DOWNLOAD LG 37LH50YD (CHASSIS:LB91B) Service Manual ↓ Size: 4.92 MB | Pages: 66 in PDF or view online for FREE

Model
37LH50YD (CHASSIS:LB91B)
Pages
66
Size
4.92 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37lh50yd-chassis-lb91b.pdf
Date
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LG 37LH50YD (CHASSIS:LB91B) Service Manual ▷ View online

Check Signal format
Is it supported?
Check the Component Cable
YES
MAIN B’D JK402 Check
Replace MAIN B’D JK402
YES
NO
Check MAIN B’D R422
Video Signal ?
NO
YES
Check MAIN B’D C214, C209 (Y)
C215 (Pb)
C216 (Pr)
Video Signal ?
Replace
MAIN B’D C214 or C209 or C215 or C216
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 
2009. 2 . 1
8/25
LCD TV
Symptom
Component2 No Video/ 
No Color Problem
Check Signal format
Is it supported?
Check the RGB Cable
YES
MAIN B’D JK405 Check
Replace MAIN B’D JK405
YES
NO
NO
YES
Check MAIN B’D C207 (Video)
R2030 (HSYNC)
R2031 (VSYNC)
Replace
MAIN B’D C207 or R2030 or R2031
NO
Replace MAIN B’D IC 100
YES
MAIN B’D JK405 Pin #2
Video signal ?
R446 has Vsync ?
R447 has Hsync ?
Making 
Revision 
2009. 2 . 1
9/25
LCD TV
Symptom
RGB No Video Problem
Check Signal format
Is it supported?
Check the RGB Cable
YES
MAIN B’D JK405 Check
Replace MAIN B’D JK405
YES
NO
NO
YES
Check MAIN B’D C2016 (RED)
C2017 (GREEN)
C2018 (BLUE)
Video Signal ?
Replace
MAIN B’D C2016 or C2017 or C2018
NO
Replace MAIN B’D IC 100
YES
MAIN B’D JK405
Pin #3 (BLUE)
Pin #2 (GREEN)
Pin #1 (RED)
Video signal ?
Making 
Revision 
2009. 2 . 1
10/25
LCD TV
Symptom
RGB No Color Problem
Check Signal format
Is it supported?
Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100
Check the ADJUST MENU
EDID OK ?
YES
Download EDID
(Refer to Adjustment Spec)
NO
NO
Replace
MAIN B’D IC601 (HDCP KEY)
Making 
Revision 
2009. 2 . 1
11/25
LCD TV
Symptom
HDMI 1~4 All No Video Problem
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