LG 42PT250B Service Manual page 37

2. No OSD Trouble Shooting
Check P501
5V_ON
Y
Check 5V Voltage Level
at P501
Y
Check 5V Voltage Level
at L507, L501
Y
Check 5V Voltage Level at L507
Y
Check P1401/P1402
(TXAC-), (TXAC+), (TXBC-),
(TXBC+), Display Enable
Y
Check LVDS Cable
Y
Check PDP Module
Electrical Specifications
Power Supply Sequence
Check CAS
Input Signal Timing Specification
Control Signal Register
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Only for training and service purposes
N
Check GPIO Path of PM
N
Check Power connector
N
Replace one of L507,501
& Recheck
N
Replace one of L507
& Recheck
N
Maybe S7LR(IC101)
has troubles
N
Replace Cable
Check 3D ASIC
*3D Trouble Shooting
Y
Replace Power board
It should satisfy the Pixel Clock on CAS.
LGE Internal Use Only