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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LG 47LF7700 Service Manual ▷ View online

              - 29 -                                                         
 
   
 
 
5.  In case of no sound 
(1) Symptom 
1) LED 
is 
blue. 
2)  Screen display but sound is not output 
 
(2) Check follow 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
All input(mode) 
  is no sound? 
No 
Is VCC “+16V or +20V” 
Normal?(JP1 : 1pin) 
Yes 
No 
Replace Power Board.
Yes 
Is the speaker Cable 
normal?
No 
Check the Speaker 
Cable 
Only HDMI is 
no sound? 
Download 
the EDID data. 
No 
No 
Only DTV is 
no sound? 
No 
Yes 
Check the Tuner In/Out
Yes 
Only AV/component/PC 
input is no sound? 
No 
Check the input source.
Yes 
Replace Main Board. 
              - 30 -                                                         
 
   
 
 
6.  Exterior view defectiveness 
(1) Check follow 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Damage LCD module? 
Replace LCD Module
No 
Damage cabinet? 
No 
Yes 
Yes 
Replace cabinet
Yes 
Damage RCU? 
Replace RCU.
No 
Replace stand
Scratch Stand? 
Yes 
              - 31 -                                                         
 
   
 
 
BLOCK DIAGRAM
 
 
 
 
 
 
 
 
              - 32 -                                                         
 
   
 
 
WIRING DIAGRAM
 
 
1. 32LF7700-ZC 
 
 
 
2. 37LF7700-ZC 
Main Board
Ass y
(P/No. : EBU60703401)
LIPS
(LCD Inverter 
Power Supply)
(P/No. : EBU60703601)
MAIN to IR&Intelligent
(P/No. : COV30100801)
Inverter  Slave Cable 
=> Contact with P401
(P/No. : COV30100503)
KEY
 BOAR
D  
CH-
CH
+
TV
/A
V
Men
u
V-
V+
CO
N
(P/
N
o. :
 EBR
488
47001)
IR&Intelligent
BOARD
(P/No. : EBR42600102)
CO
N
CO
N
JP471
JP
2
JP261
Intelligent B/D to Bar Shield Left 
(P/No. : COV30100401)
JP1
P201
LIPS to MAIN B/D  
(P/No. : COV30100302)
Speaker Woofer
(P/No. : EAB41280401)
SC101
Noise Filter
(P/No. : EAM36140904)
Inverter Master Cable
=> Contact with P402
(P/No. : COV30100502)
Speaker Twitter
(P/No. : EAB41284401)
SPK Cable  
(P/No. :  COV30100701)
STBY
LCD T-CON BOARD
(P/No. : EAT60663401)
CON
P401
CON
P402
CON
LVDS Cable
@ F-HD/ 50Hz
(P/NO. : COV30100601)
LCD PANEL
LC370WUE-SBB2
(P/No. : EAJ59211901)
Noise Filter to SMPS
(P/No. : COV30100401)
 
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