Read LG 42PT350B-SA (CHASSIS:PB11K) Service Manual online
1. Power-Up Boot Fail Trouble Shooting
Replace Power board
N
Y
Check Micom Redownload or
replace
Check P500 All Voltage Level
(17V, 5V, 3.5/5V_ST)
Check Power connector
Y
Check Voltage Level 3.3V at IC504,
R124(Micom)
N
If Q501 Output is normal,
Replace of the IC504
& Recheck
Y
N
Check Voltage Level 1.26V at C534
N
Check R527 voltage level
(3.3V RL_ON)
Replace one of IC501 & Recheck
N
Y
Check Voltage Level 1.5V
at IC502 #7 pin
N
Check R500 voltage level
(ON/OFF Control)
Replace one of IC502 & Recheck
N
Y
Check Voltage Level 2.5V at C589
N
Replace one of IC505 and application
circuit & Recheck
N
Y
Check X200 Clock24MHz
N
Replace X200
Y
Check signal transition
at IC103
N
Maybe Serial Flash Memory
problem
Check signal transition
IC104
Y
Check All Voltage Level
at Bead, RL_ON, IC500 output
N
Replace one of Bead, IC500
& Recheck
Y
N
Maybe NAND Flash Memory or S7
have troubles
Y
Check DDR Memory
/Replace one
Check S7 Main chip and Soc_Reset
Signal from micom GPIO
N
N
N
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