Panasonic TH-37PD25U/P User manual

© 2004 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
TH-37PD25U-P
TH-42PD25U-P
GP6DU-DTV Chassis
Digital Progressive Plasma Television
Specifications
Power Source AC 120 V, 50/60 Hz
Power Consumption Maximum :395 W (TH-42PD25U/P), 345W (TH-37PD25U/P)
Stand-by condition :0.8 W
Plasma Display panel Drive method :AC type 42-inch, 16 :9 aspect ratio (TH-42PD25U/P)
Drive method :AC type 37-inch, 16 :9 aspect ratio (TH-37PD25U/P)
Screen Size 36.22 “ (920 mm) (W) × 20.39 “ (518 mm) (H) × 41.57 “ (1056 mm) (diagonal) (TH-42PD25U/P)
32.20 “ (818 mm) (W) × 18.15 “ (461 mm) (H) × 36.97 “ (939 mm) (diagonal) (TH-37PD25U/P)
Dimensions
(W × H × D )
46.06 “ (1170mm) × “ 29.91 “ (658 mm) × 3.90 “ (99 mm) (TH-42PD25U/P)
42.13 “ (1070mm) × “ 23.46 “ (596 mm) × 3.90 “ (99 mm) (TH-37PD25U/P)
Mass (Weight) 79.4 lb.(36.0 kg)Net (TH-42PD25U/P)
67.2 lb.(30.5 kg)Net (TH-37PD25U/P)
Channel Capability-ATSC/NTSC VHF/UHF: 2-69, CATV: 1-136
Sound
Speaker Woofer 1.57 “ (40 mm) × 8 , Tweeter 1.38 “ (35 mm) ×2
Audio Output 16W[8W+8W](10%THD)
Headphone M3 (3.5 mm) Jack × 1
FEATURES Two screen display fuctions 3DY/CFILTERHDMI
BBE VIVA 3D LINEAR PIP JPEG Viewer
CLOSED CAPTION
V
-Chip
Accessories Supplied Remote control Transmitter EUR7627Z10
AA Battery × 2 Ferrite cores (large × 4, small × 6)
AC Cord F type Antenna Adaptor (3C-2V × 2, 5C-2V × 2)
Pedestal Fixing band
Operating Conditions Temperature : 34 °F - 104 °F (0° - 40°C)
Humidity : 20 % - 80 % (non-condensing)
Connection Terminals RGB input D-SUB 15pin R, G, B /0.7 Vp-p (759)
HD, VD /1.0 -5.0 Vp-p (high impedance)
AV INPUT 1-3
V
IDEO
(Phono Jack Type)
1.0 Vp-p (759)
ORDER NO. ITD0404011C1
B19 Canada: B07

1 Applicable signals 4
2 Safety Precautions 5
2.1. General Guidelines 5
3 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 6
4 About lead free solder (PbF) 7
5 Service Hint 8
6 Plasma panel replacement method 9
7 Location of Lead Wiring 14
7.1. Lead of Wiring (1) 14
7.2. Lead of Wiring (2) 15
7.3. Lead of Wiring (3) 16
7.4. Lead of Wiring (4) 17
8 Self-check Function 18
8.1. Self-check of the microcomputer control system (bus line)
18
8.2. Power LED Blinking timing chart 19
8.3. No Power 20
8.4. No Picture 21
8.5. Local screen failure 21
9 Serviceman Mode (Electronic Controls) 22
10 CAT (computer Aided Test) mode 25
10.1. IIC mode 25
10.2. CD mode 26
10.3. SD mode 26
10.4. IIC mode structure (following items value is sample data.)
27
11 Adjustment Procedure 28
11.1. +B Set-up 28
11.2. Driver Set-up 28
11.3. Initialization Pulse Adjust 29
11.4. P.C.B. (Printed Circuit Board) exchange 30
11.5. Adjustment Volume Location 30
11.6. Test Point Location 30
12 Adjustment 31
12.1. Pedestal setting 31
12.2. NTSC panel white balance 32
12.3. HD panel white balance 33
12.4. Sub brightness setting 34
13 Hotel mode 35
14 Conductor Views 37
14.1. PF-Board 37
14.2. P-Board 39
14.3. PA-Board 42
14.4. TB and JA-Board 44
14.5. H-Board 45
14.6. DG-Board 47
14.7. DV-Board 49
S-VIDEO
(Mini DIN 4-pin)
Y :1.0 Vp-p (759), C : 0.286 Vp-p
(759)
A
UDIO L-R
(Phono Jack Type × 2)
0.5 Vrms
AV PROG.OUT
V
IDEO
(Phono Jack Type)
1.0 Vp-p (759)
A
UDIO L-R
(Phono Jack Type × 2)
0.5 Vrms
TO AUDIO AMP
A
UDIO L-R
(Phono Jack Type × 2)
0.5 Vrms
COMPONENT VIDEO Y1.0 Vp-p (including synchronization)
INPUT1-2 PB /PR ±0.35Vp-p
A
UDIO L-R
(Phono Jack Type × 2)
0.5 Vrms
HDMI HDMI type A Connector
A
UDIO L-R
(Phono Jack Type × 2)
0.5 Vrms
DIGITAL AUDIO OUT PCM/Dolby Digital, Fiber Optic
Note:
Design and Specifications are subject to change without notice.Weight and Dimensions shown are approximate.
CONTENTS Page Page
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TH-37PD25U-P / TH-42PD25U-P

