Panasonic TX-32LXD50 User manual

©2005 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
TX-32LXD50
TX-26LXD50
TX-32LX50F
TX-32LX50P
TX-26LX50F
TX-26LX50P
LH41 Chassis
Wide LCD TV
Specifications
Powe
r
Source
A
C 220 - 240 V, 50
/
60 Hz
Powe
r
Consumption
A
verage use : 133 W (0.78 A) (TX-26LXD50)
A
verage use : 169 W (0.98 A) (TX-32LXD50)
Standb
y
condition :
0.1 W (Without DVB Time
r
programmes)
11W (With DVB Time
r
programmes)
A
verage use : 126 W (TX-26LX50F/P)
A
verage use : 161 W (TX-32LX50F/P)
Standb
y
condition : 0.4 W
LCD Wide XGA (1,366 × 768 pixels)
16 : 9 aspe
c
t ratio LCD panel
Screen Size 575.8 mm (W) × 323.7 mm (H) (TX-26LXD50, TX-26LX50F/P)
697.7 mm (W) × 392.3 mm (H) (TX-32LXD50,TX-32LX50F/P)
Sound
Speake
r
Woofe
r
Ø8 cm × 2 pcs, Full range Ø5 cm ×2pcs
Audio Output 20 W (5.4 W + 5.4 W, 4.6 W + 4.6 W )
Headphones M3 (3.5 mm) Jack × 1
Scanning format 480i(60Hz), 480p(60Hz), 576i(50Hz), 576p(50Hz), 720p(50Hz), 1080i(50Hz)
Receiving Systems
/
PAL I (TX-26L
X
D50/32LXD50) UHF E21-68.
Band name DVB (TX-26L
X
D50/32LXD50) Digital terrestrial services via UHF aerial input.
PAL B, G, H, SEC
A
M B, G SEC
A
ML
/
L’ (TX-26LX50F/P, TX-32L
X
50F/P)
VHF E2 - E12 VHF H1 - H2 (ITALY)
VHF A - H (ITALY) UHF E21 - E69
CATV (S01 - S05) CATV S1 - S10 (M1 - M10)
ORDERNO.PCZ0503030C2

1 Safety Precautions 4
1.1. General Guidelines 4
1.2. Touch-Current Check 4
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
3 Applicable signals 5
4 Self Check Function 6
4.1. Self Check 6
4.2. Power LED Blinking timing chart 7
5 Chassis Board Layout 8
6 Before servicing 9
6.1. Kind and location of the flexible cable and bridge cable 9
6.2. How to remove the connector 10
6.3. Wire dressing 1 11
6.4. Wire dressing 2 12
7 Servicing method 13
7.1. Removing the stand assｴy 13
7.2. Removing the rear cover 13
7.3. Removing the speaker box L and R 13
7.4. Removing the rear AV bracket 14
7.5. Removing the rear metal frame 14
7.6. Removing the P-Board 14
7.7. Removing the XV-Board (For LXD50 model only) 14
7.8. Removing the DG-Board 15
7.9. Removing the AP-Board 15
7.10. Removing the H-Board 15
7.11. Removing G-Board bracket 15
7.12. Removing the G-Board 16
CATV S11 - S20 (U1 - U10) CATV S21 - S41 (Hyperband)
PAL D, K, SEC
A
MD,
K
(TX-26LX50F/P, TX-32L
X
50F/P)
VHF R1 - R2 VHF R3 - R5
VHF R6 - R12 UHF E21 - E69
PAL 525/60 Playback of NTSC tape from some PAL Video re cord
ers (VCR)
M.NTSC Playback from M. NTSC Video recorders (VCR)
NTSC (A
V
input only) Playback from NTSC Video recorders (VCR)
Aerial - Rea
r
UHF (TX-26/32LXD50) UHF/VHF (TX-26/32LX50F
/
P)
Operating Conditions Temperatu
r
e:5°C-35°C
Humidit
y
: 5 % - 90 % RH (non-condensing)
Connection Terminals
AV1 (Sca
r
t connecter) 21 Pin terminal (Audio
/
Video in, Audio
/
Video out, RGB in)
AV2 (Sca
r
t connecter) 21 Pin terminal (Audio
/
Video in, Audio
/
Video out, S-Video in, Q-Link)
AV3
V
IDEO RCA PIN Type × 1
S-
V
IDEO Mini DIN 4-pin
AUDIO L - R RCA PIN Type × 2
AV
4
(Sca
r
t connecter) 21 Pin terminal (Audio
/
Video in, Audio
/
Video out, RGB in, S-Video in, Q-Link)
COMPONENT
V
IDEO Y, P B, PR
AUDIO L - R RCA PIN Type × 2
Output
AUDIO L - R RCA PIN Type × 2
Dimensions ( W × H × D )
Including TV Stand 663 mm × 556 mm × 299.5 mm (TX-26LXD50, TX-26LX50F/P)
795 mm × 634.7 mm × 299.5 mm (TX-32LXD50, TX-32LX50F/P)
TV Set Only 663 mm × 494.3 mm × 140.7 mm (TX-26LXD50, TX-26LX50F/P)
795 mm × 573 mm × 140.7 mm (TX-32LXD50, TX-32LX50F/P)
Mass (Weight) 18 kg Net (TX-26LXD50, TX-26LX50F/P)
21 kg Net (TX-32LXD50, TX-32LX50F/P)
CONTENTS
Page Page
2
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

