[Video]MR25 Burned PCB Inspection and Maintenance
Most MR25 PCB (transistor and MOSFET) are burned due to short circuit caused by some dust particles stick to PCB. So here is video to show you how to test and check the burned PCB and how the repair works.
First of all, you must check whether there is insulating painting on PCB. Must wipe and clean the insulating painting off with isoamyl acetate (commonly known as Banana Oil) before soldering/desoldering and replacement works.