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Old 20 July 2020, 02:12   #1
retrofriends
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Amiga CD32 will not boot. Green screen power light blinks, later a black screen

Hello there. Looking for some help with a CD32. What I have discovered and what I have done:
It came to me with a green screen that would show itself for 10 blinks of the power LED, then the unit resets and repeats the green screen / power blink.
It supposedly came from a person who replaced the processor. After thorough examination, I found the processor was not the part changed, it was AKIKO. I decided to test chip ram with my oscilloscope, and found that the first RAM chip (U16) had no CAS signal, yet the others were fine (U17-U19). So I traced it to a broken trace under the AKIKO chip. I installed a bodge wire to repair this. (Hopefully this portion of the repair will be helpful if someone else gets a green screen / light blink on their CD32).

Now the unit boots to a black screen. I am assuming that it is booting past the chipmem check. The power LED is dim for a second then goes bright, which I assume to be correct operation. I have examined the large capacitors. They are the correct orientation, and seem to be taller than the factory ones, so I am assuming someone did a recap already (likely done before trying the AKIKO replacement).

Any suggestions would be appreciated. I have tested continuity on AKIKO's pins to the pads and all is good. I will try continuity from AKIKO to other points/chips in case there are more broken traces to AKIKO.

I have a DiagROM for CD32 on the way. Anyone had experience with this application? I usually use the serial output, but the CD32 doesn't have a port. I know it has serial in the keyboard/aux port, and another in the expansion connector, but they are TTL. Has anyone tried a TTL-to-USB converter to connect it to a PC? Which port does the DiagROM output to, the keyboard/aux or the rear expansion?
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Old 23 July 2020, 22:35   #2
retrofriends
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Problem solved. I found a second bad trace on a data line from AKIKO. Another Amiga brought back from the grave!

Video of my repair here:
[ Show youtube player ]
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Old 24 July 2020, 19:40   #3
Akiko
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A great job reviving it so far, looking forward to part two.
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