(Topic ID: 232745)

System 11 - Dead MPU & High Power Supply

By WonderMellon

5 years ago


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#3 5 years ago

Acid above U44, looks like a little above u45. Some below SRC3, and to the right of SRC5. Maybe its just dirt, But L2, looks a little burnt.

#5 5 years ago

Once the battery starts leaking, the corrosion starts. It's not necessarily the battery acid that kills the board, it's the corrosion. I'm not 100% on the chemistry, but corrosion spreads on metal when electricity is passed through it. If it's eaten into the traces around any of the chips, it gets hard to repair. You may not know the extent of the damage till you pull parts.

1 week later
#12 5 years ago

Did you replace the Bridge rectifier? If you haven't, that would be next for me, then IC1, if the transformer on the heat sink you were talking about was Q5, 2n6057.

#14 5 years ago

I will measure when I get home from work

#15 5 years ago

ok,
C is 12v
E is 5.2V
B is 6.5V
You dont have voltage on B, it comes out of IC1, Pin 10. what voltage do you have on pins 10, 11 and 12 of IC1? (measure each pin to ground). Put the newer 2n6057 back in.

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