DOWNLOAD LG 42LH30FD (CHASSIS:LT91A) Service Manual ↓ Size: 5.91 MB | Pages: 74 in PDF or view online for FREE

Model
42LH30FD (CHASSIS:LT91A)
Pages
74
Size
5.91 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh30fd-chassis-lt91a.pdf
Date

LG 42LH30FD (CHASSIS:LT91A) Service Manual ▷ View online

Check technical 
information
- Fix information
- S/W Version
N
Y
Technical 
information?
Check 
input 
signal
Signal
input?
Y
N
External Input and
Component
Recognition error
Check and fix 
external device/cable
RGB,HDMI/
DVI, Optical
Recognition error
Replace Main B/D
Replace Main B/D
Fix in 
accordance 
with technical 
information
D. Function error
External device recognition error 
Established
date 
Electronics 6-3
Revised date 
2008. 3 .05
11/13
LCD  TV
Error
symptom
Standard Repair Process
11
Check 
location of 
noise
Identify 
nose 
type
Circuit 
noise
Replace inverter
Replace LIPS B/D
Mechanical 
noise
Check location 
of noise
OR
※ When the nose is severe, replace the module
(For models with fix information, upgrade the 
S/W or provide the description)
OR
※ If there is a “Tak Tak” noise from the 
cabinet, refer to the KMS fix information and 
then proceed as shown in the solution manual
(For models without any fix information, 
provide the description)
OR
※ Mechanical noise is a natural 
phenomenon, and apply the 1st level 
description. When the customer does not 
agree, apply the process by stage. 
※ Describe the basis of the description 
in “Part related to nose” in the Owner’s 
Manual.
E. Noise 
Circuit noise, mechanical noise
<With Inverter Module>
<Without Inverter Module>
Established
date 
Electronics 6-3
Revised date 
2008. 3 .05
12/13
LCD  TV
Error
symptom
Standard Repair Process
12
Replace module
Zoom part with 
exterior damage
Module
damage
Cabinet
damage
Replace cabinet
Replace remote controller
Remote 
controller
damage
Stand
dent
Replace stand
F. Exterior defect
Exterior defect 
Adjust VCOM
Established
date 
Electronics 6-3
Revised date 
2008. 3 .05
13/13
LCD  TV
Error
symptom
Standard Repair Process
13
LCD TV Repair Process Index
- Trouble shooting by input block (Component level check)
No.
Symptom (L)
Input Block
Page
Remark
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
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