Trouble Shooting Guide - LG 43LH570 Series Service Manual

1. No video (Main IC Block)
Check Audio (Speaker out)
Audio NG
Check voltage 13V
P2300 3,4,5,6, pin
OK
Check stand-by voltage 13V
L2303,,C2303
OK
Check X-TAL X101
OK
Check POWER ON signal
P2300 1 pin
High
Check multi voltage 13V_A
P2300 7,8
OK
Check Main IC power block
IC2302 : 1.5V ,Q2303: 3.3V
IC2301 : 1.1V
2. No video (Back-end Block)
Check Audio (Speaker out)
Audio OK
LVDS power voltage Q2302 : 13V
OK
LVDS output signal
OK
Check DRV ON signal
P2300 INV_CTL 11 pin
High
Check LVDS cable
OK
Check LCD Module
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Only for training and service purposes

TROUBLE SHOOTING GUIDE

Audio OK
Next page (Back-end block)
NG
Check Power connector
(12PIN)
NG
Replace
L2303,,C2303
NG
Replace X101
Low
Download sof tware (Main)
NG
Check Power connector
(12PIN)
NG
Replace IC404, Q406,
IC403
Audio NG
Previous page (Main IC block)
NG
Replace Q2302
NG
Replace IC101 or Main Board
Low
Replace Main Board
NG
Check LVDS cable
NG
Short check
voltage 13V
NG
Replace IC101
or Main Board
NG
Short check
multi voltage 13V
- 17 -
NG
Replace Power board.
NG
Replace Power board.
Check Power Board
LGE Internal Use Only