Read LG 42LT670H (CHASSIS:LA2AF) Service Manual online
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TROUBLESHOOTING
Power-Up Boot Fail Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
N
Check Q409 output Voltage(12V)
Y
Check LVDS Cable
Y
Check LCD Module
Control board
Check power connector and
RL_ON signal OK ?
N
Replace Power Board
Check Q409 application circuit
Or replace Q409
N
Replace Cable
N
No OSD Trouble Shooting guide
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
N
Check IC5002 RESET and
UPDATE pin
Y
Check X5000 Clock
32.768MHz
Y
Check IC5002 IIC
Communication status
Y
Check IR input state of IC5002
57pin
Y
Re-download PTC Micom
Check power connector and
RL_ON signal OK ?
N
Replace Power Board
Check switch SW5000, SW5001
N
Check X5000 application circuit
or Replace X5000
Check IIC line or replace IC5002
Check IR board
N
N
N
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