7.13. Removing the K-Board 16
7.14. Removing the V-Board 16
7.15. Removing the main chassis 16
7.16. Removing the LCD panel 17
8 Service Mode Function 18
8.1. How to enter SERVICE 1 18
8.2. How to enter SERVICE 2 18
8.3. Option Description 21
8.4. Option Code Setting 23
9 Adjustment method 24
9.1. White Balance Adjustment 24
10 Block Diagram 25
10.1. Signal (1/3) Block Diagram 25
10.2. Signal (2/3) Block Diagram 26
10.3. Signal (3/3) Block Diagram 27
10.4. Power (1/3) Block Diagram 28
10.5. Power (2/3) Block Diagram 29
10.6. Power (3/3) Block Diagram 30
11 Schematic Diagram 31
11.1. Schematic Diagram Notes 31
11.2. AP-Board (1/2) and K-Board Schematic Diagram 32
11.3. AP-Board (2/2) Schematic Diagram 33
11.4. XV-Board (1/5) Schematic Diagram 34
11.5. XV-Board (2/5) Schematic Diagram 35
11.6. XV-Board (3/5) Schematic Diagram 36
11.7. XV-Board (4/5) Schematic Diagram 37
11.8. XV-Board (5/5) Schematic Diagram 38
11.9. H-Board (1/3) Schematic DIagram 39
11.10. H-Board (2/3) Schematic Diagram 40
11.11. H-Board (3/3) Schematic Diagram 41
11.12. DG-Board (1/6) Schematic Diagram 42
11.13. DG-Board (2/6) Schematic Diagram 43
11.14. DG-Board (3/6) Schematic Diagram 44
11.15. DG-Board (4/6) Schematic Diagram 45
11.16. DG-Board (5/6) Schematic Diagram 46
11.17. DG-Board (6/6) Schematic Diagram 47
11.18. G-Board and V-Board Schematic Diagram 48
12 Printed Circuit Board 49
12.1. AP-Board 49
12.2. XV-Board (TX-26/32LXD50 only) 51
12.3. H-Board 53
12.4. DG-Board 56
12.5. G-Board 59
12.6. K-Board and V-Board 60
13 Exploded View and Replacement Parts List. 61
13.1. Set Layout 61
13.2. Front Chassis Layout 62
13.3. Packing Exploded View 63
13.4. Mechanical Replacement Parts List 64
14 Electrical Replacement Parts List 66
14.1. Electrical Replacement Parts List Notes 66
14.2. Electrical Replacement Parts List (TX-32/26LXD50) 67
14.3. Electrical Replacement Parts List (TX-32/26LX50F/P) 85
3
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

