VOGONS


First post, by jarreboum

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I have some problems with an IBM EGA video card.
Here's the checkit log.

I believe some ram chips are dead. But how do I know which ones? And where to find them on the card?

=== VIDEO RAM TEST === […]
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=== VIDEO RAM TEST ===

Test Results:
Video Memory................................................FAILED ***
ERROR at Address 0A0000h, Bits .E..BA.8...43210 Parity
ERROR at Address 0A0002h, Bits FEDCBA98.6...2..
ERROR at Address 0A0004h, Bits .E.....8765....0
ERROR at Address 0A0006h, Bits FEDCBA.87...3.1. Parity
ERROR at Address 0A0008h, Bits FE..BA9876.43.10
ERROR at Address 0A000Ah, Bits ..DC.A98.654.2.. Parity
ERROR at Address 0A000Ch, Bits ........76543210
ERROR at Address 0A000Eh, Bits .E.CBA..76.43..0 Parity
ERROR at Address 0A0010h, Bits ..DCBA9.76543.10 Parity
ERROR at Address 0A0012h, Bits F..CBA9.76.43210 Parity
ERROR at Address 0A0014h, Bits .EDCBA9876543210 Parity
ERROR at Address 0A0016h, Bits ...C.A987654.21.
ERROR at Address 0A0018h, Bits FEDCBA987654321. Parity
ERROR at Address 0A001Ah, Bits F..C.A9.7...32.0
ERROR at Address 0A001Ch, Bits FE.CB...765.3210 Parity
ERROR at Address 0A001Eh, Bits .EDC.A..76543210

Video Page Test (8 Pages)...................................FAILED ***
ERROR at Video Page #7, Row 1, Column 2 FAILED.

*** END TESTS: 17 ERRORS ENCOUNTERED ***

Reply 1 of 3, by Warlord

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never read about anyway to tell which chips are bad. only suggestion I've ever received was replace all of them or replace some of them and test.

Reply 2 of 3, by Miphee

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Measuring voltages on the I/O pins and comparing them to each other often helps. Worked multiple times on Trident and CL VGA cards.

Reply 3 of 3, by aaronkatrini

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stupid suggestion:
Maybe the bad ram chips overheats?
With a cotton swab with alcohol on it, try poking the ram chips one by one when the card is plugged in, if one of the bad ram chips overheats you can tell because which one because the alcohol would evaporate faster on the bad chip...