Toshiba Tecra 4000CDT - strange graphics glitches in DOS & Windows \ VOGONS

Toshiba Tecra 4000CDT - strange graphics glitches in DOS & Windows

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First post, by xnplater

Posted on 2025-09-09, 15:41

xnplater Offline

Rank Newbie

Rank: Newbie
Posts: 32
Joined: 2024-11-22, 20:48

I have purchased a Toshiba Tecra 4000CDT. The laptop is very nicely preserved outside, haven't yet checked inside (will do soon to remove / remedy any potential CMOS battery leakage).

However, on booting the laptop, I found it has some graphics glitches, that appear mostly in DOS. Despite what the second image below suggests, the glitches can spread throughout the whole screen.

What could this be? Faulty Video Memory? Something else / ideas?

The attachment IMG_20250909_172857.jpg is no longer available

The attachment IMG_20250909_172922.jpg is no longer available

Reply 1 of 1, by xnplater

Posted on 2025-09-13, 20:33

xnplater Offline

Rank Newbie

Rank: Newbie
Posts: 32
Joined: 2024-11-22, 20:48

I have determined the cause of the graphics glitch to be faulty VRAM, bit 3 is stuck on many locations.

The attachment IMG20250913222033.jpg is no longer available

I will have to get a spare CPU module, because the video chip and video memory is on the CPU module. I don't think I can solve this by re-soldering/re-seating.

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