14.8. D-Board 50
14.9. C1-Board (For TH-37PD25U/P) 52
14.10. C1-Board (For TH-42PD25U/P) 53
14.11. C2-Board (For TH-37PD25U/P) 54
14.12. C2-Board (TH-42PD25U/P) 55
14.13. SC-Board 56
14.14. SU-Board (For TH-37PD25U/P) 59
14.15. SU-Board (For TH-42PD25U/P) 60
14.16. SD-Board (For TH-37D25U/P) 61
14.17. SD-Board (For TH-42D25U/P) 62
14.18. SS Board 63
14.19. SS2, SS3, SS4 and SS5-Board 65
14.20. K-Board 66
14.21. G-Board 68
14.22. DT-Board (PAVCA SUPPLYED) 69
15 Block and Schematic Diagrams 71
15.1. Schematic Diagram Notes 71
15.2. PF-Board Block Diagram 72
15.3. PF-Board Schematic Diagram 73
15.4. P-Board Block Diagram 74
15.5. P-Board Schematic Diagram 75
15.6. PA-Board Block Diagram 76
15.7. PA-Board (1 of 3) Schematic Diagram 77
15.8. PA-Board (2 of 3) Schematic Diagram 78
15.9. PA-Board (3 of 3) Schematic Diagram 79
15.10. DT and JA-Board Block Diagram 80
15.11. DT-Board (1 of 8) Schematic Diagram 82
15.12. DT-Board (2 of 8) Schematic Diagram 83
15.13. DT-Board (3 of 8) Schematic Diagram 84
15.14. DT-Board (4 of 8) Schematic Diagram 85
15.15. DT-Board (5 of 8) Schematic Diagram 86
15.16. DT-Board (6 of 8) Schematic Diagram 87
15.17. DT-Board (7 of 8) Schematic Diagram 88
15.18. DT-Board (8 of 8) Schematic Diagram 89
15.19. JA and TB-Board Schematic Diagram 90
15.20. H and TB-Board Block Diagram 91
15.21. H-Board (1 of 2) Schematic Diagram 92
15.22. H-Board (2 of 2) Schematic Diagram 93
15.23. DG-Board Block Diagram 94
15.24. DG-Board (1 of 7) Schematic Diagram 96
15.25. DG-Board (2 of 7) Schematic Diagram 97
15.26. DG-Board (3 of 7) Schematic Diagram 98
15.27. DG-Board (4 of 7) Schematic Diagram 99
15.28. DG-Board (5 of 7) Schematic Diagram 100
15.29. DG-Board (6 of 7) Schematic Diagram 101
15.30. DG-Board (7 of 7) Schematic Diagram 102
15.31. DV-Board Block Diagram 103
15.32. DV-Board (1 of 3) Schematic Diagram 104
15.33. DV-Board (2 of 3) Schematic Diagram 105
15.34. DV-Board (3 of 3) Schematic Diagram 106
15.35. D-Board Block Diagram 107
15.36. D-Board (1 of 12) Schematic Diagram 108
15.37. D-Board (2 of 12) Schematic Diagram 109
15.38. D-Board (3 of 12) Schematic Diagram 110
15.39. D-Board (4 of 12) Schematic Diagram 111
15.40. D-Board (5 of 12) Schematic Diagram 112
15.41. D-Board (6 of 12) Schematic Diagram 113
15.42. D-Board (7 of 12) Schematic Diagram 114
15.43. D-Board (8 of 12) Schematic Diagram 115
15.44. D-Board (9 of 12) Schematic Diagram 116
15.45. D-Board (10 of 12) Schematic Diagram 117
15.46. D-Board (11 of 12) Schematic Diagram 118
15.47. D-Board (12 of 12) Schematic Diagram 119
15.48. C1, C2, G, and K-Board Block Diagram 120
15.49. C1-Board Schematic Diagram (TH-37PD25U/P) 121
15.50. C1-Board Schematic Diagram (TH-42PD25U/P) 122
15.51. C2-Board (1 of 2) Schematic Diagram (TH-37PD25U/P)
123
15.52. C2-Board (2 of 2) Schematic Diagram (TH-37PD25U/P)
124
15.53. C2-Board Schematic Diagram (TH-42PD25U/P) 125
15.54. K-Board (1 of 2) Schematic Diagram 126
15.55. K-Board (2 of 2) Schematic Diagram 127
15.56. G-Board Schematic Diagram 128
15.57. SC-Board Block Diagram 129
15.58. SC-Board (1 of 3) Schematic Diagram 130
15.59. SC-Board (2 of 3) Schematic Diagram 131
15.60. SC-Board (3 of 3) Schematic Diagram 132
15.61. SU-Board Block Diagram 133
15.62. SU-Board Schematic Diagram (TH-37PD25U/P) 134
15.63. SU-Board Schematic Diagram (TH-42PD25U/P) 135
15.64. SD-Board Block Diagram 136
15.65. SD-Board Schematic Diagram (TH-37PD25U/P) 137
15.66. SD-Board Schematic Diagram (TH-42PD25U/P) 138
15.67. SS, S, SS2, SS3, SS4 and SS5-Board Block Diagram 139
15.68. SS-Board (1 of 2) and S-Board Schematic Diagram 140
15.69. SS-Board (2 of 2) SS2, SS3, SS4 and SS5-Board
Schematic Diagram 141
16 Parts Location & Mechanical Replacement Parts List 143
16.1. Parts Location 143
16.2. Packing Exploded Views (1) 144
16.3. Packing Exploded Views (2) 145
16.4. Packing Exploded Views (3) 146
16.5. Mechanical Replacement Parts List 147
17 Replacement Parts List 148
17.1. Replacement Parts List Notes 148
17.2. Electrical Replacement Parts List 149
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TH-37PD25U-P / TH-42PD25U-P

