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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.
L301 : +3.5V_ST
Yes
Make sure the CLK of X300
Is 10MHz.
Yes
Push Micom Reset(SW300) and
make sure the PWR_ON
P401 1pin : 3.3V
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.
Q409 : 12V
Yes
Make sure the output of MSTAR
LVDS.
Yes
Make sure the CLK of X300 is
10MHz.
Yes
Exchange the LCD Module.
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LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLESHOOTING GUIDE
No
Make sure the Power
Connector.
No
Exchange the L301.
No
Exchange the X300.
No
Re-download of
Firmware.
No
Exchange the circuit
board.
No
Exchange the
IC402/3/7, Q403.
No
Exchange the Q409.
No
Exchange the Mstar(IC101
or Main board.
No
Exchange the circuit or
check the LCD module.
- 15 -
No
Make sure the disconnection of
Main board 3.5V circuit.
No
Exchange the Mstar(IC101)
Or Main board
No
Exchange the
Circuit board.
LGE Internal Use Only
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