LG 47LS5700 / 47LS579C (CHASSIS:LA22E) Service Manual ▷ View online
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2. Digital TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L6503
Replace L6503
Check Tuner 1.8V Power
IC6503 2 pin : 1.8V
Check IF_P/N Signal
TU6500 10/11 Pin
Replace IC6503
Check Mstar LVDS Output
Replace LGE2112(IC105) or Main Board.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
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3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L6503
Replace L6503
Check Tuner 1.8V Power
IC6503 2 pin : 1.8V
Check CVBS Signal
TU3700 8 Pin
Replace IC6503 .
Check Mstar LVDS Output
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner.
Replace LGE2112(IC105) or Main Board.
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4. AV Video
5. Component Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK3800
CVBS Signal Line
R341
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
Replace R3801
No
Check Mstar LVDS Output
Replace LGE2112(IC105) or Main Board.
No
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK3801
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack
Check COMP_DET Signal
Replace R3806
No
Check Mstar LVDS Output
Replace LGE2112(IC105) or Main Board.
ok
No
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6. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID
I2C Signal
R3643, R3644(SCL,SDA)
Check JK3603
H/V_Sync/R/G/B Signal Line
ok
ok
ok
No
No
Replace LGE2112(IC105) or Main Board
ok
Replace Jack
Check DSUB_DET
Replace Jack
No
Check Mstar LVDS Output
Replace LGE2112(IC105) or Main Board
ok
No
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