid> - 2025-07-18 06:04 +0000
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 11:12 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 12:48 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 13:31 +0100
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 19:57 +0100
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 19:50 +0100
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-17 13:04 -0500
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-17 20:29 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-17 19:56 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 09:01 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 11:14 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 12:26 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 13:29 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 21:18 +0200
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-17 16:22 -0500
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 09:13 +0200
Re: Trouble with laptop display "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-07-18 10:53 +0100
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-18 18:47 -0500
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-19 02:12 +0200
Re: Trouble with laptop display Hank Rogers <Hank@nospam.invalid> - 2025-07-18 19:53 -0500
Re: Trouble with laptop display VanguardLH <V@nguard.LH> - 2025-07-18 20:45 -0500
Re: Trouble with laptop display Hank Rogers <Hank@nospam.invalid> - 2025-07-18 21:22 -0500
mini-PC (was: Trouble with laptop display) Frank Slootweg <this@ddress.is.invalid> - 2025-07-18 19:58 +0000
Re: mini-PC "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 22:28 +0200
Re: mini-PC (was: Trouble with laptop display) c186282 <c186282@nnada.net> - 2025-07-18 23:38 -0400
Re: Trouble with laptop display Robert <invalid@invalid.invalid> - 2025-07-17 21:56 +0000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 09:49 +0200
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 11:08 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 11:11 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 12:22 +0200
Re: Trouble with laptop display Jack <Jack@invalid.invalid> - 2025-07-18 20:24 +0000
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 22:05 +0100
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-18 18:31 -0400
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-19 00:50 +0100
Re: Trouble with laptop display "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-07-19 01:35 +0100
Re: Trouble with laptop display Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-18 19:42 -0700
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-19 15:11 +0200
Re: Trouble with laptop display Simon <SimonJ@eu.invalid> - 2025-07-19 13:36 +0000
Re: Trouble with laptop display not@telling.you.invalid (Computer Nerd Kev) - 2025-07-20 09:55 +1000
Re: Trouble with laptop display rbowman <bowman@montana.com> - 2025-07-20 02:02 +0000
Re: Trouble with laptop display Daniel70 <daniel47@eternal-september.org> - 2025-07-20 21:10 +1000
Re: Trouble with laptop display Simon <SimonJ@eu.invalid> - 2025-07-20 05:00 +0000
Re: Trouble with laptop display Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-19 21:43 -0700
Re: Trouble with laptop display rbowman <bowman@montana.com> - 2025-07-20 05:29 +0000
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-20 07:34 -0400
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-20 21:04 +0200
Re: Trouble with laptop display Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-20 14:40 -0700
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-20 20:43 -0400
Re: Trouble with laptop display rbowman <bowman@montana.com> - 2025-07-21 04:42 +0000
Re: Trouble with laptop display rbowman <bowman@montana.com> - 2025-07-20 19:50 +0000
Re: Trouble with laptop display Daniel70 <daniel47@eternal-september.org> - 2025-07-21 19:41 +1000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-21 12:16 +0200
Re: Trouble with laptop display Daniel70 <daniel47@eternal-september.org> - 2025-07-21 22:26 +1000
Re: Trouble with laptop display Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-07-21 17:35 +0000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-21 19:55 +0200
Re: Trouble with laptop display Paul <nospam@needed.invalid> - 2025-07-21 17:37 -0400
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-22 00:36 +0200
Re: Trouble with laptop display Daniel70 <daniel47@eternal-september.org> - 2025-07-22 19:57 +1000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-22 12:08 +0200
Re: Trouble with laptop display Daniel70 <daniel47@eternal-september.org> - 2025-07-22 21:38 +1000
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-22 12:46 +0100
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-20 12:54 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-20 20:55 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-20 20:22 +0100
Re: Trouble with laptop display rbowman <bowman@montana.com> - 2025-07-20 19:54 +0000
Re: Trouble with laptop display Simon <SimonJ@eu.invalid> - 2025-07-21 09:02 +0000
Re: Trouble with laptop display Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-19 21:44 -0700
Re: Trouble with laptop display Java Jive <java@evij.com.invalid> - 2025-07-20 13:41 +0100
Re: Trouble with laptop display "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-07-20 17:52 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-20 21:05 +0200
Re: Trouble with laptop display rbowman <bowman@montana.com> - 2025-07-20 19:56 +0000
Re: Trouble with laptop display Java Jive <java@evij.com.invalid> - 2025-07-21 12:55 +0100
Re: Trouble with laptop display Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2025-07-20 15:00 -0700
Re: Trouble with laptop display Robert Riches <spamtrap42@jacob21819.net> - 2025-07-22 02:43 +0000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 23:25 +0200
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-19 00:07 +0200
