LED TV Power Supply Switching & Feedback Circuit በአማርኛ Part 2

we break down the LED TV power supply unit (PSU) with a complete circuit diagram explanation. Learn how AC voltage converts to DC, how the PWM IC drives the MOSFET to switch transformer coils, and how secondary output voltages (12V, 5V, 24V) are generated and filtered using Schottky diodes and capacitors. We also dive deep into the power supply feedback circuit using the TL431 precision shunt regulator and PC817 optocoupler to ensure stable output voltages and prevent voltage drop under load. In this video, you will learn: Primary vs. Secondary section breakdown (Hot ground vs. Cold ground) How PWM IC and MOSFET switching work together Startup resistors and auxiliary winding VCC supply Secondary rectification and filtering (Schottky diodes & capacitors) How the feedback loop works using TL431 reference IC and PC817 optocoupler 00:00 - Introduction & Recap of AC to DC Conversion 00:25 - Overview of the Power Supply Unit (PSU) Circuit 01:36 - Hot Ground vs. Cold Ground Explained 01:54 - MOSFET Switching & PWM IC Driver Overview 03:07 - Chopper Transformer Operation & Magnetic Induction 04:47 - PWM IC Startup Resistors & Auxiliary VCC Supply 07:11 - Secondary Rectification, Schottky Diodes & Filtering 08:26 - Why the Feedback Circuit is Necessary 09:53 - Detailed Breakdown of Feedback Circuit Operation 11:42 - Optocoupler (PC817) Internal Working Principle 14:01 - TL431 Shunt Regulator & Voltage Divider Setup 16:25 - Complete Feedback Loop Summary & Conclusion #LEDTVrepair course, #LEd TV power supply repair, #SMPSrepair tutorial, #PWM IC, #MOSFET switching circuit, #Optocoupler #PC817 test, TL431 reference IC, #Chopper transformer, #TV power section schematic, #የቲቪ ጥገና ትምህርት በአማርኛ, #Yonsat Tech.