In this episode, we repair a fairly efficient switching power supply. We look for damaged elements, and when that doesn't give any results, we connect it and measure the voltages. It turns out that the damage is on the secondary side, and it's quite unusual. You'll find out what caused the power supply not to work by watching the video ;) ----------------------------------Table of contents-------------------- 0:00 Introduction, what's wrong? 1:03 Opening the case, watch out for the capacitor! 2:44 Inside the power supply 4:15 Looking for damaged elements 6:33 Are the electrolytes OK? 7:52 Checking the optocoupler 9:26 Cleaning the board of sediment 10:16 Voltage measurements 13:14 Analysis of the feedback circuit 16:08 Where was the buried dog? 17:57 Will the power supply start? 18:17 Checking current efficiency 19:12 Summary, ending ----------------------------------------------------------- Don't want to miss new videos? Subscribe to the channel! My most interesting videos: Long-range bug: • FM transmitter with a sensitive microphone, plus... Data transmission, multiplexing: • Data transmission over one wire without m... LED bulb repair: • LED bulb repair; How it is built... Good-sounding FM radio: • How to make a simple FM radio with an amplif... Plug-in power supply repair: • Switching-mode power supply repair; How it wor... Simple FM radio: • How to make a simple FM radio? Receiver... Portable regulated power supply: • Reliable regulated power supply with fu... FM transmitter: • Long-range FM transmitter, design... Changing voltage from 24V to 12V in a power supply: • How to change the output voltage in a pow... Simple flyback power supply: • How to build a simple power supply in a topol... Repairing a power supply in which a mosfet blew up: • Repairing a switching power supply in which a... We repair a switching power supply: • Repairing a switching power supply; What's up... Dummy load for testing power supplies: • Dummy load for testing power supplies... Changing the voltage in a switching power supply: • Changing the output voltage in a power supply... Reverse polarity protection: • Protecting systems against reverse polarity... MPPT controller for solar panels: • Solar charger, charge controller... Repairing an energy-saving light bulb: • How to repair an energy-saving light bulb,... We build a switching power supply: • How to build a power supply in the fly topology... Laboratory power supply: • Converting a switching power supply to a la... Repairing a 5V charger: • Repairing a charger, 5V power supply; LCD monitor repair: • How to repair an LCD monitor, what is in it... ATX power supply repair: • How to repair an ATX power supply, what to look for... Battery rectifier: • Automatic rectifier, charger for... Short circuit protection: • Current limiter, overload protection... Step-up/down converter: • Simple and universal control converter... Simple regulated power supply: • Switching power supply conversion to re... 100W converter from 12V to 230 or 325V: • Converter from 12V to 230 or 325V, m... LED oscilloscope: • LED oscilloscope (part 1): introduction... Simple and efficient audio amplifier: • Simple but efficient audio amplifier... Induction heater, high voltages on ZVS: • ZVS circuit, i.e. induction heater... PWM controller for motors and bulbs: • Regulator PWM for Motors and Light Bulbs ... Playlists: Electronics Basics: • Electronics Basics DIY: • DIY Converters: • Converters Repairs: • Repairs