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Today, 19:09
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#1 |
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Registered User
Join Date: Jul 2022
Location: Berlin
Posts: 31
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Yellow screen with 1MB chip memory
I have an A600 which shows me a yellow screen on boot with the 1MB chip memory expansion in. When I remove it, the computer boots and works just fine.
Is there any way to find out, which chip could be faulty, other than desoldering them one by one and checking them in a tester? |
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Today, 19:20
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#2 |
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Registered User
Join Date: Jan 2016
Location: Germany
Posts: 369
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Could be as well a bad connection, clean the contacts (both the mainboard and the expansion) with a soft pencil eraser and IPA after ... then reseat the expansion and be sure to pull it backwards a tiny little bit after that
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Today, 19:23
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#3 |
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Registered User
Join Date: Jul 2022
Location: Berlin
Posts: 31
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I've already cleaned it.
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Today, 19:29
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#4 |
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Registered User
Join Date: Jan 2016
Location: Germany
Posts: 369
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Then maybe try to piggyback the ram with a working IC could be an option to determine the defective one, although that's not always working but it could be a start. Do you happen to have a picture of the expansion ?
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Today, 19:36
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#5 |
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Registered User
Join Date: Jul 2022
Location: Berlin
Posts: 31
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Can I attached images directly?
Hopefully this URL works: https://drive.google.com/open?id=1wv...u&usp=drive_fs Due to the kind of memory ICs, it will be almost impossible to piggy back anything on to them. |
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Today, 19:58
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#6 |
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Registered User
Join Date: Jan 2016
Location: Germany
Posts: 369
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Sorry, don´t have permission to that files (google says) ... don´t think you can attach anything here, but you can use https://eab.abime.net/zone.php? to upload a ZIP file perhaps
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Today, 20:02
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#7 |
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Registered User
Join Date: Jul 2022
Location: Berlin
Posts: 31
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I'll try again.
It's those chips with the little legs that are tucked under the body. https://drive.google.com/file/d/1wvE...ew?usp=sharing It says 89X8922 on them. I can't find those ICs for sale anywhere though. |
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Today, 20:17
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#8 |
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Registered User
Join Date: Jan 2016
Location: Germany
Posts: 369
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Nice, that´s the same I got in one of my 600s
But yeah, they are hard to source in that SOJ-26 package format ... have you already tried to bridge the switch ? That was giving me a hard time while restoring mine ! And also be sure (mentioned that above) after installing it, pull it back a bit (maybe 2 to 3mm). Mine would not make good contact, even that I cleaned everything (more than once) If that's not the fault and you really want those chips for testing, look for some 1MB Simms on EBay, sometimes they have such chips on there
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Today, 20:20
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#9 |
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Registered User
Join Date: Jul 2022
Location: Berlin
Posts: 31
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Actually, what's the purpose of that switch? I assumed it has something to do with the clock IC, but maybe not?
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Today, 20:28
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#10 | |
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Registered User
Join Date: Jan 2016
Location: Germany
Posts: 369
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Quote:
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