Read LG 22LG3DCH (CHASSIS:LA76A) Service Manual online
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3. Digital TV Video
Check RF Cable
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has problems
Check LGDT3304 Output
Clock(R404), Data(AR436,437),
Sync(R441)
Y
Y
N
Check Tuner 5V Power
IC701
Replace IC701
Y
N
Y
Maybe LGDT3304(IC400) has
problems
N
Maybe LGDT3304(IC400) has
problems
Check LD400 color
Bad Tuner. Replace Tuner.
None
red
4. Analog TV Video
Check RF Cable
Check CVBS signal
TU100 #16 Pin
Maybe Tuner(TU400) has problems
Y
N
Y
N
Y
Maybe FI-8668(IC506) has
problems
Check Tuner 5V Power
IC701
Replace IC701
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has problems
N
Y
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