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Old 10-28-2021, 12:26 PM   #6
redwire
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Join Date: Dec 2010
City & State: Alberta
My Country: Canada
Posts: 2,467
Default Re: Duracell Battery Charger - CEF22GBL-3

EM78P37x is Elan Microelectronics 8-bit OTP MCU, I think 4KB ROM for the 374.
It's a MCU custom programmed for this application. You'd have to draw the schematic, I've never seen anything published out of china or taiwan for fear of copying.

There's really no solder on the through-hole pad by R49 to B1N, and bad soldering to big through-hole parts is a common problem to look for.
How are the electrolytic capacitors? It is powered by a wall wart? Wondering if it has the 9V power it needs.
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