DOWNLOAD LG 55SL80YD-AA (CHASSIS:LB91T) Service Manual ↓ Size: 4.86 MB | Pages: 66 in PDF or view online for FREE

Model
55SL80YD-AA (CHASSIS:LB91T)
Pages
66
Size
4.86 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55sl80yd-aa-chassis-lb91t.pdf
Date
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LG 55SL80YD-AA (CHASSIS:LB91T) 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
1 
Power Problem
Power up Boot fail
1 2
2   
No OSD
3~4
3
Digital TV
5
Video Problem
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
All Input
18
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
14
USB / Remocon Problem
USB no connect / Remocon 
31~33
15
Intelligent Sensor
Intelligent Sensor
34
Making 
Revision
2009. 2 . 1
1/25
LCD TV
Symptom
Power-Up Boot Fail
P800 Pin #7~#10
Voltage Level = 5V ?
Check Power connector
OK ?
Replace Power Board
NO
YES
Revision 
P800 Pin #2
Voltage level = 5V ?
YES
NO
YES
Replace MAIN B’D Q801
P800 Pin #13, 14 = 12V  
P800 Pin #17, 18 = 24V ?
Replace Power Board
YES
NO
YES
MAIN B’D L815 = 3.3V ?
Replace MAIN B’D IC804
NO
YES
MAIN B’D L816 = 1.26V ?
Replace MAIN B’D IC805
NO
MAIN B’D L809 = 1.8V ?
Replace MAIN B’D IC807
YES
NO
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
LCD TV
Symptom
No OSD
2/25
Check Power connector
OK ?
Replace Power Board
P800 Pin #13, 14 = 12V  
P800 Pi  #17  18   24V ?
Revision 
P800 Pin #20
Voltage level = 2V ↑
OK ?
Replace Power Board
YES
NO
YES
NO
Replace MAIN B’D Q802
P800 Pin #17, 18 = 24V ?
NO
YES
MAIN B’D L810 = 12V ?
Replace MAIN B’D Q805
NO
YES
Replace Main Board
YES
Check LVDS Cable
OK ?
YES
NO
Replace LVDS Cable
Making 
Revision
2009. 2 . 1
LCD TV
Symptom
Digital TV Video Problem
3/25
Check RF Cable
Revision 
MAIN B’D L1111 = 5V ?
YES
NO
YES
Replace MAIN B’D IC808
MAIN B’D L1112 = 3.3V ?
Replace MAIN B’D IC1103
YES
NO
YES
MAIN B’D L1113 = 1.8V ?
Replace MAIN B’D IC1105
NO
YES
MAIN B’D X1101 Clock ?
NO
Replace MAIN B’D X1101
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