Standard Repair Process Detail Technical Manual
Voltage and speaker checking method
C. Audio error_No audio/Normal video
A21
Established
date
Revised
Error
symptom
Content
LCD TV
2014.02.05
Voltage and speaker checking method
when there is no audio
A21
date
Content
< XXUB98>
1
H_SPK_R-
2
3
H_SPK_L-
4
5
SPK R
6
SPK R+
③
1 PWR
ON
2 DVR_ON
3
P_DIM #1
4
PDIM #2
5 3.5V
6
GND
7
3 5V
8
3 5V
5
SPK_R-
6
SPK_R+
7
SPK_L-
8
SPK_L+
9
C_SPK_R-
10
11
C_SPK_L-
12
②
7
3.5V
8
3.5V
9 GND
10 GND
11 12V
12 12V
13 12V
14 12V
①
15 12V
16
GND
17
GND
18
24V
19
24V
20
24V
21
24V
22
24V
23
GND
24
GND
25
SCLK
26
GND
27
SIN
28
VSYNC
Checking order when there is no audio
①
Check the contact condition of or 24V connector of Main Board
①
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.
A21
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Only for training and service purposes
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Содержание 55UB8500
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