LG 50PJ350 Service Manual page 44

2. No OSD Trouble Shooting
Check P500
5V_ON
Y
Check 5V Voltage Level
at P500
Y
Check 5V Voltage Level
at L507, L501
Y
Check 5V Voltage Level at Q501
Y
Check P903
(TXAC-), (TXAC+), (TXBC-),
(TXBC+), Display Enable
Y
Check LVDS Cable
Y
Check PDP Module
Customer Oriented R&D
N
Check GPIO Path of Micom
N
Check Power connector
N
Replace one of L507,501
& Recheck
N
Replace one of Q501
& Recheck
N
Maybe S7(IC101)
has troubles
N
Replace Cable
Electrical Specifications
Power Supply Sequence
Check CAS
Input Signal Timing Specification
Control Signal Register
Y
Replace Power board
It should satisfy the Pixel Clock on CAS.
Breakthrough