LG 55QNED81SRA Service Manual page 78

Appendix. Checkpoints for module-related defects for UHD T-con less models (No screen / Sound Ok)
 Checkpoints for the power supplied from Main B/D to Module
- The voltage of the 5 points may be different for each module, but it must be within the voltage range as shown in the table below.
- If there is no power when it's connected to the Module, remove the cable connected to the Module and check.
(If the module is defective, the power may be lost because of the Module, not because of the Main B/D)
LS-VGL
VCC1.8
VGH1
VDD-EPI
HVDD
Pin Name Voltage range
VCC1.8 1.73V ~ 1.98V
LS-VGL -11V ~ -9V
VDD-EPI / 2
HVDD HVDD uses half the voltage of VDD-EPI
(7.7V~8.1V)
VDD-EPI 16.2V ~ 16.8V
32V ~ 36V
VGH1
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