1.2. Touch-Current Check
1 Safety Precautions
1.1. General Guidelines
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground such
as a water pipe, as shown in Figure 1.
3. Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reserve the AC plug in the AC outlet and repeat each of the above measure.
6. The potential at any point (TOUGH CURRENT) expressed as voltage U1and U2, does not exceed the following values:
For a. c.: U1= 35 V (peak) and U2= 0.35 V (peak);
For d. c.: U1= 1.0 V,
Note:
The limit value of U2= 0.35 V (peak) for a. c. and U1= 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and 2.0
mA d. c.
The limit value U1= 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.
7. In case a measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be
repaired and rechecked before it is returned to the customer.
Figure 1
4
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage
caused by electro static discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alminum
foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static (ESD protected)" can
generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, alminum foil or comparable
conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise hamless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to
damage an ES device).
3 Applicable signals
Applicable input signal for Component (Y, PB,P
R)
Note:
Signals without above specification may not be displayed properly.
5
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

4 Self Check Function
4.1. Self Check
1. Self-Check is used to automatically check the bus lines and hexadecimal code of the TV set.
2. To get into the Self -Check mode press the Down () button on the customer controls at the front of the set, at the same
time pressing the Status/Information ( )button on the remote control, and the screen will show :
3. Turn off the TV to reset JPEG Viewer circuit after SELF-CHECK.
If the CCU ports have been checked and found to be incorrect or not located then “--” will appear in place of “O.K.”.
Display Ref. No. Description P.C.B.
MEM IC1107 Memory DG-Board
GC4P IC4054 Global Core DG-Board
GC4L IC4057 Global Core DG-Board
HAD IC4012 OSD RGB A/D Converter DG-Board
AVSW1 IC3005 AV Switch VIDEO H-Board
AVSW2 IC2105 AV Switch AUDIO H-Board
Tun1 TU3201 Tuner H-Board
DAC1 IC1106 DAC control 1 DG-Board
DAC3 IC3006 DAC control 3 H-Board
MSP IC2106 Stereo Decoder H-Board
IPC IC8013 HDSL PEAKS Lite XV-Board
ADV IC4005 A/D Converter DG-Board
6
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

4.2. Power LED Blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When an abonormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the
defective block can be identified by the number of blinking of the Power LED on the front panel of the unit.
7
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

5 Chassis Board Layout
Board Name Function
AP-Board Regulator
DG-Board Global Core, A/D Converter, MCU
H-Board AV connector, TV Tuner, AV Switch
K-Board Power Switch
G-Board Front AV & HP connector, Key Switch
P-Board DC Power Supply
V-Board Remote Receiver, LED
XV-Board DVB Tuner
8
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

6 Before servicing
6.1. Kind and location of the flexible cable and bridge cable
Ref No. Connecter type Pins Location Opposite Ref No.
G1 - 10pin G-Board V1
G4 - 30pin G-Board H4
G5 - 20pin G-Board H5
G10 - 4pin G-Board speaker box L
G11 - 5pin G-Board speaker box R
AP1 Bridge Type 23pin AP-Board H1
AP2 - 7pin AP-Board P5 (CN101)
AP3 Bridge Type 11pin AP-Board P3
AP4 Bridge Type 22pin AP-Board DG4
AP5 Bridge Type 22pin AP-Board DG5
AP6 - 3pin AP-Board K6
DG3 Flexible type 40pin DG-Board H3
DG4 Bridge type 23pin DG-Board AP4
DG5 Bridge type 23pin DG-Board AP5
DG6 - 8pin DG-Board LCD Panel
DG7 - 32pin DG-Board LCD Panel
H1 Bridge type 23pin H-Board AP1
H4 - 30pin H-Board G4
H5 - 20pin H-Board G5
H3 Flexible type 40pin H-Board DG3
AP10 - 2pin AP-Board AC cord
K6 - 3pin K-Board AP6
P1 (CN203) - 8pin P-Board CN1 (Inverter)
P2 (CN101) - 7pin P-Board AP2
P3 (CN201) Bridge Type 11pin P-Board AP3
V1 - 10pin V-Board G1
9
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P

Bridge cable connector
Flexible cable connector
6.2. How to remove the connector
10
TX-32LXD50 / TX-26LXD50 / TX-32LX50F / TX-32LX50P / TX-26LX50F / TX-26LX50P