LG 50PX950 Service Manual page 57

2. No OSD Trouble Shooting
Check P500 5V_ON
Check P202 DISP_EN
Y
Check 5V Voltage Level
at P500
Y
Check 5V Voltage Level
at L501
Y
Check all multi voltage
(1.2v, 3.3v, 1.8v)
Y
Check P202
(TXAC-), (TXAC+), (TXBC-),
(TXBC+)
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 L501
& Recheck
N
Check power up boot sequence
N
Maybe BCM3556(IC100)
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