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07 November 2011, 12:16
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#1 |
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Registered User
Join Date: May 2004
Location: UK
Posts: 262
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A1200 Graphics Corruption
I have been having a problem with one of my A1200 motherboards intermittently, however it now seems to be a permanent problem. The graphics appear corrupted, lines will appear on the screen and colours are not correct as can be seen in the attached photo. This happens in Workbench and in games. I have tried it without any additional hardware attached and the problem still persists.
What are your thoughts folks? I'm thinking it could be a capacitor issue, but thought I'd get some opinions before I embark on a replacement project. |
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07 November 2011, 12:23
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#2 |
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Registered User
Join Date: Sep 2009
Location: Norway
Posts: 1,711
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Cuold be some bad blocks in the chip RAM areas where the pixel data and palette is stored...
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07 November 2011, 12:24
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#3 |
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Registered User
Join Date: Jul 2007
Location: Poland
Posts: 433
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Did you try all video outputs (TV, composite, RGB)?
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07 November 2011, 13:27
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#4 |
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Registered User
Join Date: Mar 2011
Location: Sarajevo, Bosnia-Herzegovina
Posts: 52
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I've been having similar problem with my A1200 composite output only. Unfortunately, I have not been able to identify the problem. Here is my thread:
http://eab.abime.net/showthread.php?t=61409 |
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07 November 2011, 14:20
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#5 |
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PSPUAE DEV
Join Date: Nov 2006
Location: Wales / UK
Age: 45
Posts: 6,007
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What happens if you push firmly on lisa?
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07 November 2011, 15:35
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#6 |
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Registered User
Join Date: May 2004
Location: UK
Posts: 262
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The graphics corruption is happening on both composite and RGB, even through Indivision VGA when it was plugged into this machine. I checked the ROMs and one did seem a bit loose so I reseated them both firmly.
On first boot after reseating the graphics corruption was still there but then disappeared after a warm reset. Even after multiple cold boots I have not had another occurrance. Strange and random behaviour. I'll wait for the problem to return and see if I can perform more tests then. |
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07 November 2011, 16:26
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#7 |
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Registered User
Join Date: May 2004
Location: UK
Posts: 262
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After leaving it for a couple of hours the problem is back, and pushing very firmly on Lisa does get rid of the problem. Good call FOL!
So, what's the permanent fix for this? |
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07 November 2011, 17:16
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#8 |
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Needs a life
Join Date: Jan 2008
Location: England
Posts: 1,707
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Pushing permanently on Lisa?
 Sounds like you need to reflow the connections on lisa... |
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07 November 2011, 17:18
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#9 | |
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PSPUAE DEV
Join Date: Nov 2006
Location: Wales / UK
Age: 45
Posts: 6,007
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Quote:
Best to resolder it completely. |
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07 November 2011, 17:57
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#10 |
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Registered User
Join Date: May 2004
Location: UK
Posts: 262
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Hmmm, well that sounds like a fun little project. I'm not sure if that might be a little out of my league or not. I've done my fair share of console mod chip installs and some minor Amiga motherboard fixes, but resoldering a key chip sounds a bit hairy to me!
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07 November 2011, 18:10
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#11 | |
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PSPUAE DEV
Join Date: Nov 2006
Location: Wales / UK
Age: 45
Posts: 6,007
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Quote:
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