Re: Trouble with laptop display - drm ebook fallout "Carlos E.R." <robin_listas@es.invalid> - 2025-08-06 14:29 +0200
Re: Trouble with laptop display - drm ebook fallout Frank Slootweg <this@ddress.is.invalid> - 2025-08-06 18:04 +0000
Re: Trouble with laptop display - drm ebook fallout "Carlos E.R." <robin_listas@es.invalid> - 2025-08-06 20:33 +0200
Re: Trouble with laptop display - drm ebook fallout "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-08-06 23:39 +0100
Re: Trouble with laptop display - drm ebook fallout Rich <rich@example.invalid> - 2025-08-07 00:36 +0000
Re: Trouble with laptop display - drm ebook fallout rbowman <bowman@montana.com> - 2025-08-07 01:53 +0000
Re: Trouble with laptop display - drm ebook fallout "Carlos E.R." <robin_listas@es.invalid> - 2025-08-07 13:53 +0200
Re: Trouble with laptop display - drm ebook fallout Daniel70 <daniel47@somewhere.someplaceelse> - 2025-08-07 20:01 +1000
Re: Trouble with laptop display - drm ebook fallout "J. P. Gilliver" <G6JPG@255soft.uk> - 2025-08-07 13:05 +0100
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-07-18 11:08 +0100
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-07-18 21:22 +0200
Re: Trouble with laptop display Jasen Betts <usenet@revmaps.no-ip.org> - 2025-10-22 11:04 +0000
Re: Trouble with laptop display "Carlos E.R." <robin_listas@es.invalid> - 2025-10-22 13:44 +0200
Re: Trouble with laptop display The Natural Philosopher <tnp@invalid.invalid> - 2025-10-22 12:52 +0100
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-07-16 13:44 +0200 |
| Subject | Trouble with laptop display |
| Message-ID | <7tfkklx99v.ln2@Telcontar.valinor> |
Hi, I have an old Compaq Presario CQ61-330SS laptop, which I think I bought around 2010. Battery died, I replaced it, also died eventually. Currently I only use it to watch movies (it has very good internal speakers), when exercising on an static bike. <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html> Some months ago, the display went black on boot, but closing the lid and opening it again made it work. Today it is impossible, it goes dark instants after opening the lid. I have repeated the operation dozens of times. It happens before booting and keeps doing it after booting. It makes the thing totally unusable. I just replaced the CMOS battery (it reads 3 volts). On boot, it says something about replaced battery, needs to reset, but I don't have time to read what key to press, if any. So that battery was not the problem. Installed system is openSUSE, some old version, I don't remember which. I can not ssh to it, says cer@Telcontar:~> ssh root@minas-tirith Bad server host key: Invalid key length cer@Telcontar:~> It also has Windows. But the problem happens before booting, so the operating system is not involved. What do you think may be going on? -- Cheers, Carlos.
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| From | Marco Moock <mm@dorfdsl.de> |
|---|---|
| Date | 2025-07-16 14:00 +0200 |
| Message-ID | <105848r$3vf6r$5@paganini.bofh.team> |
| In reply to | #69611 |
On 16.07.2025 13:44 Carlos E.R. wrote: > Some months ago, the display went black on boot, but closing the lid > and opening it again made it work. Today it is impossible, it goes > dark instants after opening the lid. I have repeated the operation > dozens of times. It happens before booting and keeps doing it after > booting. It makes the thing totally unusable. Does an external monitor work? It may be a faulty LCD panel, but also a faulty graphics card.
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| From | Java Jive <java@evij.com.invalid> |
|---|---|
| Date | 2025-07-16 13:22 +0100 |
| Message-ID | <10585hn$nnfq$1@dont-email.me> |
| In reply to | #69612 |
On 2025-07-16 13:00, Marco Moock wrote: > On 16.07.2025 13:44 Carlos E.R. wrote: > >> Some months ago, the display went black on boot, but closing the lid >> and opening it again made it work. Today it is impossible, it goes >> dark instants after opening the lid. I have repeated the operation >> dozens of times. It happens before booting and keeps doing it after >> booting. It makes the thing totally unusable. > > Does an external monitor work? > > It may be a faulty LCD panel, but also a faulty graphics card. Or simply a loose connection on the cable between the two, which happened to me on a Dell Inspiron 15RSE 7520. As the computer is turned on it warms up, and after turning off it cools down, and sometimes the small changes in the dimensions of things associated with this thermal cycling can gradually 'walk' cable connectors off or out of their other half on the PCB. For this reason they are often held in place with sticky tape, glue, or some such, but if in the past the computer has been repaired such seals may not have been replaced, or may no longer hold so well. -- Fake news kills! I may be contacted via the contact address given on my website: www.macfh.co.uk
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-07-16 20:43 +0200 |
| Message-ID | <uf8lklxffk.ln2@Telcontar.valinor> |
| In reply to | #69612 |
On 2025-07-16 14:00, Marco Moock wrote: > On 16.07.2025 13:44 Carlos E.R. wrote: > >> Some months ago, the display went black on boot, but closing the lid >> and opening it again made it work. Today it is impossible, it goes >> dark instants after opening the lid. I have repeated the operation >> dozens of times. It happens before booting and keeps doing it after >> booting. It makes the thing totally unusable. > > Does an external monitor work? It is an VGA plug. I will have to try. It is not easy to rig it. I can do it temporarily, but that would not be a permanent solution. It is either repair or garbage. > > It may be a faulty LCD panel, but also a faulty graphics card. As to what Java says about previous repairs, no, the machine has not been repaired. Once I replaced the internal rotating rust HD with an SSD. [...] Following on VanguardLH hint, it is the backlight. -- Cheers, Carlos.
