LG 47LE8500 (CHASSIS:LA02E) Service Manual ▷ View online
10. Trouble shooting - No video or Abnormal image (M+S block)
Check mini-LVDS FFC cable
Check VDD_LCM (16V)
and VCC_LCM (3.3V)
Check P-Gamma Data
Check IC9100
AVDD (R9112)
Check P-Gamma IC
I2C Line
Check PANEL_VCC
(IC9103)
No good
Check Q8004,Q803,Q8001
And PANEL_CTRL
No good
Replace IC9003
No good
OK
Check IC9003
(each pin, esp R9144, R9145,
R9156,R9157,R9166)
Replace
No good
OK
Check VGL (-5V)
Check IC9003
(each pin, esp R9129,R9130,R9131)
Check VGH (+25V)
No good
No good
Replace IC9003
No good
OK
OK
Check HVDD
Check IC9102
(each pin, esp R9126,R9127,R9128)
No good
Replace IC9102
No good
OK
No good
OK
Check output
data
OK
Replace P-Gamma IC
(IC9100)
No good
Check VDD_ODD/VDD_EVEN/
CLK1~6 & GCLK1~6
Check IC9101
(Each power)
No good
Replace IC9101
No good
OK
Check Module
Or LG5111/LGE7378A
OK
7.9
16.2
-5.3
28
N/A
120Hz
Edge
55
7.7
15.5
-5
28
29
120Hz
Edge
47
8
16.25
-5
27.69
29.15
120Hz
Edge
42
HVDD
VDD_LCM
VGL
VGH (25℃)
VGH (0℃)
Module
Q Remark
11. Trouble shooting - No Audio (all audio source)
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P8800
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC8801)
ok
No
Check Connector & P8800
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(IC8801) Power
*20V, 3.3V, 1.8V.
No
Check Regulator IC8800
Check Mstar I2S Output
R8801, R8802, R8803
No
Check signal line.
Or replace BCM( IC900)
Check AUDIO_MASTER_CLK
R8828
No
Replace BCM( IC900) or Main Board.
ok
Check AMP I2C Line
R8804, R8805
No
Check signal line.
Or replace BCM( IC900)
Check RF Cable & Signal
Check Tuner 3.3V Power
L701
Replace L701
Check Tuner 1.2V Power
IC700 2 pin : 1.26V
Check IF_P/N Signal
TU700 17,18 Pin
Replace IC700
Check Tuner 5V Power
L700
ok
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
Check IC8003
No
Replace IC8003
No
Replace L8007
ok
12. Trouble shooting - No audio (Digital TV audio)
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
Check RF Cable & Signal
Check Tuner 3.3V Power
L701
Replace L701
Check Tuner 1.2V Power
IC700 2 pin : 1.2V
Replace IC700.
ok
ok
No
No
Check Tuner 5V Power
L700
ok
Check IC8003
No
Replace IC8003
No
Replace L8007
ok
13. Trouble shooting - No audio (Analog TV audio)
Check TU_SIF path
Including Q701 TR buffer to LGE3549
ok
Check SIF Signal
TU700 9th Pin
ok
No
Bad Tuner. Replace Tuner.
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
No
Replace component
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