LG 47LN5790 (CHASSIS:LA33B) Service Manual ▷ View online
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Standard Repair Process Detail Technical Manual
Check front display LED
B. Power error _No power
A17
Established
date
Revised
date
Error
symptom
Content
LCD TV
ST-BY condition: On
Power ON condition: Off (but you
can select On by menu)
Front LED control :
Menu Æ Option Æ LG Logo indicator
Æ
Bright / Time
2012. 11 .30
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Standard Repair Process Detail Technical Manual
Check power input voltage and ST-BY 5V
B. Power error _No power
A18
Established
date
Revised
date
Error
symptom
Content
LCD TV
For ’10 models, there is no voltage out for st-by purpose.
When st-by, only 3.5V is normally on.
2012. 11 .30
Check the DC 24V, 12V, 3.5V.
24 Pin
(Power Board ↔ Main Board) -
공통
SMAW200-H18S1 (YEONHO)
1
Power on
2
INV_ON
3
3.5V
4
PDIM #1(PWM Dim #1)
5
3.5V
6
PDIM #2(PWM Dim #2)
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
12V
17
GND
18
GND
19
GND
20
GND
21
GND
22
L/DIM0_VS
23
L/DIM0_MOSI
24
L/DIM0_SCLK
Edge LED
24 Pin
(Power Board ↔ Main Board) -
공통
SMAW200-H18S1 (YEONHO)
1
Power on
2
INV_ON
3
3.5V
4
PDIM #1(PWM Dim #1)
5
3.5V
6
PDIM #2(PWM Dim #2)
7
GND
8
GND
9
24V
10
24V
11
GND
12
GND
13
12V
14
12V
15
12V
16
12V
17
GND
18
GND
19
GND
20
GND
21
GND
22
L/DIM0_VS
23
L/DIM0_MOSI
24
L/DIM0_SCLK
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Standard Repair Process Detail Technical Manual
Checking method when power is ON
B. Power error _No power
A19
Established
date
Revised
date
Error
symptom
Content
LCD TV
Check “power on” pin is high
2012. 11 .30
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Entry method
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>
A22
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 11 .30
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