LG 65SM9000PUA Service Manual page 102

`16Y LED(UH95/UH96) Power Board Diagnostic method
1
▶ Check power board voltage.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
3
▶ Connect the 28Pin Power Cable connector
to the Muitl Gender JIG 28Pin connector
2
▶ Disconnect the Main Board 28Pin Power Cable connector.
4
▶ When the OK(24V,12V) LED turns on, Power Board is normal.
▶ When the NG LED turns on, the Power Board
can be judged as defective.
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