LG 43LF5400-UB Service Manual page 17

2. Digital / Analog TV Video
Check RF Cable & Signal
OK
Check Tuner 3.3V Power
L500
OK
Check IF_P/N Signal
TU501 6,7 Pin
OK
Check Mstar LVDS Output
3. AV Video
Check input signal format.
Is it supported?
OK
Check AV Cable for damage
f o r d a m a g e o r o p e n
conductor
OK
Check JK401,
CVBS Signal Line
R120
OK
Check CVBS_DET Signal
OK
C h e c k M s t a r LV D S
Output
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Only for training and service purposes
NO
Replace L500
NO
B a d Tu n e r. R e p l a c e
Tuner.
NO
Replace Mstar(IC102)
or Main Board.
NO
Replace Jack
NO
Replace AR401 or R110
NO
Replace Mstar(IC102)
or Main Board.
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