Panasonic TX-23LX50F / TX-23LX50P 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 1 fixing screw and hinge cover as shown in
Fig.6.
Remove the 4 fixing screws and the pedestal assembly as shown in
Fig.7.
Remove the 18 fixing screws as shown in
Fig.8.
Remove the back cover.
Fig.5
SCREW
Fig.6
SCREWS
Fig.7
SCREWS
SCREWS
Fig.8
5
CHASSIS BOARD LAYOUT
SETTING INSPECTION
Voltage Confirmation
Confirm the following voltages:
A board
Normal mode
Standby mode
Connector A6, pin 1
5,0V
± 0,5V
0,5V
± 0,2V
C857, + pin
31V
± 3V
2,1V
± 0,5V
C861, + pin
8V
± 0,4V
1V
± 0,25V
IC862, pin 2
2,5V
± 0,3V
2,5V
± 0,3V
C881, + pin
3,3V
± 0,2V
3,3V
± 0,2V
P board
Connector P2, pin 19
24V
± 1V
24V
± 1V
Connector P2, pin 15
15V
± 1V
15V
± 1V
Connector P2, pin 2
1,5V
± 0,2V
<0,1V
P-BOARD
V-BOARD
K-BOARD
A-BOARD
B-BOARD
Board Name
Function
A-Board
Main Board
B-Board
Tuner
K-Board
Mains Input, Power Switch, Key Control
P-Board
Power Supply
V-Board
Speaker Output, Headphone Connector, LED IR, Bats
6
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.
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
---
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
---
TX-23LX50F
OPTION 1
0F
OPTION 2
00
OPTION 3
B0
OPTION 4
11
OPTION 5
00
OPTION 6
15
OPTION 7
FD
OPTION 8
D0
OPTION 9
00
OPTION 10
80
OPTION 11
1B
OPTION 12
00
OPTION 13
0C
CHECK
59
TX-23LX50P
OPTION 1
0F
OPTION 2
00
OPTION 3
B0
OPTION 4
11
OPTION 5
00
OPTION 6
15
OPTION 7
FD
OPTION 8
50
OPTION 9
00
OPTION 10
80
OPTION 11
1B
OPTION 12
00
OPTION 13
0C
CHECK
D9
7
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 0938 0870 0902
Low
Low
0093 0096 0105
Optimum setting.
Sub-Brightness
Sub-Brightness
0
Optimum setting.
8
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