LG 26LH2000 Service Manual

Check Signal format
Is it supported?Check the SCART Cable
YES
Check MAIN B’D JK1100
Replace MAIN B’D JK1100
YES
NO
YES
Check MAIN B’D C200 (RED)
C201 (GREEN)
C202 (BLUE)
Video Signal ?
Replace
MAIN B’D C200, C201, C202
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 2009. 2 . 1
 LCD TV
Symptom
AV1(Scart RGB) No Video
Problem
26~42LH2000
32~47LH3000/LH40008/34
 

Check Signal format
Is it supported?Check the SCART Cable
YES
MAIN B’D JK1101 Check
Replace MAIN B’D JK1101
YES
NO
Check MAIN B’D R1133
Video Signal ?
NO
YES
Check MAIN B’D C211
Video Signal ?
Replace MAIN B’D C211
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 2009. 2 . 1
 LCD TV
Symptom
AV2 No Video Problem
26~42LH2000
32~47LH3000/LH40009/34
 

Check Signal format
Is it supported?Check the CVBS Cable
YES
MAIN B’D JK402 Check
Replace MAIN B’D JK402
YES
NO
Check MAIN B’D R400
Video Signal ?
NO
YES
Check MAIN B’D C217
Video Signal ?
Replace MAIN B’D C217
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 2009. 2 . 1
 LCD TV
Symptom
AV3(CVBS) No Video Problem
26~42LH2000
32~47LH3000/LH400010/34
 

Check Spec (Refer to User Manual)
Is it supported?
Check the SCART Cable
YES
Check the Trouble Shooting Guide
Analog TV No video
YES
Check MAIN B’D R1205
Video Signal ?
NO
Replace MAIN B’D Q1205
YES
Check MAIN B’D C1107
Video Signal ?
NO
MAIN B’D JK1100 Check
YES
Making 
Revision 2009. 2 . 1
11/34
 LCD TV
Symptom
AV1 No Video Out Problem
26~42LH2000
32~47LH3000/LH4000
 

Check Spec (Refer to User Manual)
Is it supported?
Check the SCART Cable
YES
YES
Check MAIN B’D C1122
Video Signal ?
NO
MAIN B’D JK1101 Check
YES
Replace MAIN B’D IC 100
Making 
Revision 2009. 2 . 1
12/34
 LCD TV
Symptom
AV2 No Video Out Problem
26~42LH2000
32~47LH3000/LH4000
 

Check Signal format
Is it supported?
Check the Component Cable
YES
MAIN B’D JK400 Check
Replace MAIN B’D JK400
YES
NO
Check MAIN B’D R419
Video Signal ?
NO
YES
Check MAIN B’D C209, C215 (Y)
C216 (Pb)
C214 (Pr)
Video Signal ?
Replace
MAIN B’D C209 or C214 or C215 or C216
NO
Replace MAIN B’D IC 100
YES
Making 
Revision 2009. 2 . 1
13/34
 LCD TV
Symptom
Component No Video/
No Color Problem
26~42LH2000
32~47LH3000/LH4000
 

Check Signal format
Is it supported?Check the RGB Cable
YES
MAIN B’D P400 Check
Replace MAIN B’D P400
YES
NO
NO
YES
Check MAIN B’D C208 (Video)
R246 (HSYNC)
R245 (VSYNC)
Replace
MAIN B’D C208 or R246 or R247
NO
Replace MAIN B’D IC 100
YES
MAIN B’D P400 Pin #2
Video signal ?
R437 has Vsync ?
R440 has Hsync ?
Making 
Revision 2009. 2 . 1
14/34
 LCD TV
Symptom
RGB No Video Problem
26~42LH2000
32~47LH3000/LH4000
 

Check Signal format
Is it supported?Check the RGB Cable
YES
MAIN B’D P400 Check
Replace MAIN B’D P400
YES
NO
NO
YES
Check MAIN B’D C212 (RED)
C207 (GREEN)
C213 (BLUE)
Video Signal ?
Replace
MAIN B’D C212 or C207 or C213
NO
Replace MAIN B’D IC 100
YES
MAIN B’D P400
 Pin #3 (BLUE)
    Pin #2 (GREEN)
Pin #1 (RED)
Video signal ?
Making 
Revision 2009. 2 . 1
15/34
 LCD TV
Symptom
RGB No Color Problem
26~42LH2000
32~47LH3000/LH4000
 

Check Signal format
Is it supported?Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100Check the ADJUST MENU
EDID OK ?
YES
Download EDID
(Refer to Adjustment Spec)
NO
NO
Replace
MAIN B’D IC107 (HDCP KEY)
Making 
Revision 2009. 2 . 1
16/34
 LCD TV
Symptom
HDMI 1~3 All No Video Problem
HDMI1 – ALL MODELS
HDMI2 – Except for 19/22LH20**
HDMI3 – Except for 19/22LU40**, 19/22LU50**, 19/22LH20**26~42LH2000
32~47LH3000/LH4000
 

Check Signal format
Is it supported?Check the HDMI Cable
YES
YES
Replace MAIN B’D IC 100MAIN B’D JACK Check
JK600 -> HDMI1
JK601 -> HDMI2
JK602 -> HDMI3
YES
_ This case is that HDMI Video doesn’t display at the some HDMI input, not all.
Making 
Revision 2009. 2 . 1
17/34
 LCD TV
Symptom
HDMI1 or 2 or 3 No Video
Problem
HDMI1 – ALL MODELS
HDMI2 – Except for 19/22LH20**
HDMI3 – Except for 19/22LU40**, 19/22LU50**, 19/22LH20**26~42LH2000
32~47LH3000/LH4000