LG 55LN5100 (CHASSIS:LA33B) Service Manual ▷ View online
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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 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
POWER OFF MODE checking method
A22
27
B. Power error_Off when on, off while
viewing
POWER BOARD PIN voltage checking method
A19
28
C. Audio error_No audio/Normal video
Checking method in menu when there is no
audio
A24
29
Voltage and speaker checking method when
there is no audio
A25
30
C. Audio error_Wrecked
audio/discontinuation
Voltage and speaker checking method in case of
audio error
A25
31
D. Function error_ No response in remote
controller, key error
Remote controller operation checking method
A27
32
D. VCOM Adjustment
Sequence of the Vcom adjustment
A28
Continued from previous page
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Standard Repair Process Detail Technical Manual
Check White Balance value
A. Video error_No video/Normal audio
<ALL MODELS>
A4
Established
date
Revised
date
Error
symptom
Content
LCD TV
Entry method
1. Press the ADJ button on the remote controller for adjustment.
2. Enter into White Balance of item 9.
3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), re-
enter the value after replacing the MAIN BOARD.
2012. 11 .30
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Standard Repair Process Detail Technical Manual
Power Board voltage measuring method
A. Video error_No video/ Audio
A5
Established
date
Revised
date
Error
symptom
Content
LCD TV
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
2012. 11 .30
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MENU -Æ Channel
Æ
Manual -Æ select channel
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
Standard Repair Process Detail Technical Manual
TUNER input signal strength checking method
A. Video error_Video error, video lag/stop
<ALL MODELS>
A6
Established
date
Revised
date
Error
symptom
Content
LCD TV
2012. 11 .30
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