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| From | Marco Moock <mm@dorfdsl.de> |
|---|---|
| Date | 2025-07-17 08:06 +0200 |
| Message-ID | <105a3tb$8uua$1@paganini.bofh.team> |
| In reply to | #69637 |
On 16.07.2025 20:43 Carlos E.R. wrote: > Following on VanguardLH hint, it is the backlight. If that is the issue, you should see content if you light the screen with a flashlight.
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-07-17 12:16 +0200 |
| Message-ID | <85vmklxka8.ln2@Telcontar.valinor> |
| In reply to | #69658 |
On 2025-07-17 08:06, Marco Moock wrote: > On 16.07.2025 20:43 Carlos E.R. wrote: > >> Following on VanguardLH hint, it is the backlight. > > If that is the issue, you should see content if you light the screen > with a flashlight. That's exactly what Vanguard said and I did. I don't know why I didn't think of that before. -- Cheers, Carlos.
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| From | Arkadiusz 'Black Fox' Artyszuk <blackfox_pl@protonmail.com> |
|---|---|
| Date | 2025-07-16 14:20 +0200 |
| Message-ID | <10585dp$hlp$1@news.chmurka.net> |
| In reply to | #69611 |
Carlos E.R. wrote: > Some months ago, the display went black on boot, but closing the lid and > opening it again made it work. Today it is impossible, it goes dark > instants after opening the lid. I have repeated the operation dozens of > times. It happens before booting and keeps doing it after booting. It > makes the thing totally unusable. In addition to what Marco wrote I just add that sometimes such behavior may be caused by broken cable connecting LCD panel with motherboard. -- Regards Arkadiusz 'Black Fox' Artyszuk
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| From | Robert Heller <heller@deepsoft.com> |
|---|---|
| Date | 2025-07-16 12:39 +0000 |
| Message-ID | <10586it$ntkh$1@dont-email.me> |
| In reply to | #69611 |
Backlight problem? Eg flacky/dieing/etc. backlight power supply. It could also be the lid switch (stuck, contacts wornout, etc.). Could also be a dead LCD. Does it have a VGA (external monitor) connector? Getting an old VGA monitor might be an option. (Might be easier / cheaper than replacing the screen and/or backlight power supply or lid switch. It might also be possible to get a "parts model" off E-Bay cheap and do some transplant surgery,,, At Wed, 16 Jul 2025 13:44:07 +0200 "Carlos E.R." <robin_listas@es.invalid> wrote: > > Hi, > > I have an old Compaq Presario CQ61-330SS laptop, which I think I bought > around 2010. Battery died, I replaced it, also died eventually. > Currently I only use it to watch movies (it has very good internal > speakers), when exercising on an static bike. > > <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html> > > Some months ago, the display went black on boot, but closing the lid and > opening it again made it work. Today it is impossible, it goes dark > instants after opening the lid. I have repeated the operation dozens of > times. It happens before booting and keeps doing it after booting. It > makes the thing totally unusable. > > I just replaced the CMOS battery (it reads 3 volts). On boot, it says > something about replaced battery, needs to reset, but I don't have time > to read what key to press, if any. > > So that battery was not the problem. > > > Installed system is openSUSE, some old version, I don't remember which. > I can not ssh to it, says > > cer@Telcontar:~> ssh root@minas-tirith > Bad server host key: Invalid key length > cer@Telcontar:~> > > It also has Windows. > > But the problem happens before booting, so the operating system is not > involved. > > > What do you think may be going on? > -- Robert Heller -- Cell: 413-658-7953 GV: 978-633-5364 Deepwoods Software -- Custom Software Services http://www.deepsoft.com/ -- Linux Administration Services heller@deepsoft.com -- Webhosting Services
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| From | Herbert Kleebauer <klee@unibwm.de> |
|---|---|
| Date | 2025-07-16 14:43 +0200 |
| Message-ID | <10586p6$nsc8$1@dont-email.me> |
| In reply to | #69611 |
On 16.07.2025 13:44, Carlos E.R. wrote: > I just replaced the CMOS battery (it reads 3 volts). On boot, it says > something about replaced battery, needs to reset, but I don't have time > to read what key to press, if any. If it displays this text, the display can't be defect. Use a smartphone or any other cam to record the display while booting. Then watch the recorded video to read the text.
