Very cyan image over VGA \ VOGONS

Very cyan image over VGA

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First post, by Almoststew1990

Posted on 2021-11-24, 18:50

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My video card does a very cyan image over DVI to VGA adapter. The pure blue of the XP formatting screen is fine, white text during post is pure cyan, black text is pure black, red is black. Does this mean that that red pin of the VGA out is not connecting properly?

DVI video out is fine.

Weirdly the other DVI port outputs white text as yellow, etc. Something fishy going on.

The cable and adapter are both fine, and the connection to the monitor.

Reply 1 of 9, by keenmaster486

Posted on 2021-11-24, 19:06

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I would suspect your adapter.

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Reply 2 of 9, by dormcat

Posted on 2021-11-24, 20:50

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Got a very similar problem on my Asus V9560XT/TD/128M (GeForce FX 5600 XT): DVI output is fine, but the VGA output has a strong cyan tint. Doesn't really matter as long as DVI is working fine though.

Reply 3 of 9, by weedeewee

Posted on 2021-11-24, 21:04

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DVI-VGA adapters tend to be passive, if the red pin on one port is faulty(bad contact) and the blue pin on the other, you will get the kind of behaviour you describe.

Right to repair is fundamental. You own it, you're allowed to fix it.
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Reply 4 of 9, by Jager

Posted on 2021-11-24, 21:29

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Either bad contact or one of the capacitors or protection diode is shorted to ground. You can check resistance on the red channel to ground, it should be around 75 Ohm.

Reply 5 of 9, by Doornkaat

Posted on 2021-11-24, 21:32

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I suspect there is an inductor missing close to the DVI port that carries one of the analogue colour signals.

Reply 6 of 9, by kixs

Posted on 2021-11-24, 21:32

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I have the same problem on 6800GT. Screen is all green on VGA out (BIOS, Windows). DVI is fine. I'll check the resistance...

Requests are also possible... /msg kixs

Reply 7 of 9, by pentiumspeed

Posted on 2021-11-25, 01:07

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Examine your card very carefully near the DVI connector, one of component got knocked off.

Common on my video cards that was advertised as needs repair from ebay, since I knew how to repair, that saved some money and fun.

Cheers,

Great Northern aka Canada.

Reply 8 of 9, by kixs

Posted on 2021-11-25, 22:35

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pentiumspeed wrote on 2021-11-25, 01:07:

Examine your card very carefully near the DVI connector, one of component got knocked off.

Common on my video cards that was advertised as needs repair from ebay, since I knew how to repair, that saved some money and fun.

Cheers,

Just took a hard look on the back side near the VGA connector and it seems at least two smd's got knocked off. Now I know where the problem lies. Thanks for the hint 😉

Requests are also possible... /msg kixs

Reply 9 of 9, by vstrakh

Posted on 2021-11-26, 10:45

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Lucky you.
I have S3 Trio64v2 that has blue output shorted to the ground. I was hoping that's some external components, but after removing everything (inductor, 75 Ohm resistor, etc) the pin on the chip itself measures 12 Ohm to the ground.

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