Trouble Shooting - LG 49LF5400 Service Manual

1. Power-up boot check
Check PSU DC Voltage
P401_5,6,7,8 pin : 13.2V
OK
Check stand-by Voltage
L202 : +3.3V
OK
Check X100 clock
24 MHz
OK
Check P200 PWR_ON.
1pin : 3.3V
OK
Check IC402/3/4 Output
Voltage
IC202 : 1.15V & 5V
IC200 : 1.8V
Q204 : 3.3V
OK
Check TCON(Module)
Panel_VCC
Q205 : 13.2V
OK
C h e c k M s t a r LV D S
Output
OK
Check DRV ON Control
P200 11pin : High
OK
Change Module
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Only for training and service purposes

TROUBLE SHOOTING

NO
Check 12pin
Power connector
NO
Main B/D 3.3V Line
Short Check
NO
Replace X100
NO
Re-download software.
NO
Replace IC402, IC403,
IC404, Q403
NO
Replace Q205
NO
Replace Mstar(IC102) or
Main Board
NO
Check PSU
OK
Main B/D 13.2V Line
Short Check
OK
Replace IC201
(DCDC)
NO
Replace Mstar(IC102)
or Main board
- 16 -
OK
Replace PSU
LGE Internal Use Only