Panasonic TX-20LA5F / TX-20LA5P (serv.man3) Service Manual ▷ View online
SERVICE HINTS
HOW TO REMOVE THE BACK COVER
Lay the main unit face down as shown in
Fig.5.
Remove the 4 fixing screws as shown in
Fig.6.
Remove the stand assembly.
Remove the 8 fixing screws as shown in
Fig.7.
Remove the back cover.
SCREWS
SCREWS
SCREWS
5
Fig.5
Fig.6
Fig.7
SETTING INSPECTION
VOLTAGE CONFIRMATION
Confirm the following voltages:
A board
Normal mode
Standby mode
Connector A6, pin 1
5,0V
± 0,2V
<0,3V
C865, + pin
31V
± 3V
<3V
C861, + pin
8V
± 0,4V
<0,55V
C862, + pin
2,5V
± 0,2V
2,5V
± 0,2V
C889, + pin
3,3V
± 0,2V
3,3V
± 0,2V
C882, + pin
1,8V
± 0,1V
<0,2V
P board
Connector P4, pin 19
23V
± 0,25V
23V
± 0,25V
Connector P4, pin 15
12,5V
± 0,25V
12,5V
± 0,25V
Connector P4, pin 2
1,4V
± 0,1V
<0,5V
SELF CHECK
Self-check is used to automatically check the bus lines and hexadecimal code of the TV set. To enter Self-Check mode, keep
pressing the STATUS button on the remote control and press the down (-/v) button on the customer controls at the front
the TV set. To exit Self Check, switch off the TV set at the power button.
pressing the STATUS button on the remote control and press the down (-/v) button on the customer controls at the front
the TV set. To exit Self Check, switch off the TV set at the power button.
If the CCU ports have been checked and found to be incorrect or not located then " - - " will appear in place of "O.K.".
E2
O.K.
DPS
O.K.
VSP
O.K.
AVSW
O.K.
TUN
O.K.
MSP
O.K.
DPL
---
MAS
---
OPTION 1
0F
0F
OPTION 2
00
00
OPTION 3
A0
A0
OPTION 4
11
11
OPTION 5
00
00
OPTION 6
15
15
OPTION 7
FD
FD
OPTION 8
D0
50
OPTION 9
00
00
OPTION 10
80
80
OPTION 11
1B
1B
OPTION 12
00
00
OPTION 13
0C
0C
CHECK
49
C9
6
TX-20LA5F
TX-20LA5P
Display
Ref. No.
Description
P.C.B.
E2
IC1101
EAROM
A-Board
DPS
IC1700
DISPLAY PROCESSOR AND SCALER
A-Board
VSP
IC1500
VIDEOSIGNAL PROCESSOR
A-Board
AVSW
IC1500
AV SWITCH
A-Board
TUN
TNR001
TUNER
B-Board
MSP
IC2000
MULTISTANDART SOUND PROCESSOR
A-Board
DPL
---
DOLBY PROLOGIC PROCESSOR
---
MAS
---
MPEG1 AUDIO PROCESSOR
---
ALIGNMENT SETTINGS
(The figures below are nominal and used for representative purposes only.)
1. Set the Bass to maximum position, set the Treble to minimum position then keep pressing the INDEX button on the
1. Set the Bass to maximum position, set the Treble to minimum position then keep pressing the INDEX button on the
remote control and press the down button (-/v) on the customer controls at the front of the TV, this will place the TV into
the Service Mode 1.
the Service Mode 1.
2. Press the RED / GREEN buttons to step up / down through the functions.
3. Press the YELLOW / BLUE buttons to alter the function values.
4. Press the OK button after each adjustment has been made to store the required values.
5. To exit the Service Mode, press the "N" button.
3. Press the YELLOW / BLUE buttons to alter the function values.
4. Press the OK button after each adjustment has been made to store the required values.
5. To exit the Service Mode, press the "N" button.
Alignment Function
Setting indication
Note: All setting values are approximate
Settings / Special features
Horizontal Position
H-Pos
0
Optimum setting.
Vertical Position
V-Pos
0
Optimum setting.
DVCO
DVCO
3
Receive a PAL Colour Bar Pattern. For
DVCO alignment press "Blue" button, wait
until the figure colour is changed from red
to black colour.
Highlight
Lowlight
High 0885 0851 0954
Low
Low
0060 0096 0062
Optimum setting.
Sub-Brightness
Sub-Brightness
0
Optimum setting.
7
VIDEO & STEREO AUDIO BLOCK DIAGRAM
IC2000
67
SIF
MSP3410GAB83
AV1 L I
N
56
AV
1 L OUT
1 L OUT
37
AV1 R
IN
57
60
AM IN
JK2350
R
L
HEADPH
1 7 6 2 3 4 5
AV1 21 PIN SCART
20
VIDEO
IN
15
R IN
11
G I
N
N
19
V
IDE
O OUT
O OUT
7
B IN
6
L IN
3
L OUT
2
R IN
1
R OUT
AV1 R
OUT
36
AV2 L I
N
50
AV2 R
IN
51
SPK R
O
U
T
27
SPK L
O
U
T
28
TUNER
17
14
L
R
Z2
3
4
IC250
TDA1517N3
1
L IN
9
R IN
L OUT
4
R OUT
6
IC1500
AV1C
VB
S
S
53
VSP9405BVKC4
61
TX
T CV
T CV
BS
AV2 V
57
AV2 C
56
52
TVCVBS
AV2 Y
55
AV1 V
OUT
63
B EXT
41
G
EXT
40
R EXT
39
2
1
3
Z1
5
R2351
R2350
11
9
A12
11
9
B1
3
A2
5
Q202
Q201
JK300
0
V L R
AV2 terminal
C Y
IC1100
SDA5550M
21
TXT CVBS
AD_65
6.0
÷
÷
AD_656.7
IC1700
DPS9450A
OSD R IN1
131
OSD G IN1
132
OSD B IN1
133
57
OSD R
58
OSD G
59
OSD B
Q1500
Q1502
AD_656.0
÷ AD_656.7
8
8
13
B - BOARD
A - BOARD
Z - BOARD
TO LCD
PA
NEL
NEL
A50
R1.0
÷ R1.7
G1.0
÷ G1.7
B1.0
÷ B1.7
19
IC1701
48
TX0-
47
TX0+
46
TX1-
45
TX1+
42
TX2-
41
TX2+
38
TX3-
37
TX3+
B1.0
÷ B1.7
G1.0
÷ G1.7
R1.0
÷ R1.7
17
15
15
13
11
11
9
3
1
1
LVDS DRIVER
8
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