LG 22LF4520-PU - Page 14

- 14 -
LGE Internal Use Only
Copyright © LG Electronics. Inc. All right reserved.
Only for training and service purposes
2. No Picture
Replace Cable
N
Module Back Light On?
Check IC700 & Q700
Replace LED Driver IC or FET
Y
N
N
Check Panel Power 5V (P402 #01)
Check IC503 Output 5V
Replace IC503 &
Recheck
Y
N
Check Panel input Clock
P402 (#10, #11, #22, #23 )
Check IC300
Repair Main B/D
Y
N
Check FFC Cable for Damage or
Open Conductors
Check LED Driver Output
(C706)
Replace T
-
Con Board or Module
Y
Check IC300
Replace Main SOC
N
Check WLED_ENABLE High?
Y