Amiga 600 burned, connected 12V to 5V input

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spcbm

spcbm

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Purchased this A600 and it was working. PCB is Rev. 2D, needed a recapping but decided to do it later.

I was wiring a PC power supply to use with it and swapped the 5V and 12V lines, obviously black screen and burning smell !!!!!
It was connected 5-10 seconds, but now I only get a black screen.

Tested the PCB, no activity in data or address lines, only the clock signal. The CPU was HOT but still can be touched for a while, so I decided to replace it with a MC68000F from Aliexpress. No change, the same.

I made then the recaping to see if this could be the problem, but no luck. Tested the data and address lines for a short to GND but all seems OK. I can not see any burned part. The 5V arrive to the PCB, tested on some ICs.

I have little experience with Amigas, appart from recapping, but in C64 is very common that overvoltage kills the RAM first. This PCB is equipped with 2 RAM chips U16 and U17, could be a good idea to change this?

Any help will be appreciated.
 
I had a faulty AT power supply. Saw a flash. Ended up tearing through the 5V line/trace at the back. Some decent gauge copper patch wire fixed the broken trace.

Are you getting any voltage/checked the lines on the back of the motherboard?
 
I have no good news for you - most likely most of IC's (if not all) are gone...
It's better to buy another 100% working A600 mainboard.
If the mouse or FDD were connected during this accident - check them on another Amiga. They can be dead as well.
 
3246251196 said:
I had a faulty AT power supply. Saw a flash. Ended up tearing through the 5V line/trace at the back. Some decent gauge copper patch wire fixed the broken trace.

Are you getting any voltage/checked the lines on the back of the motherboard?
Click to expand...
Checked the 5V on some of the ICs and it was OK.
 
stachu100 said:
I have no good news for you - most likely most of IC's (if not all) are gone...
It's better to buy another 100% working A600 mainboard.
If the mouse or FDD were connected during this accident - check them on another Amiga. They can be dead as well.
Click to expand...
Ok, that's was my thought also :cry:
:cry:
 
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