1 Applicable signals
4
TH-37PD25U-P / TH-42PD25U-P

2.1.1. Leakage Current Cold Check
1.Unplug the AC cord and connect a jumper between the two
prongs on the plug.
2.Measure the resistance value, with an ohmmeter, between
the jumpered AC plug and each exposed metallic cabinet
part on the equipment such as screwheads, connectors,
control shafts, etc. When the exposed metallic part has a
return path to the chassis, the reading should be between
1M9and 5.2M9.
When the exposed metal does not have a return path to
the chassis, the reading must be .
Figure 1
2.1.2. Leakage Current Hot Check (See
Figure 1.)
1.Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2.Connect a 1.5k9, 10 watts resistor, in parallel with a 0.15µF
capacitors, 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 an AC voltmeter, with 1000 ohms/volt or more
sensitivity, to measure the potential across the resistor.
4.Check each exposed metallic part, and measure the
voltage at each point.
5.Reverse the AC plug in the AC outlet and repeat each of the
above measurements.
6.The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current must not exceed 1/2 milliamp. In case a
measurement is outside 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.
2 Safety Precautions
2.1. 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.
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TH-37PD25U-P / TH-42PD25U-P

3 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).
6
TH-37PD25U-P / TH-42PD25U-P

4 About lead free solder (PbF)
Note: Lead is listed as (Pb) in the periodic table of elements.
In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.
The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu).
That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.
This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d
suggest the use of Pb free solder as well, although Pb solder may be used.
PCBs manufactured using lead free solder will have the PbF within a leaf Symbol stamped on the back of PCB.
Caution
·
· ·
· Pb free solder has a higher melting point than standard solder. Typically the melting point is 50 ~ 70 °F (30~40 °C) higher.
Please use a high temperature soldering iron and set it to 700 ± 20 °F (370 ± 10 °C).
·
· ·
· Pb free solder will tend to splash when heated too high (about 1100 °F or 600 °C).
If you must use Pb solder, please completely remove all of the Pb free solder on the pins or solder area before applying Pb
solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.
·
· ·
· After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto
the opposite side. (see figure below)
Suggested Pb free solder
There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder.
However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.
7
TH-37PD25U-P / TH-42PD25U-P

