LG 42LV355T-ZC (CHASSIS:LD11U) Service Manual ▷ View online
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
1
A. Video error_ No video/Normal audio
Check LCD back light with naked eye
A1
2
LED driver B+ 24V measuring method
A2
3
Check White Balance value
A3
4
Power Board voltage measuring method
A4
6
A. Video error_ No video/Video lag/stop
TUNER input signal strength checking method
A6
7
LCD-TV Version checking method
A7
9
A. Video error_Color error
LCD TV connection diagram
A8
10
Tuner Checking Part
A9
11
Check Link Cable (LVDS) reconnection
condition
condition
A10
A11
A10 : Edge LED
A11 : Lamp
12
Adjustment Test pattern - ADJ Key
A12
13
A. Video error_Vertical/Horizontal bar,
residual image, light spot
residual image, light spot
LCD TV connection diagram
A8
14
Check Link Cable (LVDS) reconnection
condition
condition
A10
A11
A10 : Edge LED
A11 : Lamp
15
Adjustment Test pattern - ADJ Key
A12
16
<Appendix>
Defected Type caused by T-Con/
Inverter/ Module
Inverter/ Module
Exchange T-Con Board (1)
A-1/5
17
Exchange T-Con Board (2)
A-2/5
18
Exchange LED driver Board (PSU)
A-3/5
19
Exchange Module itself (1)
A-4/5
20
Exchange Module itself (2)
A-5/5
Continue to the next page
Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
Error symptom
Content
Page
Remarks
21
B. Power error_No power
Check front display LED
A17
22
Check power input Voltage & ST-BY 3.5V
A18
23
Checking method when power is ON
A19
24
POWER BOARD voltage measuring method
A4
25
26
B. Power error_Off when on, off while
viewing
viewing
POWER OFF MODE checking method
A22
27
B. Power error_Off when on, off while
viewing
viewing
POWER BOARD PIN voltage checking
method
method
A19
28
C. Audio error_No audio/Normal video
Checking method in menu when there is no
audio
audio
A24
29
Voltage and speaker checking method when
there is no audio
there is no audio
A25
30
C. Audio error_Wrecked
audio/discontinuation
audio/discontinuation
Voltage and speaker checking method in
case of audio error
case of audio error
A25
31
D. Function error_ No response in
remote controller, key error
remote controller, key error
Remote controller operation checking
method
method
A27
Continued from previous page
Established
date
Standard Repair Process Detail Technical Manual
Revised
date
A1
Error
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.
<ALL MODELS>
LCD TV
A1
2011. 2 .07
Standard Repair Process Detail Technical Manual
LED driver/lamp inverter B+ 24V measuring method
A. Video error_No video/Normal audio
A2
Established
date
Revised
date
Error
symptom
Content
LCD TV
A2
Check the DC 24V, 12V, 3.5V and Inverter on
Edge LED PSU without LED Driver
Lamp (Power Board ↔ Inverter)
-
PSU
14 Pin
1 ~ 5
24V
6 ~ 10
GND
11
Detect
12
Inverter On/Off
13
Int. PWM
14
Ext. PWM (PDIM)
*
26” ~ 47” :
`11 Pin map
Lamp PSU without inverter
2011. 2 .07
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