Panasonic TH37PX50U - 37" HD PLASMA TV User manual

©2005 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
TH-37PX50U
TH-42PX50U
TH-50PX50U
GP8DU Chassis
Digital High Definition Plasma Television
Specifications
Power Source AC 120 V, 50/60 Hz
Power Consumption
Maximum 325 W (TX-37PX50U), 399 W (TH-42PX50U), 525 W (TH-50PX50U)
Stand-by condition 0.6 W (with CableCARD ™ : 18.0 W) (TX-37PX50U)
0.6 W (with CableCARD ™ : 22.0 W) (TH-42PX50U)
0.6 W (with CableCARD ™ : 22.0 W) (TH-50PX50U)
Plasma Display panel Drive method : AC type 37-inch , 16 : 9 aspect ratio (TX-37PX50U)
Drive method : AC type 42-inch , 16 : 9 aspect ratio (TH-42PX50U)
Drive method : AC type 50-inch , 16 : 9 aspect ratio (TH-50PX50U)
Screen Size 32 13/64 ’’ (818 mm) × 18 5/32 ’’ (461 mm) × 36 31/32 ’’ (939 mm) (TX-37PX50U)
(W×H×diagonal) 36 7/32 ’’ (920 mm) × 20 25/64 ’’ (518 mm) × 41 9/16 ’’ (1056 mm) (TX-42PX50U)
43 35/64 ’’ (1106 mm) × 24 31/64 ’’ (622 mm) × 49 61/64 ’’(1269 mm) (TX-50PX50U)
Dimensions 38 7/64 ’’ (968 mm) × 25 15/64 ’’ (641 mm) × 3 51/64 ’’ (96.5 mm) (TX-37PX50U)
(W×H×D) 42 3/64 ’’ (1068 mm) × 27 39/64 ’’ (701 mm) × 3 51/64 ’’ (96.5 mm) (TX-42PX50U)
49 31/64 ’’ (1257 mm) × 32 3/64 ’’ (814 mm) × 3 51/64 ’’ (96.5 mm) (TH-50PX50U)
Mass (Weight) 66.14lb. (30kg) (TX-37PX50U), 76.06lb. (34.5kg) (TX-42PX50U), 99.21lb. (45kg) (TX-50PX50U)
Channel Capability-ATSC/NTSC VHF/ UHF : 2-69, CATV:1-135
Sound
Speaker 423/32 ’’ (120 mm) × 2 23/64 ’’ (60 mm) × 2 pcs, 6W
Audio Output 16 W [ 8 W + 8 W ] ( 10 % THD )
FEATURES 3D Y/C FILTER HDMI Cable CARD TM Slot
CLOSED CAPTION
V
-Chip
Accessories Supplied Remote control: EUR7627Z60
F-type antenna adapter (5C-2V × 1)
AA Battery × 2
Pedestal
AC Cord
Cable clamper × 2
Operating Conditions Temperature : 32 °F - 104 °F (0 ° - 40 °C)
ORDER NO. ITD0503013CE
B19 Canada: B07

1 Applicable signals 6
2 Safety Precautions 6
2.1. General Guidelines 6
3 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 7
4 About lead free solder (PbF) 8
5 Service Hint 9
5.1. TH-37, 42PX50U 9
5.2. TH-50PX50U 10
6 Plasma panel replacement method 11
6.1. Remove the Back cover. 11
6.2. Remove the P-Board. 11
6.3. Remove the PB-Board 11
6.4. Remove the D-Board 11
6.5. Remove the rear terminal cover 12
6.6. Remove the metal frame 12
6.7. Remove the DT-Board and DV-Board 12
6.8. Remove the DG-Board 13
6.9. Remove the H-Board 13
6.10. Remove the PA-Board 13
6.11. Remove the Z-Board 13
6.12. Remove the SU-Board(37inch) 14
6.13. Remove the SU-Board(42inch) 14
6.14. Remove the SU-Board(50inch) 15
6.15. Remove the SD-Board(37inch) 15
6.16. Remove the SD-Board(42inch) 16
6.17. Remove the SD-Board(50inch) 16
6.18. Remove the SC-Board(37, 42inch) 17
6.19. Remove the SC-Board(50inch) 17
6.20. Remove the SS2-Board(42, 50inch) 17
6.21. Remove the SS3-Board(42, 50inch) 17
