Power-Up Boot Fail Trouble Shooting guide
xxLP620H/645H-UH
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
Check Q407 output Voltage(12V)
Y
Check LVDS Cable
Y
Check LCD Module
Control board
No OSD Trouble Shooting guide
xxLP620H/645H-UH
Check P401 All
Voltage Level (3.5V, 12V, 24V)
Y
Check IC5002 RESET and
UPDATE pin
Y
Check X5000 Clock
32.768kHz
Y
Check IC5002 IIC
Communication status
Y
Check IR input state of IC5002
57pin
Y
Re-download PTC Micom
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Only for training and service purposes
TROUBLE SHOOTING
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 SW5000, SW5001
N
Check X5000 application circuit
or Replace X5000
N
Check IIC line or replace IC5002
N
Check IR board
- 18 -
N
Replace Power Board
N
Replace Power Board
LGE Internal Use Only