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42PT350B-SG (CHASSIS:PB12K) - LG TV Service Manual (repair manual). Page 37

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