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Help! Game Board Repair (Super Pang)
CHRIS-F:
Looking quickly over the board each of the quad op amps of the LM324A has a 10uf cap and a small ceramic blue cap marked 104, it looks like someone has worked on it before, 3 of the 10uf caps are smaller and one bigger, one of the blue caps has been replaced with a brown substitute which is labelled 102 which I assume is ok but the cap at C11 looks a little suspect to me it looks like it reads 422 and it had a strange white coating on it I only saw the value when I scraped it off, anyone else have the same bootleg board and can confirm this cap is right or it should be a 104/102? also most of the caps on this board are 10uf but the very bottom left cap is 100uf again is that correct?
Thanks,
Chris.
Titchgamer:
Ile have a look at mine tonight when I get home if nobody else gets back to you.
Titchgamer:
Ok so my cap at C 11 is a 682k
And I dont have a cap at all at C 19
Hope thats some help!
CHRIS-F:
--- Quote from: Titchgamer on June 28, 2019, 12:39:04 pm ---Ok so my cap at C 11 is a 682k
And I dont have a cap at all at C 19, Hope thats some.
--- End quote ---
Yeh Thanks, much appreciated :-)
I may have to give up on this board though and buy another :-( I was working in bad lighting last night and I was checking voltage at the pins and I accidentally shorted something, not exactly sure which IC I touched but I think it may have been the 74LS368AN IC :(( all the graphics corrupted on the top half of the screen and it froze, after a power cycle nothing just a white screen and resetting the cpu does nothing, just wondering if it could have killed the CPU or the 368 not really sure where to start looking now.
Any Ideas how to start diagnosing the fault?
I could check for a clock/voltage at the cpu but after that I'm lost.
Thanks.
Titchgamer:
Oh that sucks :(