DOWNLOAD LG 47LF7700 Service Manual ↓ Size: 3.34 MB | Pages: 60 in PDF or view online for FREE

Model
47LF7700
Pages
60
Size
3.34 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
47lf7700.pdf
Date
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              - 25 -                                                         
 
   
 
 
3. No Raster 
 
(1) Symptom 
1)  No OSD and image occur at screen.
 
2)  It maintains the condition where the front LED is blue
 
 
(2) 
Check follow
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Does minute discharge 
At Module? 
Is the LVDS 
cable normal? 
Is the U102(FLI10620H) 
Output normal? 
Yes 
Yes 
No 
No 
No 
Is output the normality 
Low/High voltage except 
stand-by 5V? 
Reconnect the LVDS 
cable. 
No 
Yes 
Yes 
Is the inverter on?
Replace Main Board.
Replace Main Board.
Check the LCD 
Module
              - 26 -                                                         
 
   
 
 
4.  In case of occur strange screen into specific mode 
1)  In case of does't display the OSD 
(1) Symptom 
1) LED 
is 
blue. 
2)  The minute discharge continuously becomes accomplished from module 
 
(2) Check follow 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Is normal the LVDS 
cable? 
Is the LVDS 
cable normal? 
Is normal the T-Con 
Board of Module? 
Yes 
Yes 
No 
No 
No 
No 
Yes 
Is the LVDS cable 
connected well?
Replace Power Board.
Replace T-Con Board 
or LCD Module. 
Cable inserts well. 
No 
Yes 
Operates the 
U102(FLI10620H)?
Replace Main Board.
Replace 
U102(FLI10620H)
              - 27 -                                                         
 
   
 
 
2)  In case of does't display the screen into specific mode 
 
(1) Symptom 
e)  The screen does not become the display from specific input mode 
(RF, AV, Component, RGB, DVI).
 
(2) Check follow 
(1)  Check the all input mode should become normality display.
 
 
(3)  In case of becomes unusual display from D/A mode 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(4)  In case of becomes unusual display from A/V mode 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(5)  In case of becomes unusual display from Component, RGB mode 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Is normal the Tuner? 
(D/A, Freesat) 
Is normal the 
U102(FLI10620H) 
Yes 
No 
No 
No 
Yes 
Is the Tuner cable 
connected well?
Is normal the Input voltage, 
IIC Communication and 
AV2 CVBS output? 
Cable inserts well. 
Yes 
Is normal the Input voltage, IIC 
Communication and HV sync?
 
Replace IC or Main 
Board. 
No 
Replace Tuner or Main 
Board. 
Block  A 
Is Video input of the AV 
Jack(JP452) normal? 
Same as Block A 
Yes 
No 
Check the input source. 
No 
Is R,G,B input and H,V sync 
of the JP361 normal? 
Same as Block A 
Yes 
Check the input source. 
              - 28 -                                                         
 
   
 
 
(6)  In case of becomes unusual display from HDMI mode 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(7)  In case of becomes unusual display from SCART1 mode 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(8)  In case of becomes unusual display from SCART2 mode 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
No 
Is normal the 
TDA9996(U321)? 
Same as Block A 
Yes 
Check the input source. 
(Is normal the Input voltage, IIC 
Communication and HV sync?)
No 
Is Video input of A/V Jack 
normal?(JP401) 
Same as Block A 
Yes 
Check the input source. 
No 
Is Video input of A/V Jack 
normal?(JP431) 
Same as Block A 
Yes 
Check the input source. 
Replace IC or Main 
Board. 
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