Troubleshooting - LG 42CQ610H Service Manual

1. Power-Up Boot Fail Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
Check Q409 output Voltage(12V)
Y
Check LVDS Cable
Y
Check LCD Module
Control board
2. No OSD Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
Check IC1602 RESET and
UPDATE pin
Y
Check X1600 Clock
32.768MHz
Y
Check IC1602 IIC
Communication status
Y
Check IR input state of IC1602
57pin
Y
Re-download PTC Micom
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Only for training and service purposes

TROUBLESHOOTING

N
Check power connector and
RL_ON signal OK ?
N
Check Q409 application circuit
Or replace Q409
N
Replace Cable
N
Check power connector and
RL_ON signal OK ?
N
Check switch SW501, SW502
N
Check X1600 application circuit
or Replace X1600
N
Check IIC line or replace IC1602
N
Check IR board
- 13 -
N
Replace Power Board
N
Replace Power Board
LGE Internal Use Only