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| From | Paul <nospam@needed.invalid> |
|---|---|
| Date | 2025-07-16 10:29 -0400 |
| Message-ID | <1058cvp$p7s3$1@dont-email.me> |
| In reply to | #69611 |
On Wed, 7/16/2025 7:44 AM, Carlos E.R. wrote:
> Hi,
>
> I have an old Compaq Presario CQ61-330SS laptop, which I think I bought around 2010. Battery died, I replaced it, also died eventually. Currently I only use it to watch movies (it has very good internal speakers), when exercising on an static bike.
>
> <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html>
>
> Some months ago, the display went black on boot, but closing the lid and opening it again made it work. Today it is impossible, it goes dark instants after opening the lid. I have repeated the operation dozens of times. It happens before booting and keeps doing it after booting. It makes the thing totally unusable.
>
> I just replaced the CMOS battery (it reads 3 volts). On boot, it says something about replaced battery, needs to reset, but I don't have time to read what key to press, if any.
>
> So that battery was not the problem.
>
>
> Installed system is openSUSE, some old version, I don't remember which. I can not ssh to it, says
>
> cer@Telcontar:~> ssh root@minas-tirith
> Bad server host key: Invalid key length
> cer@Telcontar:~>
>
> It also has Windows.
>
> But the problem happens before booting, so the operating system is not involved.
>
>
> What do you think may be going on?
>
If the unit has an intensity control, such as one of the old dial-adjust ones,
that will reduce the electrical load of the CCFL backlight, to keep it lit.
Devices where the intensity control is a OSD control, well, it's going to be
pretty hard to see the screen and turn down the intensity. On some panels,
holding a strong light near the back of the disassembly, may allow seeing
the OSD.
It's something like this. Only a small panel uses a single CCFL.
700-1000VAC 25KHz Sine wave
14.4VDC ------ inverter-board ------------------------------- CCFL tube (inside panel ?)
"How to Replace a Compaq Presario CQ61 LCD Inverter"
https://www.youtube.com/watch?v=gZ8uAvI7JBk
The inverter board has a "strike" voltage (1000V) and this causes the initial conduction
in the (cold) CCFL backlight tube. The tube warms enough so the trace mercury is vaporized a bit.
As the tube warms, it conducts more current (3mA) and the inverter board responds
by dropping the voltage to, say, 700 VAC. The 700VAC in this case, is termed the
"burn" voltage and is the normal operating voltage as the thing stabilizes. It
can take 20 minutes, for the optical properties of a CCFL to settle completely
(instructions on my scanner).
The inverter is power limited. If at this point, the inverter is in a weakened
state, or, the CCFL is drawing more than normal, the inverter can shut off in
response. It goes from driving 700V to 0V.
More modern laptops use LEDs for backlight. The LEDs edge-light a piece of some
sort of plastic that distributes the edge light. This can make shadows or blooming
along one edge. One of the problems with the idea of LED backlights, is the LED
backlight area has poor cooling. The LED area can get hot enough, to melt the
plastic diffuser element, ruining the smooth distribution of the light. So while
on the surface, a LED based solution seems the reliable choice, it really has
its own set of issues and is not a perfect solution. The LED output drops with
age, in the same way that the CCFL tube output drops with age (the display
color turns brown, if you actually wear out a CCFL tube). CCFL and LED can last
for 25,000 hours. The electrodes on the CCFL, sputter onto the glass, which
yields a brown color for the light output at 25000 hours.
Large displays in the past, had as many as 16 CCFL tubes, at about 3 watts each.
This used to throw off enough infrared, as you walked past the display when
the display was on, you could "feel" the heat hit your face, from the raft of
CCFL tubes. It might take four quads to drive that many CCFL, or eight dual output
inverters to do the job. If a single inverter dies on one of those, the screen is
not completely black.
The inverters are AC coupled to the CCFL tube. With 2kV capacitors. This means
the amount of coupling required, the caps might only be 33pF or so. A very tiny
capacitance. If there is any "foil" in the area of the tube (which you likely
won't be working on in this case), do not bend/fold/mutilate the foil, since
the foil also represents a capacitance. Messing with the foil, when the designer
intended the foil to couple to the tube a bit, causes the tube to malfunction
with your new inverter. When an inverter is a dual or a quad, there are more HV
connectors and coupling caps for the tube(s) connected.
So why all the goofy care, about "sine waves" and shit ? The tube cannot have
a DC component across it. Only AC may be applied to the tube. The sloshing
of AC, helps reduce the damage to the CCFL electrodes over lifetime. This is
why the thing is specified with sine wave drive. By modulating the inverter,
and not putting out continuous sine waves, you can achieve dimming... without
changing the peak voltage, and this keeps the CCFL in "burn" state when
the intensity is set to lower values. _XXXXXX______XXXXXX______XXXXXX_
Those are bursts of 25KHz sine waves, 50% intensity.
