​How to Test China PCB Solar Inverter Microcontroller & Biasing Voltage

​⚡ China Solar Inverter PCB Microcontroller & Biasing Voltage Testing Guide ⚡ ​Is your solar inverter repeatedly blowing IGBTs after replacement? In this video, we cover step-by-step how to properly test a China On-Grid Solar Inverter PCB before installing new IGBTs to prevent damage. ​Learn how to safely measure 2V microcontroller output voltages, test 270R resistors, check Optocoupler pin voltages, and fix common power supply cycling (relay clicking) issues! ​[00:00] - Introduction & Common IGBT Blast Problems ​[02:32] - Powering Up Inverter PCB & Multimeter Setup ​[03:10] - Testing Microcontroller 2V Output at 270R Resistors ​[04:30] - Gate to Emitter Biasing Voltage Measurement ​[05:00] - Checking Optocoupler Pin 5 & Pin 8 Voltages (22V-26V Range) ​[06:46] - Fixing Power Supply Relay Clicking / Cycling Issue (Capacitor & PWM IC 3844) ​[09:00] - Safe IGBT Installation & Final Voltage Double-Check ​🛠️ Key Topics Covered: ​✅ Microcontroller 2V signal testing on 270R resistors ✅ Proper Gate-to-Emitter biasing voltage measurement ✅ Optocoupler (A350/TLP350) Pin 5 to Pin 8 DC voltage check (Keep under 30V) ✅ Repairing SMPS supply section (UC3844, TL431, and filter capacitors) #SolarInverterRepair #InverterRepair #PCBRepair #IGBT #SolarInverter #OnGridInverter #MicrocontrollerTesting #ElectronicsRepair #SunriseElectric #ElectronicsEngineering #SMPSRepair #SolarEnergy ✅ Safety tips to prevent brand-new IGBTs from blowing up instantly how to repair invt vfd, how to connect lithium battery with inverter, solar inverter diagram available,how to make lithium ion battery in home,how to repair bikes charger,how to reset Invt VFD dispec ic 1.8 version problem, local inverter hybrid LCD fault codes