Intel486dx33 wrote on 2020-01-25, 00:25:
Well, I added the capacitor but it did nothing.
Any Ideas ?
Did you try the things suggested earlier?
First off, I'd remove the cap you added because this layout of the board likely wasn't meant to have one there, which is why it was left off.
Check for any damage to the tiny surface mount ceramic caps and resistors. Look for any scratches and follow them to see if they lead to a damaged trace or damaged component.
Clean the PCI contacts vigorously with a pencil eraser and check them for any gouges or deep scratches. Don't be afraid to reinsert the card a dozen times (even inserting with more or less force, or unevenly...) just in case it is a contact issue. These are more common with AGP cards but it can happen with PCI too, even if the connector looks fine at first glance.
Check for any loose surface mount components. I usually use a finger so I can feel if any move or have sharp\broken edges that I couldn't see. I've caught a lot of cracked ceramic caps this way.
Dust the surface of the card with a soft brush, front and back to be sure that any unseen conductive debris is removed (I've seen this fix a dead card probably 20% of the time... which is crazy if you think about how easy a fix this is).
If none of this works, try applying some pressure to the heatsink (even just pinch the card in your fingers) while powering the system on to see if makes any difference... try it a few times. Do the same with the RAM chips.
These are all the non-invasive things I do to diagnose a dead card. None of it is technical, but I "fix" a lot of stuff this way.
After this I would maybe test the voltage regulator if you know how to do that (I personally don't know a lot about this, so I'd have to do a bit of research before I started probing around while the card was powered).
Last resort would be reflowing the chip or replacing all of the caps.
Now for some blitting from the back buffer.