I don't know if you can get at the tube-area for your LCD panel, but
after viewing the video above, you can bet it would be a bear to get at :-)
Summary: Reduce electrical load on inverter, by reducing the intensity setting.
This will give about three weeks of service, before it quits for good.
The video has a baggy with a part number on it. That could be the
inverter they are trying to sell to people.
Inverters and tubes, work as a pair. The characteristics should match.
The CCFL tube is unlikely to have a part number on it. If the inverter
has the wrong capacity, it could overdrive or underdrive the CCFL and so on.
It's not a well-specified area, except for a person who does a lot of
these, and they feel they have the right "generic" inverter for the job.
Some CCFL tubes are longer than others, the "strike" voltage is slightly
different and so on. The foils must be put back as you found them.
A USENETter in sci.electronics, wrote an entire book about this, and
the book was provided free by his employer. That's where I got the hint
about the foils, and how some lighting designers, don't actually understand
how the CCFL circuit works. And the results are comedic failures for other
people to try and fix.
Paul
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-07-16 20:42 +0200 |
| Message-ID | <ge8lklxffk.ln2@Telcontar.valinor> |
| In reply to | #69617 |
On 2025-07-16 16:29, Paul wrote: > On Wed, 7/16/2025 7:44 AM, Carlos E.R. wrote: >> Hi, >> >> I have an old Compaq Presario CQ61-330SS laptop, which I think I bought around 2010. Battery died, I replaced it, also died eventually. Currently I only use it to watch movies (it has very good internal speakers), when exercising on an static bike. >> >> <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html> >> >> Some months ago, the display went black on boot, but closing the lid and opening it again made it work. Today it is impossible, it goes dark instants after opening the lid. I have repeated the operation dozens of times. It happens before booting and keeps doing it after booting. It makes the thing totally unusable. >> >> I just replaced the CMOS battery (it reads 3 volts). On boot, it says something about replaced battery, needs to reset, but I don't have time to read what key to press, if any. >> >> So that battery was not the problem. >> >> >> Installed system is openSUSE, some old version, I don't remember which. I can not ssh to it, says >> >> cer@Telcontar:~> ssh root@minas-tirith >> Bad server host key: Invalid key length >> cer@Telcontar:~> >> >> It also has Windows. >> >> But the problem happens before booting, so the operating system is not involved. >> >> >> What do you think may be going on? >> > > If the unit has an intensity control, such as one of the old dial-adjust ones, > that will reduce the electrical load of the CCFL backlight, to keep it lit. No, no such thing. I recall having adjusted intensity on software, but I don't think it was this laptop. > Devices where the intensity control is a OSD control, well, it's going to be > pretty hard to see the screen and turn down the intensity. On some panels, > holding a strong light near the back of the disassembly, may allow seeing > the OSD. > > It's something like this. Only a small panel uses a single CCFL. > > 700-1000VAC 25KHz Sine wave > 14.4VDC ------ inverter-board ------------------------------- CCFL tube (inside panel ?) Ah, yes. > > > "How to Replace a Compaq Presario CQ61 LCD Inverter" > > https://www.youtube.com/watch?v=gZ8uAvI7JBk > > The inverter board has a "strike" voltage (1000V) and this causes the initial conduction > in the (cold) CCFL backlight tube. The tube warms enough so the trace mercury is vaporized a bit. > As the tube warms, it conducts more current (3mA) and the inverter board responds > by dropping the voltage to, say, 700 VAC. The 700VAC in this case, is termed the > "burn" voltage and is the normal operating voltage as the thing stabilizes. It > can take 20 minutes, for the optical properties of a CCFL to settle completely > (instructions on my scanner). > > The inverter is power limited. If at this point, the inverter is in a weakened > state, or, the CCFL is drawing more than normal, the inverter can shut off in > response. It goes from driving 700V to 0V. > Right. > More modern laptops use LEDs for backlight. The LEDs edge-light a piece of some > sort of plastic that distributes the edge light. This can make shadows or blooming > along one edge. One of the problems with the idea of LED backlights, is the LED > backlight area has poor cooling. The LED area can get hot enough, to melt the > plastic diffuser element, ruining the smooth distribution of the light. So while > on the surface, a LED based solution seems the reliable choice, it really has > its own set of issues and is not a perfect solution. The LED output drops with > age, in the same way that the CCFL tube output drops with age (the display > color turns brown, if you actually wear out a CCFL tube). CCFL and LED can last > for 25,000 hours. The electrodes on the CCFL, sputter onto the glass, which > yields a brown color for the light output at 25000 hours. No, I did not notice degradation. > Large displays in the past, had as many as 16 CCFL tubes, at about 3 watts each. > This used to throw off enough infrared, as you walked past the display when > the display was on, you could "feel" the heat hit your face, from the raft of > CCFL tubes. It might take four quads to drive that many CCFL, or eight dual output > inverters to do the job. If a single inverter dies on one of those, the screen is > not completely black. I see, but this machine is not that big. Let me see, the display is 35cm*20cm. > > The inverters are AC coupled to the CCFL tube. With 2kV capacitors. This means > the amount of coupling required, the caps might only be 33pF or so. A very tiny > capacitance. If there is any "foil" in the area of the tube (which you likely > won't be working on in this