LG 47LA643V (CHASSIS:LD31B) Service Manual ▷ View online
Standard Repair Process Detail Technical Manual
Check power input voltage and ST-BY 3.5V
B. Power error _No power
A12
Established
date
Revised
date
Error
symptom
Content
LCD TV
Check the DC 24V, 12V, 3.5V.
18 Pin
(Power Board ↔ Main Board) -
Common
1
Power on
2
DRV ON
3
3.5V
4
PDIM#1
5
3.5V
6
PDIM#2
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
N.C
17
GND
18
GND
Edge LED
2013. 01 .09
Standard Repair Process Detail Technical Manual
Checking method when power is ON
B. Power error _No power
A13
Established
date
Revised
date
Error
symptom
Content
LCD TV
Check the DC 24V, 12V, 3.5V.
18 Pin
(Power Board ↔ Main Board) -
Common
1
Power on
2
DRV ON
3
3.5V
4
PDIM#1
5
3.5V
6
PDIM#2
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
N.C
17
GND
18
GND
Edge LED
2013. 01 .09
Entry method
1. Press the IN-START button of the remote controller
for adjustment
2. Check the entry into adjustment item 3
1. Press the IN-START button of the remote controller
for adjustment
2. Check the entry into adjustment item 3
Standard Repair Process Detail Technical Manual
POWER OFF MODE checking method
B. Power error
_Off when on, off whiling viewing
<ALL MODELS>
A14
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 01 .09
Standard Repair Process Detail Technical Manual
Checking method in menu when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A15
Established
date
Revised
date
Error
symptom
Content
LCD TV
2013. 01 .09
Checking method
1. Press the MENU button on the remote controller
2. Select the AUDIO function of the Menu
3. Select Sound Out – TV Speaker
*If you set Sound-Out menu as External Speaker/LG Sound Sync, TV Speaker will not work.
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