Dodgy Amiga 1200 hardware

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  • Greetings everyone,


    This may be somewhat off-topic, but I figured I'd ask anyway.

    I have an Amiga 1200 by Escom (from Amiga Magic German bundle, board revision 1D).


    I have this disturbing hardware problem with the Amiga randomly GURUing and sometimes rebooting. This happens with no additional hardware installed, just the HDD.

    Tried a couple different PSUs to no avail.

    The problem can be almost certainly reproduced by soft-resetting the Amiga and getting to the configuration screen (with boot order and stuff) - and in the menus there, instead of names of boot devices - garbage appears, as if there's some memory corruption happening.


    I know, that sounds very much like bad capacitors, but when I've de-soldered all the electrolytic ones, their capacitance measures within the margin of error from their stated value. Could they have still gone bad? I've already ordered a replacement kit, will see if it solves it.


    What could be other causes for that? Bad RAM(is there a reliable way to test chip ram?), CPU cache, custom chips? Will my newly-ordered ACA1233n help me with that somehow?

  • Have you checked that all the chips, if socketed, are all firmly in place? Have you tried SysInfo to look at the system? Perhaps you have a flaky custom chip....the accelerator won't help video output...

  • Take a pic of the "garbage" - that should give us a lot more info than any description you can think of. I have an idea or two, but would like to confirm with what you see in case of a crash.

  • Have you checked that all the chips, if socketed, are all firmly in place? Have you tried SysInfo to look at the system? Perhaps you have a flaky custom chip....the accelerator won't help video output...

    All custom chips on the A1200 are soldered. No, haven't tried SysInfo yet, as I didn't have any options of transferring files to Amiga from PC at the time. Now I do, but have to wait for the caps..

  • Sad news - recapping did not help :( But now I know, that the problem appears when the Amiga has been working for some time and heated up. The longer it's up - the worse. Starts from random software errors, then at some point begins cyclically rebooting after GURUs (random errors like 8000 0004, 8000 000C). And garbage in the early startup screen. Should I replace Chip RAM, maybe?



    some screen pics:

    https://www.dropbox.com/s/ah5cy3rhtl...94517.jpg?dl=0

    https://www.dropbox.com/s/2suju7zy29...95616.jpg?dl=0

    https://www.dropbox.com/s/45z47kwgii...01333.jpg?dl=0

    https://www.dropbox.com/s/rh98rt5wrp...01425.jpg?dl=0

  • if its heat related it could be a poor joint on "something" "somewhere" on the board, id start re-flowing Alice first as she gets the hottest on a general run and test and just continue chip by chip up the board.