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1. Check the booting Voltage
Make sure the Stand-by Voltage
P401 3, 5pin : +3.5V_ST
Yes
Make sure the Micom voltage
L403 : +3.5V _ST
Yes
Make sure the CLK of X201
Is 24MHZ
Yes
Make sure the PWR_ON of P401
1pin : 3.5V
Yes
Make sure the Multi Voltage
P401 9, 10pin : 24V , 13~15pin : 12V
Yes
Make sure the Output Voltage of IC 402/3/7
IC402: 2.5V, IC403: 1.1V, IC407: 1.5V , Q403: 3.3V
Yes
Make sure the voltage of LVDS Power
Q406: 12V
Yes
Make sure the output of MSTAR LVDS
Yes
Make sure the Inverter control and error
P401 2pin: High
Yes
Exchange the LCD Module
2. Digital TV Video
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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING GUIDE
Make sure the Power
No
Connector
No
Exchange the L403
No
Exchange the X201
No
Re- download of Firmware
No
Exchange the circuit board
No
Exchange the IC402/3/7,
Q403
No
Exchange the Q406
No
Exchange the Mstar(IC101)
Or Main board
No
Exchange the circuit or
check the LCD Module
- 15 -
Make sure the disconnection of
Yes
Main board 3.5V circuit
No
Exchange the Mstar(IC101)
Or Main board
Exchange the
Yes
Circuit board
LGE Internal Use Only
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