DOWNLOAD LG 42LH3000 / 42LH3010 / 42LH3020 / 42LH3040 (CHASSIS:LD91A) Service Manual ↓ Size: 4.15 MB | Pages: 79 in PDF or view online for FREE

Model
42LH3000 42LH3010 42LH3020 42LH3040 (CHASSIS:LD91A)
Pages
79
Size
4.15 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh3000-42lh3010-42lh3020-42lh3040-chassis-ld91a.pdf
Date
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LG 42LH3000 / 42LH3010 / 42LH3020 / 42LH3040 (CHASSIS:LD91A) Service Manual ▷ View online

LCD TV Repair Process Index
 - Trouble shooting by input block (Component level check)
No.
Symptom (L)
Input Block
Page
Remark
1
Power Problem
Power-up Boot fail
1~2
2
Video Problem
No OSD
3~4
3
Digital TV
5
4
Analog TV
6
5
AV (Scart / CVBS/ S-Video)
7~12
6
Component
13
7
RGB(D-SUB)
14~15
8
HDMI
16~17
9
Audio Problem
All Input
18
10
Digital TV
19
11
Analog TV
20
12
 AV / Component / RGB, HDMI-PC/ HDMI-DTV
21~26
13
AV Audio out / No Audio (Headphone &
SPDIF)
27~30
14
USB / Remocon Problem
USB no connect / Remocon
31~33
15
Intelligent Sensor
Intelligent Sensor
34
P800 Pin #7~#10
Voltage Level = 5V ?
P800 Pin #2
Voltage level = 5V ?
Check Power connector
OK ?
Replace Power Board
YES
NO
YES
P800 Pin #13, 14 = 12V  
P800 Pin #17, 18 = 24V ?
NO
Replace Power Board
YES
NO
Replace MAIN B’D Q801
MAIN B’D L803 = 3.3V ?
Replace MAIN B’D IC801
YES
NO
MAIN B’D L813 = 1.26V ?
Replace MAIN B’D IC805
YES
NO
MAIN B’D L805 = 3.3V ?
Replace MAIN B’D IC806
YES
NO
Check MAIN B’D X100 Clock
12MHz
Replace MAIN B’D IC100
YES
NO
Replace MAIN B’D IC102
NAND FLASH
YES
Replace MAIN B’D IC103
Serial Flash
NO
Replace MAIN B’D 
IC300, IC301 DDR2 Memory
NO
Replace MAIN B’D IC100
NO
Making 
Revision 
2009. 2 . 1
1/34
 LCD TV
Symptom
Power-Up Boot Fail
26~42LH2000
32~47LH3000/LH4000
Check Power connector
OK ?
Replace Power Board
NO
YES
Replace Power Board
NO
Replace MAIN B’D IC801
NO
Replace MAIN B’D IC805
NO
Replace MAIN B’D IC806
NO
Replace MAIN B’D IC100
NO
Replace MAIN B’D IC103
Serial Flash
NO
Replace MAIN B’D 
IC300, IC301 DDR2 Memory
NO
Replace MAIN B’D IC100
NO
Making 
Revision 
2009. 2 . 1
 LCD TV
Symptom
Power-Up Boot Fail
19~22LH2000
2/34
P801 Pin #5~#6
Voltage Level = 5V ?
YES
P801 Pin #1, 2 = 15V?
MAIN B’D L803 = 3.3V ?
YES
MAIN B’D L813 = 1.26V ?
YES
MAIN B’D L805 = 3.3V ?
YES
Check MAIN B’D X100 Clock
12MHz
YES
Replace MAIN B’D IC102
NAND FLASH
YES
P800 Pin #20
Voltage level = 2V 
Check Power connector
OK ?
Replace Power Board
YES
NO
YES
NO
YES
Replace MAIN B’D Q802
MAIN B’D L1300 = 12V ?
Replace MAIN B’D Q806
NO
Replace Main Board
YES
P800 Pin #13, 14 = 12V  
P800 Pin #17, 18 = 24V ?
Check LVDS Cable
OK ?
YES
Replace LVDS Cable
NO
Making 
Revision 
2009. 2 . 1
 LCD TV
Symptom
No OSD
26~42LH2000
32~47LH3000/LH4000
3/34
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