Fixing a faulty Lenovo USB charger

Repairing a USB phone charger from Lenovo. How to test components in a switching power supply and find the failure. Sometimes the problem can be a bad solder joint instead of a faulty component. The Fnirsi FNB58 USB tester: https://www.fnirsi.com/products/fnb58... Please support this channel on Patreon:   / diodegonewild   Instagram:   / savage_danyk