case), do not bend/fold/mutilate the foil, since > the foil also represents a capacitance. Messing with the foil, when the designer > intended the foil to couple to the tube a bit, causes the tube to malfunction > with your new inverter. When an inverter is a dual or a quad, there are more HV > connectors and coupling caps for the tube(s) connected. > > So why all the goofy care, about "sine waves" and shit ? The tube cannot have > a DC component across it. Only AC may be applied to the tube. The sloshing > of AC, helps reduce the damage to the CCFL electrodes over lifetime. This is > why the thing is specified with sine wave drive. By modulating the inverter, > and not putting out continuous sine waves, you can achieve dimming... without > changing the peak voltage, and this keeps the CCFL in "burn" state when > the intensity is set to lower values. _XXXXXX______XXXXXX______XXXXXX_ > Those are bursts of 25KHz sine waves, 50% intensity. > > I don't know if you can get at the tube-area for your LCD panel, but > after viewing the video above, you can bet it would be a bear to get at :-) No, I would try to find some shop to do it, I'm not up to the task. Or, I would garbage the thing and get something else. Maybe a tablet. Or get a second hand laptop. Hum, I do have a 32 bit old laptop somewhere. > > Summary: Reduce electrical load on inverter, by reducing the intensity setting. > This will give about three weeks of service, before it quits for good. > > The video has a baggy with a part number on it. That could be the > inverter they are trying to sell to people. > > Inverters and tubes, work as a pair. The characteristics should match. > The CCFL tube is unlikely to have a part number on it. If the inverter > has the wrong capacity, it could overdrive or underdrive the CCFL and so on. > It's not a well-specified area, except for a person who does a lot of > these, and they feel they have the right "generic" inverter for the job. > Some CCFL tubes are longer than others, the "strike" voltage is slightly > different and so on. The foils must be put back as you found them. > > A USENETter in sci.electronics, wrote an entire book about this, and > the book was provided free by his employer. That's where I got the hint > about the foils, and how some lighting designers, don't actually understand > how the CCFL circuit works. And the results are comedic failures for other > people to try and fix. Not keen on trying, so thanks for the description. :-) [...] Following on VanguardLH hint, it is the backlight. -- Cheers, Carlos.
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| From | The Natural Philosopher <tnp@invalid.invalid> |
|---|---|
| Date | 2025-07-16 16:49 +0100 |
| Message-ID | <1058hlv$pg5q$12@dont-email.me> |
| In reply to | #69611 |
On 16/07/2025 12:44, Carlos E.R. wrote: > Hi, > > I have an old Compaq Presario CQ61-330SS laptop, which I think I bought > around 2010. Battery died, I replaced it, also died eventually. > Currently I only use it to watch movies (it has very good internal > speakers), when exercising on an static bike. > > <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html> > > Some months ago, the display went black on boot, but closing the lid and > opening it again made it work. Today it is impossible, it goes dark > instants after opening the lid. I have repeated the operation dozens of > times. It happens before booting and keeps doing it after booting. It > makes the thing totally unusable. > > I just replaced the CMOS battery (it reads 3 volts). On boot, it says > something about replaced battery, needs to reset, but I don't have time > to read what key to press, if any. > > So that battery was not the problem. > > > Installed system is openSUSE, some old version, I don't remember which. > I can not ssh to it, says > > cer@Telcontar:~> ssh root@minas-tirith > Bad server host key: Invalid key length > cer@Telcontar:~> > > It also has Windows. > > But the problem happens before booting, so the operating system is not > involved. > > > What do you think may be going on? > Ive watched enough laptop repair videos to hazard a guess that there is a hardware fault associated with power management Strip it for parts and bin it. Life's too short -- “The ultimate result of shielding men from the effects of folly is to fill the world with fools.” Herbert Spencer
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| From | VanguardLH <V@nguard.LH> |
|---|---|
| Date | 2025-07-16 11:52 -0500 |
| Message-ID | <1g2p8dv6u6h04.dlg@v.nguard.lh> |
| In reply to | #69611 |
"Carlos E.R." <robin_listas@es.invalid> wrote: > Hi, > > I have an old Compaq Presario CQ61-330SS laptop, which I think I bought > around 2010. Battery died, I replaced it, also died eventually. > Currently I only use it to watch movies (it has very good internal > speakers), when exercising on an static bike. > > <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html> > > Some months ago, the display went black on boot, but closing the lid and > opening it again made it work. Today it is impossible, it goes dark > instants after opening the lid. I have repeated the operation dozens of > times. It happens before booting and keeps doing it after booting. It > makes the thing totally unusable. > > I just replaced the CMOS battery (it reads 3 volts). On boot, it says > something about replaced battery, needs to reset, but I don't have time > to read what key to press, if any. > > So that battery was not the problem. > > Installed system is openSUSE, some old version, I don't remember which. > I can not ssh to it, says > > cer@Telcontar:~> ssh root@minas-tirith > Bad server host key: Invalid key length > cer@Telcontar:~> > > It also has Windows. > > But the problem happens before booting, so the operating system is not > involved. > > What do you think may be going on? Take a flashlight, and shine it at the display at an angle. Can you see what would have been displayed if the backlamps came on?
