LG 47LV3500-ZA / 47LV3550-ZB / 47LV355A-ZB / 47LV355C-ZB / 47LV355N-ZB / 47LV355U-ZB (CHASSIS:LD01U) Service Manual ▷ View online
Checking method
1. Press the MENU button on the remote controller
2. Select the AUDIO function of the Menu
3. Select TV Speaker from Off to On
Standard Repair Process Detail Technical Manual
Checking method in menu when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A24
Established
date
Revised
date
Error
symptom
Content
LCD TV
A24
2011. 2 .07
Checking order when there is no audio
① Check the contact condition of 20V or 24V connector of Main Board
② Measure the 24V input voltage supplied from Power Board
(If there is no input voltage, remove and check the connector)
③ Connect the tester RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the
GND and output terminal, the speaker is normal.
GND and output terminal, the speaker is normal.
Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
when there is no audio
when there is no audio
C. Audio error_No audio/Normal video
<ALL MODELS>
A25
Established
date
Revised
date
Error
symptom
Content
LCD TV
A25
①
②
③
2011. 2 .07
Edge LED PSU without LED Driver
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
Analog Tester needle moves slowly, and defective when it does not move at all.
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
<ALL MODELS>
A27
Established
date
Revised
date
Error
symptom
Content
LCD TV
A27
1
2
P2401, P2402
1
EYEQ_SCL
2
EYEQ_SDA
3
GND
4
KEY1
5
KEY2
6
St 3.3V
7
GND
8
LED_B
9
IR
10
GND
11
Normal 3.3V
12
LED_R
13
GND
14
Soft Touch_SCL
15
Soft Touch_SDA
3
4
2011. 2 .07
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the
Analog Tester needle moves slowly, and defective when it does not move at all.
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
<ALL MODELS>
A27
Established
date
Revised
date
Error
symptom
Content
LCD TV
A27
1
2
P2401, P2402
1
EYEQ_SCL
2
EYEQ_SDA
3
GND
4
KEY1
5
KEY2
6
St 3.3V
7
GND
8
LED_B
9
IR
10
GND
11
Normal 3.3V
12
LED_R
13
GND
14
Soft Touch_SCL
15
Soft Touch_SDA
3
4
2011. 2 .07