DOWNLOAD LG 42LN549C / 42LN549E (CHASSIS:LJ3AC) Service Manual ↓ Size: 11.55 MB | Pages: 38 in PDF or view online for FREE

Model
42LN549C 42LN549E (CHASSIS:LJ3AC)
Pages
38
Size
11.55 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42ln549c-42ln549e-chassis-lj3ac.pdf
Date
PREV: LG 42LN548C / 42LN549C / 42LP360H / 42LP361H (CHASSIS:LD3AC) Service Manual

LG 42LN549C / 42LN549E (CHASSIS:LJ3AC) Service Manual ▷ View online

- 17 -
No OSD Trouble Shooting
Check P1201 
Voltage Level  ST5V
Check
Power connector
Replace Power board
Check LVDS Cable
Check LCD Module 
Control board
Y
N
Y
Y
Check Q706 OUT
Voltage Level 3.3V
Replace Q706
Y
N
Replace Cable
N
Digital TV Video Trouble Shooting
Check RF Cable
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has 
problems
Check LGDT3304 Output
Clock(R404), 
Data(AR436,437), Sync(R441)
Y
Y
N
Check Tuner 5V Power
IC701
Replace IC701
Y
N
Y
Maybe LGDT3304(IC400) has 
problems
N
Maybe LGDT3304(IC400) has 
problems
Check LD400 color
Bad Tuner. Replace Tuner.
None
red
- 18 -
Analog TV Video Trouble Shooting
Check RF Cable
Check CVBS signal
TU100 #16 Pin
Maybe Tuner(TU400) has 
problems
Y
N
Y
N
Y
Maybe FI-8668(IC506) has 
problems
Check Tuner 5V Power
IC701
Replace IC701
Check IIC Signal
TU400 #7, 8 Pin
Maybe Tuner(TU400) has 
problems
N
Y
Component Video Trouble Shooting
Check signal format
Is it supported?
Check signal
R615,R616,R617(Y,CB,CR)
Replace it.
Y
N
Check JK601
Replace connector
Y
N
Y
Maybe LGE1854C(IC100) has 
problems
Y
Check Component Cable
- 19 -
RGB Video Trouble Shooting
Check signal format
Is it supported?
Check signal, Hsync, Vsync
R604,R601,R602,R631,R632
Replace it.
Y
N
Check JK605
Replace connector
Y
N
Y
Check RGB Cable
Y
Maybe LGE1854C(IC100) has 
problems
AV Video Trouble Shooting
Check signal format
Is it supported?
Check signal
Rear – R612 (Composite), 
R622 , R623 (S-Video) 
Side – R676 (Composite), 
Replace it.
Y
N
Check JK600 (Rear)
Check JK606 (SIDE)
Replace connector
Y
N
Y
Check AV Cable / S-Video Cable
Y
Maybe LGE1854C(IC100) has 
problems
- 20 -
HDMI Video Trouble Shooting
Check signal format
Is it supported?
Y
Check JK800
Replace connector
Y
N
Y
Check HDMI Cable
Check EDID NVRAM (IC800)
Power #8 & I2C Signal (#5, #6)
Replace it or redownload
Y
N
Check  Clock Signal
R815,R816
Replace it
Y
N
Maybe LGE1854C(IC100) has 
problems
Page of 38
Display

Click on the first or last page to see other 42LN549C / 42LN549E (CHASSIS:LJ3AC) service manuals if exist.

RANDOM: