DOWNLOAD LG 47LB9R (CHASSIS:LP7AB) Service Manual ↓ Size: 3.41 MB | Pages: 37 in PDF or view online for FREE

Model
47LB9R (CHASSIS:LP7AB)
Pages
37
Size
3.41 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
47lb9r-chassis-lp7ab.pdf
Date
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- 17 -
2-2. In the case of doesn't work normally at specific input mode 
(1) Symptom
1) The screen doesn't work normally at specific input mode (RF, AV, Component, RGB, HDMI)
(2) Check follow
1) Check the all input model if all input display normally.
2) Check the PIP and Double Window if it display normally.(Re-Check it Swap)
(3) In case of unusual situation from RF mode
Is the Tuner normal?
No
Yes
Yes
Cable inserts well.
Replace Tuner
Replace IC611
Is the Tuner Cable
connected well?
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
No
Is normal the 
Input voltage, IIC
Communication and CVBS
output?
No
No
Is the IC611 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
- 18 -
(4) When set doesn’t display normally at RF , AV mode
(5) When set doesn't display nromally at Component, RGB mode
(6) In the case of becomes unusual display from HDMI mode
Yes
Replace IC1200
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC1200 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
Yes
Replace IC611
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC611 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
- 19 -
3.  In case of no sound
(1) Symptom
1) LED is White
2) Screen existent, but Sound isn’t
(2) Check follow
No
No
No
All input(mode)
is no sound?
Only HDMI is 
no sound?
Replace IC400
Replace IC401
Replace 
VSC B/D
Set on speaker in menu
Download the EDID data
Check the speaker cable
No
Only RF is 
no sound?
Check the Tuner In/Out
No
No
No
Replace IC402
No
Is the Speaker 
on in Menu?
Yes
Yes
Yes
Is the speaker
cable normal?
Yes
Yes
Yes
Yes
IC1401 operate 
normally?
IC1401 operate 
normally?
IC402 operate 
normally?
BLOCK DIAGRAM
- 20 -
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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