LG 47LD920 (CHASSIS:LD01I) Service Manual ▷ View online
Replace module
Zoom part with
exterior damage
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
Revised date
2008. 3 .05
13/13
LCD TV
Error
symptom
Standard Repair Process
☞A27
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
1
Check LCD back light with naked eye
A1
2
Inverter B+ 24V measuring method
A2
3
Check inverter PCB supply voltage
A3
4
Check White Balance value
A4
5
A. Video error_ No video/Normal audio
Power Board voltage measuring method
A5
6
TUNER input signal strength checking method
A6
7
A. Video error_ No video/Video lag/stop
LCD-TV Version checking method
A7
9
LCD TV connection diagram (09)
A8
10
Tuner Checking Part
A9
11
Check Link Cable (LVDS) reconnection
condition
condition
A10
A11
A10 : 37/42/47LH4000
A11 : Others
12
A. Video error_Color error
Adjustment Test pattern - ADJ Key
A12
13
LCD TV connection diagram (09)
A13
14
Check Link Cable (LVDS) reconnection
condition
condition
A14
A15
A14 : 37/42/47LH4000
A15 : Others
15
A. Video error_Vertical/Horizontal bar,
residual image, light spot
residual image, light spot
Adjustment Test pattern - ADJ Key
A16
Check front display LED
A17
16
B. Power error_No power
Check power input voltage and ST-BY 5V
A18
17
Checking method when power is ON
A19
18
19
POWER BOARD voltage measuring method
A20
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
20
B. Power error_Off when on, off while
viewing
viewing
POWER OFF MODE checking method
A21
22
B. Power error_Off when on, off while
viewing
viewing
POWER BOARD PIN voltage checking
method
method
A22
23
Checking method in menu when there is no
audio
audio
A23
24
C. Audio error_No audio/Normal video
Voltage and speaker checking method when
there is no audio
there is no audio
A24
29
C. Audio error_Wrecked
audio/discontinuation
audio/discontinuation
Voltage and speaker checking method in
case of audio error
case of audio error
A25
30
D. Function error_ No response in
remote controller, key error
remote controller, key error
Remote controller operation checking
method
method
A26
31
D. VCOM Adjustment
Sequence of the Vcom adjustment
A27
Continued from previous page
Established
date
date
Standard Repair Process Detail Technical Manual
Revised
date
date
2008. 2 . 1
A1
LCD TV
Error
symptom
symptom
Content
Check LCD back light with naked eye
A. Video error_No video/Normal audio
After turning on the power and disassembling the case, check with the naked eye,
whether you can see light from 4 locations.
whether you can see light from 4 locations.
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