First post, by Albercik
- Rank
- Newbie
Hello All,
Yesterday, I've built a new 486 PC. I have a bunch of ISA GPU's to be tested and one of them is Trident GPU with Trident TVGA8900C chip.
The card is giving an output to the screen and in DOS everything seems to be fine. Even in Norton Commander (with blue background) the GPU seems to be working fine. But... When running Windows 3.1 - there's snowing and gaussian-like effect (it looks like a low-res photo of a LCD screen,but it's moving) on the screen. When playing eg. Lotus III - there are vertical bars on the screen.
At the beggining I'd thought it's a faulty VGA cable, but I've replaced it still the same issue. Then I've swapped a card's memory taken from another (that's dead), and still nothing. After replacing the card with different GPU - the issue is gone.
Because those card's are quite rare and hard to find (at least here, in Poland) - I'd really love to save as many of them as it's possible.
Any thoughts on what may be causing the issue?
Here's the photo of the same card as mine:
The only difference is that mine has blue capacitors. And this is my first thought - to replace the capacitors, but... I have no idea what are their values (capacity) as they have nothing written on them. I'm guessing - they're tantalum caps, but I'm not sure if I can replace them with an ordinary, electrolythic caps.
Any help will be much appreciated!
[EDIT] Found some markings on the capacitors - the bigger ones are 10u 16V and the smaller ones are 2+2 16V tantalum. Before I'll start playing with soldering iron - can you please confirm if I'm thinking correctly that this issue can be cause by faulty capacitors?
P MMX 166MHz, 64 MB, S3 Trio64V2/DX, SB Vibra 16 ISA, 40GB HDD
P III 650MHz, 640 MB, nVidia Riva TNT2, SB 16 ISA, 120GB HDD
486 DX2 66MHz, 16 MB, Trident TVGA8900C, SB Vibra 16 ISA, 2GB CF