LG 55UJ634 Series Service Manual page 91

`16Y OLED(B6) Power Board Diagnostic method
1
▶ Connect the 24Pin Power Cable connector
to the Multi gender JIG 24Pin connector.
3
▶ 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.
2
▶ Switch the LCD MODEL S/W to
the power voltage.
▶ Fix the LCD MODEL switch to 24V.(Smart JIG)
A 28 (8/19)
24V by checking