LG 75UM7570AUE Service Manual page 88

`17Y OLED(W7) Power Board Diagnostic method
1
▶ Disconnect the Main Board 24Pin Power Cable connector.
3
▶ Switch the LCD MODEL S/W to 20V by checking
the power voltage.
▶ Fix the LCD MODEL switch to 20V.(Smart JIG)
2
▶ Connect the 24Pin Power Cable connector
to the Muitl Gender JIG 28Pin connector
4
▶ When the OK LED(24V,12V) turns on, Power Board is normal.
▶ When the NG LED turns on, the Power Board
can be judged as defective.
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