LG 42LV375H - Troubleshooting Guide; Power-Up Boot Fail Troubleshooting; No OSD Troubleshooting

- 14 -
LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING GUIDE
1. Power-Up Boot Fail Trouble Shooting guide
Check P1501 All Voltage
Level (3.5 V, 12 V, 20/24 V)
Check power connector and
RL_ON signal.
N
Check IC703 RESET pin. Check Switch SW700.
N
Y
Replace Power board.
N
Check X701 Clock 10 MHz.
Check X903 Clock 54 MHz.
Check X701/X903 application
circuit or Replace X701/X903.
N
Y
Check IC703 UART
communication 44, 45 pin.
Check UART line or replace
IC703.
N
Y
Check IR input state of IC703
13 pin.
Check IR board.
N
Y
Re-download NEC MICOM.
Y
2. No OSD Trouble Shooting guide
Check P1501 All Voltage
Level (3.5 V, 12 V, 20 V)
Check power connector and
RL_ON signal.
N
Check Q1504 output Voltage
(12V).
Check Q1504 application circuit
or replace Q1504.
N
Y
Replace Power board.
N
Check LVDS FFC Cable. Replace Cable.
N
Y
Check LCD Module Control
board.
Y