Which card exactly? My Trident VLB card has a jumper for monitors above and below 48 kHz. You need to set that correctly.

Cga.8086 wrote:

I was given an old Trident Vesa Local bus videocard
when i boot using different monitors and different motherboards, the only thing i see is a mesage saying OUT OF SCAN RANGE

Sounds like monitor issues to me. Are you using modern LCD/TFT (flatsctreen) monitors?
The out of range, is why I can't use most flatscreen monitors on my Amiga scandoubler. The output is a 50hz signal.

I have gotten that with VLB cards when they're not making good contact with the slots on the motherboard - clean both the contacts on the card and the pins on the slots with alcohol and test several times. Also check the card PCB under a strong light and magnifying glass to see if there are any severed traces.

Cga.8086 wrote:

I was given an old Trident Vesa Local bus videocard
when i boot using different monitors and different motherboards, the only thing i see is a mesage saying OUT OF SCAN RANGE.

Do you have any other monitors you could try? CRT if possible.
Older cards often used a wide range of refresh rates that LCD monitor can't handle.

i did clean the contacts with an eraser, but no luck

and i tried the card on 2 monitors, one was crt and anotherone Lcd
and 2 motherboards.

i can´t figure out why, maybe the gpu is dead, its a trident vesa card.

Cga.8086 wrote:

i did clean the contacts with an eraser, but no luck […]
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i did clean the contacts with an eraser, but no luck

and i tried the card on 2 monitors, one was crt and anotherone Lcd
and 2 motherboards.

i can´t figure out why, maybe the gpu is dead, its a trident vesa card.

That doesn't sound good. Did you get any visible output at all on the CRT?

nothing on crt i got a blue message saying out of scan range.
i don´t think its the memory, maybe its fault on the gpu chip?

Does the card have jumpers? Some cards from the same era had some output related jumpers on them.

derSammler wrote:

Which card exactly? My Trident VLB card has a jumper for monitors above and below 48 kHz. You need to set that correctly.

😉

I had this problem with a PCI video card i bought off ebay not working. Problem ended up being the 14.31818 Mhz Crystal. Soldered one in from a doner card and solved the issue

^A clocking issue. Reminds me of http://www.os2museum.com/wp/the-isa-osc-mystery/

Personally, I often do my experiments with LCD/TFT VGA "monitors" that come with an additional Composite input.

That way, I make sure that they can handle 15KHz and/or other weird timings.

Likewise, LCD/TFT TVs with VGA are interesting.
They are more flexible in most situations.

A real CRT VGA monitor is best, of course.
It can handle various resolutions "natively".
"Natively" because it technically also has a native resolution, based on dot-pitch, screen mask and so on.

By comparison, a monochrome CRT monitor comes closer to not having a native resolution due to the absence of a screen mask.

Hmm an interesting read, definitely something to keep in mind if we experience these issues in the future. I had tried various LCD and CRT monitors on the card i was speaking of. Unfortunately don’t own an oscilloscope nor used one. Just done the old trial and error when I has some spare time - started with the electrolytic capacitors which tested fine after 25 years. Then moved on to the crystal oscillator mainly due to how easy it was to swap and knew it had something to do with frequencies. Was pretty happy to bring something dead back to life