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| From | "Carlos E.R." <robin_listas@es.invalid> |
|---|---|
| Date | 2025-07-16 20:41 +0200 |
| Message-ID | <gc8lklxffk.ln2@Telcontar.valinor> |
| In reply to | #69627 |
On 2025-07-16 18:52, VanguardLH wrote: > "Carlos E.R." <robin_listas@es.invalid> wrote: > >> Hi, >> >> I have an old Compaq Presario CQ61-330SS laptop, which I think I bought >> around 2010. Battery died, I replaced it, also died eventually. >> Currently I only use it to watch movies (it has very good internal >> speakers), when exercising on an static bike. >> >> <https://icecat.es/es/p/hp/vk845ea/compaq+presario-laptops-0884962367797-cq61-330ss-3589205.html> >> >> Some months ago, the display went black on boot, but closing the lid and >> opening it again made it work. Today it is impossible, it goes dark >> instants after opening the lid. I have repeated the operation dozens of >> times. It happens before booting and keeps doing it after booting. It >> makes the thing totally unusable. >> >> I just replaced the CMOS battery (it reads 3 volts). On boot, it says >> something about replaced battery, needs to reset, but I don't have time >> to read what key to press, if any. >> >> So that battery was not the problem. >> >> Installed system is openSUSE, some old version, I don't remember which. >> I can not ssh to it, says >> >> cer@Telcontar:~> ssh root@minas-tirith >> Bad server host key: Invalid key length >> cer@Telcontar:~> >> >> It also has Windows. >> >> But the problem happens before booting, so the operating system is not >> involved. >> >> What do you think may be going on? > > Take a flashlight, and shine it at the display at an angle. Can you see > what would have been displayed if the backlamps came on? I can easily try that. [...] You are absolutely right, I can see the Compaq logo as it tries to boot. So, unless it is a faulty cable, it is garbage time. -- Cheers, Carlos.
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| From | Java Jive <java@evij.com.invalid> |
|---|---|
| Date | 2025-07-16 21:11 +0100 |
| Message-ID | <1058tgf$soo2$1@dont-email.me> |
| In reply to | #69636 |
On 2025-07-16 19:41, Carlos E.R. wrote: > > I can easily try that. [...] You are absolutely right, I can see the > Compaq logo as it tries to boot. > > So, unless it is a faulty cable, it is garbage time. If it's not the cable, it might well be worth looking on eBay for a lid/display to buy used as a unit - it's usually much easier to change the lid and display as a unit rather than just the display. However, I have no experience of dismantling Compaq laptops, so am unable to comment further. -- Fake news kills! I may be contacted via the contact address given on my website: www.macfh.co.uk
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| From | Paul <nospam@needed.invalid> |
|---|---|
| Date | 2025-07-16 17:21 -0400 |
| Message-ID | <105954j$uap4$1@dont-email.me> |
| In reply to | #69639 |
On Wed, 7/16/2025 4:11 PM, Java Jive wrote: > On 2025-07-16 19:41, Carlos E.R. wrote: >> >> I can easily try that. [...] You are absolutely right, I can see the Compaq logo as it tries to boot. >> >> So, unless it is a faulty cable, it is garbage time. > > If it's not the cable, it might well be worth looking on eBay for a lid/display to buy used as a unit - it's usually much easier to change the lid and display as a unit rather than just the display. However, I have no experience of dismantling Compaq laptops, so am unable to comment further. > The video for that particular model, it is a hell filled with screws. That's just so you can get at the hinges and release the panel from the base. I'd get a shop to do it, bring in your "carcass for parts" and "the good laptop" and do a head-ectomy. The only problem is, the typical carcass machine, the screen is broken. Working with carcasses can be cheaper than buying individual parts, one part at a time. Like if a machine had a battery failure and the user was selling it, that would be an excellent source of parts. I'm going by the description of the panel opening, and there is no reportage of "glitching" indicating the data connection to the panel is bad. Merely that opening the panel, gives the inverter another chance to start the CCFL. Paul
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| From | "J. P. Gilliver" <G6JPG@255soft.uk> |
|---|---|
| Date | 2025-07-16 20:12 +0100 |
| Message-ID | <1058tit$koge$2@dont-email.me> |
| In reply to | #69636 |
On 2025/7/16 19:41:52, Carlos E.R. wrote: > On 2025-07-16 18:52, VanguardLH wrote: [] >> Take a flashlight, and shine it at the display at an angle. Can you see >> what would have been displayed if the backlamps came on? > > I can easily try that. [...] You are absolutely right, I can see the > Compaq logo as it tries to boot. > > > So, unless it is a faulty cable, it is garbage time. > Certainly worth a try. Would be a pity to junk it just because something has come loose. The fact that you said it had given problems in the past that were curable by closing and opening it definitely _suggests_ either the connector, or the hinge switch, may be loose - though the inverter could indeed be flaky. But have a look first! If it _is_ backlight failure, still worth replacing (I'd say the whole display-plus-backlight assembly rather than trying to separate the latter) - especially if you can find a parts one of the same model where "display works but won't boot", "no HD", or similar, for peanuts. -- J. P. Gilliver. UMRA: 1960/<1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf You'll need to have this fish in your ear. (First series, fit the first.)
