LG 55LH575A Service Manual page 11

3. Digital / Analog TV Video No signal
Check RF cable & signal
OK
Check Tuner power
L6504: 3.3V
OK
Check Tuner I2C
R651, R652, R115, R116
OK
Check IF signal
TU6703 6,7 pin
OK
Replace IC101 or Main Board
4. AV Video No signal
Check input signal f ormat.
Is it supported?
OK
Check AV cable
OK
Check AV Jack CVBS signal
R3407
OK
Check CVBS signal
VA3415,R3421,C3411,R3407
R340, C321
OK
Replace IC101 or Main Board
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Only for training and service purposes
NG
Replace L6504
NG
Replace R651, R652, R115, R116
NG
Replace Tuner
NG
Replace AV Jack JK3401
NG
Replace VA3415,R3421,C3411,R3407R340,C321
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Replace Tuner
NG
or IC101
or Main Board
LGE Internal Use Only