LG Electronics 50PT490B, 50PT490B-SA, 50PT490B-SD - page 42

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1. Power-Up Boot Fail Trouble Shooting
Replace Power board
NY
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)
NIf Q501 Output is normal,
Replace of the IC504
& Recheck
Y
N
Check Voltage Level 1.26V at C534 NCheck R527 voltage level
(3.3V RL_ON)
Replace one of IC501 & Reche ck
N
Y
Check Voltage Level 1.5V
at IC502 #7 pin
NCheck R500 voltage level
(ON/OFF Control)
Replace one of IC502 & Reche ck
N
Y
Check Voltage Level 2.5V at C589 NReplace one of IC505 and application
circuit & Recheck
N
Y
Check X200 Clock24MHz NReplace X200
Y
Check signal transition
at IC103
NMaybe Serial Flash Memory
problem
Check signal transition
IC104
Y
Check All Voltage Level
at Bead, RL_ON, IC500 output
NReplace one of Bead, IC500
& Recheck
Y
NMaybe NAND Flash Memory or S7
have troubles
Y
Check DDR Memory
/Replace one
Check S7 Main chip and Soc_Reset
Signal from mi com GPIO
N
N
N