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Old 15 February 2007, 22:05   #1
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Diagnose faulty chip ram IC's

As per title, does anyone know how to narrow down faulty chip rams to specific ic's

e.g. you have quite a few 256k ic's soldered in your bog standard A500, its giving a green screen, how do you know which specific chips to replace?

I tried touching the chips and seeing if any get hot after a few minutes (an internal short circuit) but none of them get hot.

Would be grateful for any info anyone has on this.
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Old 15 February 2007, 23:44   #2
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You could try bending the legs of a working spare chip together a bit and then piggybacking it on the chips one by one.

However this will not work if the broken chip has a bit stuck high or low.
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