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Re: Strange PC Video Fault

From Paul <nospam@needed.invalid>
Newsgroups alt.os.linux, uk.comp.os.linux, alt.windows7.general
Subject Re: Strange PC Video Fault
Date 2024-08-01 14:33 -0400
Organization A noiseless patient Spider
Message-ID <v8gkdk$2arv3$1@dont-email.me> (permalink)
References (1 earlier) <8lokajt4s9oerlc2ic100i57gjl2ph1r51@4ax.com> <v8e65c$1o8ue$1@dont-email.me> <v8eruh$1vh1q$1@dont-email.me> <v8g2lk$269ot$1@dont-email.me> <20240801143540.5a91d7ca@devuan>

Cross-posted to 3 groups.

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On Thu, 8/1/2024 9:35 AM, Folderol wrote:
> On Thu, 1 Aug 2024 14:30:26 +0100
> Java Jive <java@evij.com.invalid> wrote:
> 
>> I've already thought of that, a screenshot taken with <PrintScreen> or 
>> <Alt-PrintScreen> when viewed on another PC is free of the fault.
>>
> 
> The it's *definitely* either screen and/or screen connecting cable
> 

This could be the screen connecting cable.

   https://en.wikipedia.org/wiki/Transition-minimized_differential_signaling

It claims the I/O is DC coupled (unlike PCI express, which is capacitively coupled).
If a wire breaks, perhaps the output is a fixed set of symbols for that gun.
Like most low amplitude diff signalling on a computer, the termination is 100 ohms
(across each pair).

The I/O needs four pairs (RGB Clock), three grounds for crosstalk isolation,
then +12V and GND for power for the panel. If the data rate was 1650Mb/sec,
the clock would be 165MHz. A PLL synthesizes a sampling clock (1650MHz).

The panel needs to derive a signal called DE (Display Enable), which is a
logic 1 for visible parts of the screen and logic 0 for the rest. If the
panel cannot make DE, then the image should be a black screen. the 8B10B code
provides opportunities (JK) for sending synchronization primitives. In its
way, DE is the embodiment of HSYNC/VSYNC.

   Paul

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Thread

Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-07-31 13:22 +0100
  Re: Strange PC Video Fault sticks <wolverine01@charter.net> - 2024-07-31 08:30 -0500
  Re: Strange PC Video Fault Paul <nospam@needed.invalid> - 2024-07-31 09:54 -0400
    Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-07-31 20:09 +0100
  Re: Strange PC Video Fault Char Jackson <none@none.invalid> - 2024-07-31 11:18 -0500
    Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-07-31 21:17 +0100
      Re: Strange PC Video Fault Andy Burns <usenet@andyburns.uk> - 2024-07-31 21:30 +0100
        Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-08-01 13:12 +0100
      Re: Strange PC Video Fault VanguardLH <V@nguard.LH> - 2024-07-31 16:01 -0500
        Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-08-01 13:33 +0100
      Re: Strange PC Video Fault Paul <nospam@needed.invalid> - 2024-07-31 22:29 -0400
        Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-08-01 14:30 +0100
          Re: Strange PC Video Fault Folderol <general@musically.me.uk> - 2024-08-01 14:35 +0100
            Re: Strange PC Video Fault Paul <nospam@needed.invalid> - 2024-08-01 14:33 -0400
              Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-08-02 00:21 +0100
                Re: Strange PC Video Fault NY <me@privacy.net> - 2024-08-02 15:01 +0100
                Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-08-06 23:06 +0100
                Re: Strange PC Video Fault Paul <nospam@needed.invalid> - 2024-08-06 19:05 -0400
                Re: Strange PC Video Fault NY <me@privacy.net> - 2024-08-09 22:40 +0100
                Re: Strange PC Video Fault Java Jive <java@evij.com.invalid> - 2024-08-07 11:21 +0100
                Re: Strange PC Video Fault Paul <nospam@needed.invalid> - 2024-08-07 19:20 -0400

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