LG 47LS5700 / 47LS579C (CHASSIS:LA22E) Service Manual ▷ View online
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7. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID I2C Signal
R3308,R3309,R3314,R3315,
R3328,R3329,R3302,R3303
Check JK3300, JK3301, JK3302
JK3303
ok
ok
ok
No
No
Replace LGE2112(IC105) or Main Board
ok
Replace Jack
Check HDMI Signal
Check other set
If no problem, check signal line
No
Check Mstar LVDS Output
Replace LGE2112(IC105) or Main Board
ok
No
Replace Main Board
No
Check HDMI_DET(HPD)
No
ok
Check Several component
Q3300,Q3301,Q3302,Q3303
No
Replace LGE2112(IC105) or Main Board
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8. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P5400
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC5400)
ok
No
Check Connector & P5400
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC5400) Power
24V, 3.3V
No
Replace Amp IC(IC5400)
Check Mstar I2S Output
IC5400 9,10,11 Pin
No
Check signal line. Or replace LGE2112(IC105)
Check Mstar AUDIO_MASTER_CLK
R368
No
Replace LGE2112(IC105) or Main Board
ok
Check AMP I2C Line
R5402,R5403
No
Check signal line. Or replace LGE2112(IC105)
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9. Digital TV Audio
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
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
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
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10. Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check CVBS Signal
TU3700 8 Pin
ok
ok
No
No
Bad Tuner. Replace Tuner.
Check Tuner 3.3V Power
L6503
Replace L6503
Check Tuner 1.8V Power
IC6503 2 pin : 1.8V
Replace IC6503
ok
No
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