NiCAD Battery Charger

Thread Starter

beatsal

Joined Jan 21, 2018
79
I have a 18VDC Charger which is showing 5VDC, hence not charging the battery. It is a Sears Craftsman. Any help appreciated.
 

Dodgydave

Joined Jun 22, 2012
8,684
That's a switchmode type psu, it could be a regulator Tl431 or caps gone faulty..
Have you got a dvm to check out the supplies, are you familiar with switchmode types?

Take pics of the trackside and a better picture of the inside.
 

Dodgydave

Joined Jun 22, 2012
8,684
Looks like an Hltek Microcontroller on the trackside...also a Brown solder mark near the Hltek chip probably a resistor.
 
Last edited:

Thread Starter

beatsal

Joined Jan 21, 2018
79
So what could have failed? Not familiar with SMPS, but wonder if the open circuit voltage (without battery connected), I measured i.e. 5VDC is indicative of a failure?
 
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