5 Service Hint
Board Name Function Board Name Function
C1 DATA DRIVER (RIGHT) PF LINE FILTER
C2 DATA DRIVER (LEFT) SC SCAN DRIVE
DDIGTAL SIGINAL PROCESS SD SCAN OUT (DOWN)
DG DIGTAL CORE MICOM SS SUSTAIN DRIVE
GFRONT TERMINAL, SWITCH SS2 SUSTAIN CONNECTION (UP)
HREAE TERMINAL SS3 SUSTAIN CONNECTION (DOWN)
KLED, REMOTE, POWER SWITCH SU SCAN OUT (UP)
PPOWER SUPPLY TA ANALOG TUNER
PA DC/DC, AUDIO DT DIGITAL TUNER
DV HDMI INTERFACE JA INTERFACE
Note:
DT-Board is PAVCA supplyed.
8
TH-37PD25U-P / TH-42PD25U-P

n
nn
nTo replace the plasma panel (finished), place the unit on
the servicing stand, remove the front frame (finished), and
attach the panel, being careful not to scratch the plasma
panel surface.
1.Remove the rear cover.
2.Remove the P board.
a.Remove the couplers (P2, P5, P9, P11, P12, P23, P25,
P27) connected to the P board.
b.Remove the P board fastening screws (×5) and remove
the P board.
3.Remove the PA board.
a.Remove the couplers (PA2, PA3, PA4, PA6, PA8, PA9,
PA10, PA12) connected to the PA module.
b.Remove the PA board fastening screws (×6) and
remove the PA board.
4.Remove the D board.
a.Remove the coupler (D3) connected to the D board.
b.Remove the flexible cables (D31, D32) connected to the
D board.
c.Remove the D board fastening screws (×4) and remove
the D board.
5.Remove the tuner unit.
a.Remove the coupler (DG12) connected to the tuner unit.
b.Remove the flexible cable (DG7) connected to the tuner
unit.
c.Remove the tuner unit fastening screws (×5), and
remove the tuner unit.
6.Remove the power supply unit.
a.Remove the PF board fastening screws (×4), and
remove the power supply unit.
7.Remove the SU board.
a.Remove the SU board fastening screws (×2).
b.Move the SU board to the left and disconnect from the
couplers (SC41, SC42) on the SC board.
6 Plasma panel replacement method
9
TH-37PD25U-P / TH-42PD25U-P

c.Remove the flexible cables (SU1, SU2, SU3) connected
to the SU board, and remove the SU board.
8.Remove the SD board.
a.Remove the SD board fastening screws (×2).
b.Move the SD board to the left and disconnect from the
couplers (SC43, SC44) on the SC board.
c.Remove the flexible cables (SD1, SD2, SD3) connected
to the SD board, and remove the SD board.
9.Remove the SC board.
a.Remove the SC board fastening screws (×9) and
remove the SC board.
10.Remove the SS2 board.
a.Remove the coupler (SS47) connected to the SS2
board, and remove the flexible cable (SS47).
b.Remove the SS2 boarde fastening screws (×2), and
remove the SS2 board.
10
TH-37PD25U-P / TH-42PD25U-P

11.Remove the SS3 board.
a.Remove the coupler (SS40) and flexible cable (SS46)
connected to the SS3 board.
b.Remove the SS3 board fastening screws (×2), and
remove the SS3 board.
12.Remove the SS board.
a.Remove the couplers (SS23, SS34) connected to the
SS board, and remove the flexible cables (SS40, SS47)
connected to the SS3 board and SS2 board.
b.Remove the flexible cables (SS41, SS42, SS43, SS44)
connected to the SS board.
c.Remove the SS board fastening screws (×6), and
remove the SS boards.
13.Remove the C1 board.
a.Remove the flexible cable holder fastening screws (×6)
connected to the C1 board, and remove flexible cables
(CB1, CB2, CB3).
b.Remove the flexible cable (C12) connected to the C1
board.
c.Remove the C1 board fastening screws (×4), and
remove the C1 board.
14.Remove the C2 board.
a.Remove the flexible cable holder fastening screws (×8)
connected to the C2 board, and remove the flexible
cables (CB4, CB5, CB6, CB7).
11
TH-37PD25U-P / TH-42PD25U-P

