Trouble Shooting Guide - LG 42LV375H Service Manual

1. Power-Up Boot Fail Trouble Shooting guide
Check P1501 All Voltage
Level (3.5 V, 12 V, 20/24 V)
Y
Check IC703 RESET pin.
Y
Check X701 Clock 10 MHz.
Check X903 Clock 54 MHz.
Y
Check IC703 UART
communication 44, 45 pin.
Y
Check IR input state of IC703
13 pin.
Y
Re-download NEC MICOM.
2. No OSD Trouble Shooting guide
Check P1501 All Voltage
Level (3.5 V, 12 V, 20 V)
Y
Check Q1504 output Voltage
(12V).
Y
Check LVDS FFC Cable.
Y
Check LCD Module Control
board.
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Only for training and service purposes

TROUBLE SHOOTING GUIDE

N
Check power connector and
RL_ON signal.
N
Check Switch SW700.
N
Check X701/X903 application
circuit or Replace X701/X903.
N
Check UART line or replace
IC703.
N
Check IR board.
N
Check power connector and
RL_ON signal.
N
Check Q1504 application circuit
or replace Q1504.
N
Replace Cable.
N
N
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Replace Power board.
Replace Power board.
LGE Internal Use Only