HOLE IN THE PSU: Fixing a BenQ G2222HDBL
Channel: FFcossag
Date: 30/08/2016

This trash-picked BenQ G2222HDBL monitor would blink its power LED when plugged in. Failure of the LED driver boost circuit caused a short-circuit over the 24 V power rail. The boost converter switching transistor was completely burned out, as well as the rectifier diode.

I reconstructed the circuit from images, and removed all the carbonised, burnt, conductive PCB material from the area and built a new boost circuit using copper wire and off-the-shelf components.

Failure is likely caused by long-term overheating issues; the boost converter switching transistor is not properly heatsunk.
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