Check the tantalum capacitors for shorts. I bet you find one that’s taking a 5v or 12v power line to ground

Re-set the Bios
Re-set the memory chips
Use multimeter to check the continuity in the tantalum capacitors
Clean the edge conector
check for bent pins ont the grapfic chip

I would reseat the BIOS a few times, take out the extra RAM chips temporarily.

It's always a good idea to remove the BIOS chip, and try to read it in a programmer...
- if it reads, store the copy in a safe place - preferably let the entire world backup it for you 🤣
- if it doesn't, search for a copy...

Thank you for all your good advice. Does anybody know which BIOS-chip is used on this card, so I can read it on my programmer? And where I can find the BIOS-file?

egbertjan wrote on 2025-11-11, 14:43:

Thank you for all your good advice. Does anybody know which BIOS-chip is used on this card, so I can read it on my programmer? And where I can find the BIOS-file?

Don't know it by heart, but reading a normal 64k or 32k 27C512 or 27c256 series eprom will work just fune.

a bios file to compare against is available on theretroweb https://theretroweb.com/expansioncards/s/diam … tar-64-isa#bios
though if your version is a different version then comparing it won't be very helpful.

You say you do not get signal but you fail to mention if you can see/hear if your computer still boots.

weedeewee wrote on 2025-11-11, 14:52:

You say you do not get signal but you fail to mention if you can see/hear if your computer still boots.

Or if the power supply fan spins.

If the power supply fan doesn't spin with the card in the system, then there's likely a tantalum capacitor short
If the mobo BIOS gives beep codes saying no VGA card, then the EEPROM rot is a likely culprit
If numlock light still works and you see floppy or storage activity, then I'd look at the card memory

I tried the card on two different motherboards. There comes no post and the system doesn't boot and nothing to see on the monitor. I replaced the Speedstar with another videocard in the same slot. With both motherboards came a post and a correct boot. I also tested the card after removing two of the memorychips.

egbertjan wrote on 2025-11-11, 18:16:

I tried the card on two different motherboards. There comes no post and the system doesn't boot and nothing to see on the monitor. I replaced the Speedstar with another videocard in the same slot. With both motherboards came a post and a correct boot. I also tested the card after removing two of the memorychips.

douglar wrote on 2025-11-11, 15:19:

Or if the power supply fan spins.

If the power supply fan doesn't spin with the card in the system, then there's likely a tantalum capacitor short

Have you verified this ?

The power supply fan spins when the card is in

It might also have something to do with the jumpers on the card. What's the best way to set the jumpers? I'm testing the card on a Pentium 60MHz board with socket 4.

egbertjan wrote on 2025-11-11, 19:09:

It might also have something to do with the jumpers on the card. What's the best way to set the jumpers? I'm testing the card on a Pentium 60MHz board with socket 4.

The retro web entry has some documentation on the jumpers, though the identifications aren't the same, the positions seems to line up.
JP7 might be for using interrupt 2/9 or not
JP8 might be for 0 waitstates or not.
closed or open.
I doubt any of those jumpers will make a difference, though feel free to try.

out of curiosity, what markings are on the transistor right next to the label CR1, halfway in between D1 & C25 ?

Have you managed to read out the bios ?

weedeewee wrote on 2025-11-11, 19:37:

The retro web entry has some documentation on the jumpers, though the identifications aren't the same, the positions seems to li […]
Show full quote

egbertjan wrote on 2025-11-11, 19:09:

It might also have something to do with the jumpers on the card. What's the best way to set the jumpers? I'm testing the card on a Pentium 60MHz board with socket 4.

The retro web entry has some documentation on the jumpers, though the identifications aren't the same, the positions seems to line up.
JP7 might be for using interrupt 2/9 or not
JP8 might be for 0 waitstates or not.
closed or open.
I doubt any of those jumpers will make a difference, though feel free to try.

out of curiosity, what markings are on the transistor right next to the label CR1, halfway in between D1 & C25 ?

Have you managed to read out the bios ?

Can you read the values ​​of the transistor on this picture of the card?

egbertjan wrote on 2025-11-11, 19:51:

Can you read the values ​​of the transistor on this picture of the card? […]
Show full quote

weedeewee wrote on 2025-11-11, 19:37:

The retro web entry has some documentation on the jumpers, though the identifications aren't the same, the positions seems to li […]
Show full quote

egbertjan wrote on 2025-11-11, 19:09:

It might also have something to do with the jumpers on the card. What's the best way to set the jumpers? I'm testing the card on a Pentium 60MHz board with socket 4.

The retro web entry has some documentation on the jumpers, though the identifications aren't the same, the positions seems to line up.
JP7 might be for using interrupt 2/9 or not
JP8 might be for 0 waitstates or not.
closed or open.
I doubt any of those jumpers will make a difference, though feel free to try.

out of curiosity, what markings are on the transistor right next to the label CR1, halfway in between D1 & C25 ?

Have you managed to read out the bios ?

Can you read the values ​​of the transistor on this picture of the card?

The attachment 20251111_204802.jpg is no longer available

The attachment 20251111_205311.jpg is no longer available

Yes, Thanks.
I was wondering if it was some LDO voltage regulator.

ST LM334 L705 - Three Terminal Adjustable Current Source . 😐 no idea.

Any chance of getting a resistance measurment between GND&+5V, GND & +12V & (GND & -5v & GND & -12v if in use) ?

edit: if i'm counting correctly from the back of the card, only +5v is in use.

LM334 is the analog circuit voltage regulator

Do both motherboards beep without a VGA card inserted?
If you take out the BIOS and two extra memory chips from the VGA card, does it beep?
Does it it beep after reinserting the BIOS?

Metal oxide build up on insertable chips is real

nuno14272 wrote on 2025-11-11, 09:09:

Re-set the Bios Re-set the memory chips Use multimeter to check the continuity in the tantalum capacitors Clean the edge conecto […]
Show full quote

Re-set the Bios
Re-set the memory chips
Use multimeter to check the continuity in the tantalum capacitors
Clean the edge conector
check for bent pins ont the grapfic chip

What do you mean with continuity in de capacitors? I have a multimeter but I don't how to use it to check the capacitors.
With what kind of material do you clean the connector? Can I use alcoholpads?

If no boot, and no beeps, the card is causing a short...
If bios problems the cpu would post , no video on screen but post.

so its a short problem.. need to check continuity in those tantaluns, and that diode