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| From | Paul <nospam@needed.invalid> |
|---|---|
| Date | 2025-07-16 17:15 -0400 |
| Message-ID | <10594p0$u8g6$1@dont-email.me> |
| In reply to | #69641 |
On Wed, 7/16/2025 3:12 PM, J. P. Gilliver wrote: > On 2025/7/16 19:41:52, Carlos E.R. wrote: >> On 2025-07-16 18:52, VanguardLH wrote: > > [] > >>> Take a flashlight, and shine it at the display at an angle. Can you see >>> what would have been displayed if the backlamps came on? >> >> I can easily try that. [...] You are absolutely right, I can see the Compaq logo as it tries to boot. >> >> >> So, unless it is a faulty cable, it is garbage time. >> > > Certainly worth a try. Would be a pity to junk it just because something has come loose. The fact that you said it had given problems in the past that were curable by closing and opening it definitely _suggests_ either the connector, or the hinge switch, may be loose - though the inverter could indeed be flaky. But have a look first! > > If it _is_ backlight failure, still worth replacing (I'd say the whole display-plus-backlight assembly rather than trying to separate the latter) - especially if you can find a parts one of the same model where "display works but won't boot", "no HD", or similar, for peanuts. You can use a flashlight with some displays, to check for a response from LCD. They're pressing the flashlight up against the front surface of the screen. https://www.youtube.com/watch?v=HyEdbufQuNM Be careful not to scratch the screen, as the front surface of your flashlight can be rough. Paul
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| From | not@telling.you.invalid (Computer Nerd Kev) |
|---|---|
| Date | 2025-07-17 09:10 +1000 |
| Message-ID | <68783165@news.ausics.net> |
| In reply to | #69641 |
In comp.os.linux.misc J. P. Gilliver <G6JPG@255soft.uk> wrote: > On 2025/7/16 19:41:52, Carlos E.R. wrote: >> On 2025-07-16 18:52, VanguardLH wrote: >>> Take a flashlight, and shine it at the display at an angle. Can you see >>> what would have been displayed if the backlamps came on? >> >> I can easily try that. [...] You are absolutely right, I can see the >> Compaq logo as it tries to boot. >> >> So, unless it is a faulty cable, it is garbage time. > > Certainly worth a try. Would be a pity to junk it just because something > has come loose. The fact that you said it had given problems in the past > that were curable by closing and opening it definitely _suggests_ either > the connector, or the hinge switch, may be loose - though the inverter > could indeed be flaky. But have a look first! Actually there's no inverter, the service manual* states that it's an "LED Display Assembly" and no separate backlight board is listed. So an LED backlight. It could still be an issue with the power supply for the LEDs, but potentially an issue on the motherboard, not easily fixed by replacing a separate board. Or a faulty wire/connector is still possible, though replacing modern connectors for FFC cables is extremely difficult compared to eg. a failed through-hole inverter capacitor, so I'd be most worried about that really. I recently stuffed up one of my successful repairs when I broke one of those unfathomably fine-pitched connectors while reassembling the device afterwards. Extremely frustrating! Oh for 1980s tech and its 0.1" spaced pin headers... * https://h10032.www1.hp.com/ctg/Manual/c01740724.pdf (pg. 26) -- __ __ #_ < |\| |< _#
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| From | Jack <Jack@invalid.invalid> |
|---|---|
| Date | 2025-07-16 19:09 +0000 |
| Message-ID | <1058tiv$24u4$1@paganini.bofh.team> |
| In reply to | #69636 |
On 16/07/2025 19:41, Carlos E.R. wrote: > > So, unless it is a faulty cable, it is garbage time. > Before throwing away the machine, try to reinstall Windows or better still boot up with live Linux distro to see if it is the OS corruption or something else. I had similar issues about a year ago but as soon as I reinstalled Windows, everything started to work normally. You can reinstall and keep everything but as there is no display this will prove difficult but a clean install will do the trick. Repair install I'm not sure because it has never worked for me. Try the Live Linux distro first to see if the display works.
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