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03 March 2015, 20:46
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#1 |
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Registered User
Join Date: Feb 2012
Location: Veendam, Netherlands
Age: 47
Posts: 53
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Amiga 500 green screen & constant rebooting
Got my old Amiga 500 out of the closet to see if it was just working.
Sadly not, I hooked it on a Amiga 600 power supply (maybe thats! the issue???) and I got a green screen with flickering fdd & power leds, then rebooting and doing it all over again. I have opened it up, but I cannot see any visual damage by leaking capacitors. And the AGNUS chip is still firmly in place. I removed the A501 1/2MB expansion card to see if it had any affect, but sadly not. Revision is 8A.     
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03 March 2015, 20:49
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#2 |
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Registered User
Join Date: Sep 2006
Location: Thunder Bay, Canada
Posts: 4,323
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Hi,
remove all socketed chips, check for cleanliness and put back in. Remove Agnus and put it back in. (use a proper extractor withe Agnus or you may break the socket |
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03 March 2015, 22:14
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#3 |
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Registered User
Join Date: Apr 2011
Location: birmingham
Age: 55
Posts: 2,827
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try the cias and agnus.
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04 March 2015, 10:06
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#4 | |
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Registered User
Join Date: Aug 2012
Location: Australia
Posts: 651
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Quote:
I would reseat all the ics that are socketed first. Last edited by Jope; 04 March 2015 at 10:18. Reason: Please don't fullquote huge images. |
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04 March 2015, 10:47
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#5 |
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Registered User
Join Date: Apr 2011
Location: birmingham
Age: 55
Posts: 2,827
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actually,i had another look at the pictures...i dont know if its anything to do with your main problem,but im wondering.
if you look just behind the keyboard connector youll see two resistors,one looks a bit burned? or maybe its the light? i dont know. maybe its worth looking at.around that area and what that resistor is connected to. |
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04 March 2015, 11:01
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#6 | |
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Registered User
Join Date: Aug 2012
Location: Australia
Posts: 651
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Quote:
Yea the one on the left looks a bit dodgy.. |
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04 March 2015, 11:26
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#7 |
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Unregistered User
Join Date: Sep 2012
Location: Copenhagen / DK
Age: 43
Posts: 4,190
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A green screen indicates a problem with chip ram usually caused by a problem in either data or address bus paths. The main culprits here are U10-U13, the 6 ICs in the bottom or possibly Gary. Unfortunately only Gary is in a socket, so it would probably take a soldering iron and a replacement IC to fix it.
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04 March 2015, 11:29
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#8 | |
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Registered User
Join Date: Apr 2011
Location: birmingham
Age: 55
Posts: 2,827
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Quote:
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04 March 2015, 12:38
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#9 |
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Amiga Nutter
Join Date: Sep 2005
Location: Paignton, Devon.
Age: 43
Posts: 220
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I had the same issue with mine, as mentioned above it was the RAM, I had expanded an A590 which takes the same 4-bit 256K IC's and I had 4 spare, swapped them around and the machine worked again. There was more than 1 RAM chip faulty I found, if you are good with a soldering iron, its 4 IC's to replace (U23, U22, U21 and U20), they are quite cheap to buy
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04 March 2015, 23:01
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#10 |
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Registered User
Join Date: Feb 2012
Location: Veendam, Netherlands
Age: 47
Posts: 53
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Sadly I am not. :/
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