LG 37LH250H Service Manual page 18

2. Digital TV Video
Check RF cable & Signal.
OK
Check Tuner 5V Power
IC1001 4pin
OK
Check IF_P/N Signal
OK
Check Check Demodulator Input
Clock(X1005)
OK
Check IC1004(LGDT) Output
- AR1070, AR1071
OK
Check Mstar LVDS output
R812, R813,..., R821
3. Analog TV Video
Check RF cable.
OK
Check Tuner 5V Power.
IC1001 4pin
OK
Check CVBS signal.
TU1001 #19 Pin
OK
Check Mstar LVDS output
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Only for training and service purposes
No
Check IC1002
(19",22")Check IC1002.
No
Replace Tuner.
No
Replace X1005.
No
Replace IC1004.
No
Replace Mstar(IC100) or Main board.
No
Check IC1002
Check IC1005(19",22")
No
Bad Tuner.
No
Replace Mstar(IC100) or Main board.
- 18 - LGE Internal Use Only