LG 42PT250B Service Manual page 35

1. Power-Up Boot Fail Trouble Shooting
Check P501 All Voltage Level
(17V, 5V, 3.5/5V_ST)
Y
Check All Voltage Level
at Bead, RL_ON, IC101 output
Y
Check Voltage Level 3.3V at IC504,
L508
Y
Check Voltage Level 1.26V at L503
Y
Check Voltage Level 1.5V
At L502
Y
Check Voltage Level 2.5V at L510
Y
Check X200 Clock24MHz
Y
Check signal transition
at IC103
Y
Check signal transition
IC104
Y
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Only for training and service purposes
N
Check Power connector
N
Replace one of Bead, IC101
& Recheck
If IC504 Output is normal,
N
Replace of the IC504
& Recheck
Check R506 voltage level
N
(3.3V RL_ON)
Replace one of IC101 & Recheck
Check R503 voltage level
N
(ON/OFF Control)
Replace one of IC101 & Recheck
N
Replace one of IC101 and application
circuit & Recheck
N
Replace X200
N
Maybe Serial Flash Memory
problem
N
Maybe NAND Flash Memory or
S7LR have troubles
Y
Replace Power board
N
N
Check SW Redownload or replace
N
N
N
N
Check S7LR Main chip and
Soc_Reset Signal from PM GPIO
N
Check DDR Memory
/Replace one
LGE Internal Use Only