LG 55LH5750, Service Manual

Page: 10 / 18

- 10 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Check Audio (Speaker out)
Audio OK
Next page (Back-end block)
Audio NG
Check voltage 13V
P2300 3,4,5,6, pin
NG
Check Power connector
(12PIN)
NG
Short check
voltage 13V
NG
Replace Power board.
Check stand-by voltage 13V
L2303,,C2303
NG
Replace
L2303,,C2303
OK
Check X-TAL X101
NG
Replace X101
OK
Check POWER ON signal
P2300 1 pin
Low
Download software (Main)
NG
Replace IC101
or Main Board
Check multi voltage 13V_A
P2300 7,8
NG
Check Power connector
(12PIN)
NG
Short check
multi voltage 13V
NG
Replace Power board.
OK
High
Check Main IC power block
IC2302 : 1.5V ,Q2303: 3.3V
IC2301 : 1.1V
Replace IC404, Q406, IC403
OK
Check Audio (Speaker out)
Audio NG
Previous page (Main IC block)
Audio OK
LVDS output signal
NG
OK
Replace IC101 or Main Board
LVDS power voltage Q2302 : 13V
NG
Replace Q2302
Check DRV ON signal
P2300 INV_CTL 11 pin
Low
Replace Main Board
OK
Check Power Board
Check LVDS cable
NG
Check LVDS cable
Check LCD Module
High
OK
TROUBLE SHOOTING GUIDE
1. No video (Main IC Block)
2. No video (Back-end Block)