LG 50PJ350 Service Manual page 42

1. Power-Up Boot Fail Trouble Shooting
Check P500 All Voltage Level
(17V, 5V, 3.5/5V_ST)
Y
Check All Voltage Level
at Bead, RL_ON, IC500 output
Y
Check Voltage Level 3.3V at IC504,
R124(Micom)
Y
Check Voltage Level 1.26V at C534
Y
Check Voltage Level 1.5V
at IC502 #7 pin
Y
Check Voltage Level 2.5V at C589
Y
Check X200 Clock24MHz
Y
Check signal transition
at IC103
Y
Check signal transition
IC104
Y
Customer Oriented R&D
N
Check Power connector
N
Replace one of Bead, IC500
& Recheck
If Q501 Output is normal,
N
Replace of the IC504
& Recheck
Check R527 voltage level
N
(3.3V RL_ON)
Replace one of IC501 & Recheck
Check R500 voltage level
N
(ON/OFF Control)
Replace one of IC502 & Recheck
N
Replace one of IC505 and application
circuit & Recheck
N
Replace X200
N
Maybe Serial Flash Memory
problem
N
Maybe NAND Flash Memory or S7
have troubles
Y
Replace Power board
N
N
Check Micom Redownload or
replace
N
N
N
N
Check S7 Main chip and Soc_Reset
Signal from micom GPIO
N
Check DDR Memory
/Replace one
Breakthrough