b.Remove coupler (CC24) connected to the C2 board.
c.Remove C2 board fastening screws (×4), and remove
the C2 board.
15.Remove the shield plate (bottom).
a.Remove the shield plate (bottom) fastening screws (×7),
and remove the shield plate (bottom).
16.Remove the rear cover mounting brackets.
a.Remove the rear cover mounting bracket (top) fastening
screws (×4), and remove the rear cover mounting
bracket (top).
b.Remove the rear cover mounting bracket (left, right)
fastening screws (×4 each), and remove the rear cover
mounting brackets (left and right).
c.Remove the fastening screws (×2) holding the front
frame and plasma panel.
17.Remove the front frame.
a.Leaving the front glass and front board unit attached to
the front frame, pull the bottom of the front frame
forward, lift, and remove.
18.Remove stand brackets.
a.Remove the plasma panel section from the servicing
stand and lay on a surface such as a table (covered),
with the plasma panel surface facing downward.
Spread a soft cloth or similar on the table for protection,
so the panel surface is not scratched.
b.Remove the stand bracket (left, right) fastening screws
(×4 each) and remove the stand brackets (left, right).
12
TH-37PD25U-P / TH-42PD25U-P

19.Prepare the new panel (finished).
a.Obtain a new plasma panel (finished) to replace the old
plasma panel (finished).
b.Place the new plasma panel (finished) on a surface
such as a table (covered), with the plasma panel
surface facing downward.
20.Install the new plasma panel (finished).
a.Fit the stand brackets (left, right) to the new plasma
panel.
b.Place the plasma panel section on the servicing stand.
* When fitting the front frame, be careful not to allow
any debris, dust or handling residues to remain
between the front glass and plasma panel.
13
TH-37PD25U-P / TH-42PD25U-P

7 Location of Lead Wiring
7.1. Lead of Wiring (1)
14
TH-37PD25U-P / TH-42PD25U-P

7.2. Lead of Wiring (2)
15
TH-37PD25U-P / TH-42PD25U-P

7.3. Lead of Wiring (3)
16
TH-37PD25U-P / TH-42PD25U-P

7.4. Lead of Wiring (4)
17
TH-37PD25U-P / TH-42PD25U-P

8 Self-check Function
When symptoms like “the power fails sometimes” or “sometimes there is no picture and/or sound” can not be confirmed at the
time of servicing, the self-check function can be used to confirm the occurrence and to find the defective circuit.
In case of “power failure”, flashing of the “POWER” indication (red) at the front of the unit can be used to narrow down the +B
line.
8.1. Self-check of the microcomputer control system (bus line)
Indicaton method
Press the “OK” button in the control panel of the unit simultaneously with the “POWER” button in the control panel of the unit.
Hold them a few seconds.
Return to he normal screen
Press any button on the unit or in the remote control.
Screen Display
Display Ref. No. Description Board
MEMORY IC002 EEPROM for Main MPU DG
SOUND IC2401 Sound Control PA
YUV_SW IC4302 YUV switch H
GC2S1 IC4502 Global Core 2 for sub DG
EXDAC2 IC5011 EXDAC DV
PANEL ----- Panel -----
SOUND2 IC4203 BBE VIVA H
TNR1 TNR8000 Tuner 1 DT
MTS IC8008 NXTWARE DT
GC2M1 IC4501 Global Core 2 for main DG
GC2S2 IC9305 New Plasma AI (Slave) D
HDMI IC5003 HDMI Recelver DV
JPEG IC6013 JPEG I/F JG
DTVMPU IC8024 HDsL Peaks DT
TNR2 TNR251 Tuner 2 TB
AVSW IC4301 AV switch H
GC2M2 IC9455 New Plasma AI (Master) D
EXDAC IC3003 External I/O DG
CONV IC3801 Convert Micom DG
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TH-37PD25U-P / TH-42PD25U-P

8.2. Power LED Blinking timing chart
1.Subject
Information of LED Blinking timing chart.
2.Contents
When an abnormality 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 blinkes of the Power LED on the front panel of the unit.
19
TH-37PD25U-P / TH-42PD25U-P

8.3. No Power
First check point
There are following 3 states of No Power indication by power LED.
1.No lit
2.Green is lit then turns red blinking a few seconds later.
3.Only red is lit.
1.No lit
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TH-37PD25U-P / TH-42PD25U-P