Can We Fix this LG OLED TV? How to Diagnose Your TV Before Ordering Parts!
Avoid ordering the incorrect part for your LG OLED TV!
Demo model: OLED77B2PUA
This tutorial applies to all LG OLED TVs
First, remove the back cover and power cord
If you power the TV on and hear a single relay click and the standby light flashes once, it means your main board is good.
Test the power supply by checking the 23V and 12 volt rails. With the multimeter probes in place, power the TV on. You should see the voltage come up briefly and then drop.
If you briefly see the voltage, disconnect the drive cables from the main board going to the T-con
Now recheck the power supply voltages. They should come up and stay.
This means the power supply is good and indicates a shorted panel which cannot be repaired. Contact the manufacturer if your TV is still under warranty.
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