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LGE Internal Use OnlyCopyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
10. RS-232C(DSUB 9P) function Trouble Shooting guide
- Ext Power Out
Is the 5 V or 12 V out “Yes” on
Installation menu?
Set “Yes” on Installation menu.
N
Check the IC1509(12 V),
IC1508(5 V).
Replace IC1509, IC1508.
N
Y
Check the Q1506
(EXT_PWR_DET) line.
Replace Q1506 part.
N
Y
Replace Main board.
Y
11. Commercial Function Trouble Shooting guide
- Front Clock
Check the Clock display setting
“Yes” on Installation menu.
Set “Yes” on Installation menu.
N
Check the “Time” setting on
user menu.
Set Time/Clock on user menu.
N
Y
Y
Is the clock cable normal?
Y
- IR Out
Check the IR Waveform of
Q2401, Q2402.
Replace Q2401, Q2402.
N
Replace IC702.
N
Check the clock cable.
N
Check the +5 V_ST Line. Replace the IC706.
N
Y
Check the IC705.
Y
Check the LED Clock Ass’y.
Replace the IC705
N
Check the JK1100 4 Pin
connection.
Check the IC702.
Y
Y
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