Had a power supply board let out the magic smoke on a 55 inch TV yesterday...
It was a pretty normal repair job, a Samsung with no backlight. I had the back off and was checking the usual caps and fuses. I had my meter on the main filter cap, just checking voltage, and I must have slipped... my probe touched two points it shouldn't have. There was a loud pop and a puff of gray smoke from near the PWM controller chip. My heart just sank. I shut everything down right away. The board had a clear scorch mark on a tiny surface mount resistor now. I spent the next two hours carefully cleaning the area and trying to find a schematic to see what that part even was. It's fixed now, but man, that was a dumb, expensive mistake. Anyone have a good trick for keeping probe tips steady on those tiny board points?