LG 37LH250H Service Manual page 22

9. Digital TV Audio
Check Tuner 5V Power
TU1001 4pin.
OK
Check IF_P/N Signal.
OK
Check Demodulator Input Clock(X1005).
OK
Check IC400(LGDT) Output
- AR1070, AR1071
OK
Check Output Signal
P600 1, 2, 3, 4 pin
OK
Check Connector & P600
OK
Check speaker resistance
and connector damage.
10. Analog TV Audio
Check RF Cable.
OK
Check Tuner 5V Power
TU1001 4pin
OK
Check SIF buffer signal.
OK
Follow procedure All source audio
trouble shooting guide.
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Only for training and service purposes
No
Check IC1002.
Check IC1005(19", 22")
No
Bad Tuner. Replace Tuner
No
Replace X1005.
No
Replace IC400.
No
Replace NTP3100L
(Audio AMP) IC500
No
Replace connector
if found to be damaged.
No
Replace speaker.
No
Check IC1002.
Check IC1005(19", 22").
No
Check SIF Signal line.
No
Replace Mstar(IC100)
or Main board.
- 22 -
No
Bad Tuner.
No
Bad Tuner
Replace Tuner.
LGE Internal Use Only