Why does the VGA output appear like this on my TNT2? \ VOGONS

Why does the VGA output appear like this on my TNT2?

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First post, by Kahenraz

Posted on 2026-08-17, 14:10

Kahenraz Offline

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This TNT2 I have smears dark colors into light colors horizontally. Why might this happen? Is it old capacitors or something deeper that's not worth shooting.

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Reply 1 of 5, by Trashbytes

Posted on 2026-08-17, 14:13

Trashbytes Offline

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Could be Vbios bit rot that has corrupted the palette tables.

Id look at flashing a new bios over and checking the integrity of the Vbios chip itself.

Outside of that it could be a resistor/cap on the VGA output side that is going out of spec too, might be worth checking them.

Reply 2 of 5, by Kahenraz

Posted on 2026-08-17, 22:30

Kahenraz Offline

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It's definitely a smear, so it feels like something in the analog circuit rather than the VBIOS.

Reply 3 of 5, by jmarsh

Posted on 2026-08-17, 23:18

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Are you sure it's not the monitor?

Reply 4 of 5, by Kahenraz

Posted on 2026-08-17, 23:34

Kahenraz Offline

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Yes, I'm positive.

Reply 5 of 5, by maxtherabbit

Posted on 2026-08-17, 23:48

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check all the passives on the color lines upstream of the vga connector

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