Trouble Shooting Guide - LG 22LS3700 Service Manual

1. Power-up boot check
Check stand-by Voltage.
IC3307
Pin 1, L3317 : +3.5V_ST
pin 5, R3387 : +3.5V_ST
ok
Check X201 clock
24 MHz
ok
Check Q3302
RL_ON_BUFFER : 3.3V
ok
Check Multi Voltage
P3300 1~5 pin: +24V
JK3300, L3304 : +24V/+15V
ok
Check IC Output Voltage
IC3310 : 2.5V
IC3304 : 1.2V
IC3305 : 1.5V
Q3312 : 3.3V
ok
Check LVDS Power Voltage
Q3307 : 12V
ok
Check Mstar LVDS Output
ok
Check Error Out & Inverter Control
P3300 pin 11 : Low
P3300 pin 12 : High
ok
Change Module
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Only for training and service purposes
TROUBLE SHOOTING
No
Check Power connector
No
Replace X201
No
Re-download software.
No
Replace Adapter
No
Replace IC3304/3305/3310 or Q3312
No
Replace Q3307
No
Replace Mstar (IC101) or Main Board
No
Check Power Board or Module
- 15 -
ok
Main B/D 3.5V Line
Short Check
No
Replace Mstar(IC101) or Main board
ok
Replace Power board.
LGE Internal Use Only