Laptop power supply with PFC - teardown and repair (BOOM!)

Today, I tried to fix a 20V 6.75A 135W laptop switching power supply with an active PFC. This time it didn't go well. But at least, you can see what's inside. I explain how does an active PFC (Power Factor Correction) and a synchronously rectified flyback work. I also show how to test a MOSFET, diodes and a bridge rectifier. I show a simplified schematic and locate the important components on the board.

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• #science_technology
• #laptop
• #switching
• #power_supply
• #teardown
• #repair
• #schematic
• #pfc
• #flyback
• #synchronous_rectifier