6.22. Remove the SS-Board(37, 42inch) 18
6.23. Remove the SS-Board(50inch) 18
6.24. Remove the Fan 18
6.25. Remove the C1-Board(37, 42inch) 19
6.26. Remove the C2-Board(37, 42inch) 19
6.27. Remove the C1-Board(50inch) 19
6.28. Remove the C2-Board(50inch) 19
6.29. Remove the C3-Board(50inch) 20
6.30. Remove the Speaker L, R 20
6.31. Remove the stand brackets. 20
6.32. Remove the C3-Board(37, 42inch) 20
6.33. Remove the C4-Board(37, 42inch) 21
6.34. Remove the C4-Board(50inch) 21
6.35. Remove the C5-Board(50inch) 21
6.36. Remove the C6-Board(50inch) 21
Humidity : 20 % - 80 % (non-condensing)
Connection Terminals AV INPUT 1- 2
V
IDEO 1.0 Vp-p (75 W)
(Phono Jack Type)
S-VIDEO Y : 1.0 Vp-p (75 W), C : 0.286 Vp-p (75 W)
(Mini DIN 4-pin)
A
UDIO L-R 0.5 Vrms
(Phono Jack Type × 2)
AV PROG. OUT
V
IDEO 1.0 Vp-p (75 W)
(Phono Jack Type)
A
UDIO L-R 0.5 Vrms
(Phono Jack Type × 2)
COMPONENT VIDEO Y1.0 Vp-p (including synchronization)
INPUT1-2 PB / PR ±0.35Vp-p
A
UDIO L-R 0.5 Vrms
(Phono Jack Type × 2)
HDMI HDMI type A Connector
A
UDIO L-R 0.5 Vrms
(Phono Jack Type × 2)
DIGITAL AUDIO OUT PCM / Dolby Digital, Fiber Optic
Note:
Design and Specifications are subject change without notice.
Weight and Dimensions shown are approximate.
CONTENTS
Page Page
2
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.37. Remove the K-Board 22
6.38. Remove the S-Board 22
6.39. Remove the Plasma panel section from the Front frame
(glass) 22
6.40. Replace the plasma panel (finished). 23
7 Location of Lead Wiring 24
7.1. Lead of Wiring (1) 24
7.2. Lead of Wiring (2) 25
7.3. Lead of Wiring (3) 26
7.4. Lead of Wiring (4) 27
7.5. Lead of Wiring (5) 28
7.6. Lead of Wiring (6) 29
7.7. Lead of Wiring (7) 30
7.8. Lead of Wiring (8) 31
7.9. Lead of Wiring (9) 32
7.10. Lead of Wiring (10) 33
8 Self-check Function 34
8.1. How to access 34
8.2. Power LED Blinking timing chart 35
8.3. No Power 36
8.4. No Picture 37
8.5. Local screen failure 38
9 Serviceman Mode 39
9.1. How to enter into Serviceman Mode 39
9.2. Cancellation 39
9.3. Contents of adjustment mode 39
9.4. Option 40
10 Adjustment Procedure 41
10.1. Driver Set-up 41
10.2. Initialization Pulse Adjust 42
10.3. P.C.B. (Printed Circuit Board) exchange 43
10.4. Adjustment Volume Location 44
10.5. Test Point Location 45
11 Hotel mode 46
12 Conductor View 47
12.1. P-Board (37inch) 47
12.2. P-Board (42inch) 50
12.3. P-Board (50inch) 53
12.4. PA-Board 56
12.5. PB-Board 57
12.6. H-Board 58
12.7. DT-Board 60
12.8. DV-Board 62
12.9. DG-Board 63
12.10. Z-Board 65
12.11. D-Board (37, 42inch) 66
12.12. D-Board (50inch) 69
12.13. C1-Board (37inch) 72
12.14. C2-Board (37inch) 73
12.15. C3-Board (37inch) 74
12.16. C4-Board (37inch) 75
12.17. C1-Board (42inch) 76
12.18. C2-Board (42inch) 77
12.19. C3-Board (42inch) 78
12.20. C4-Board (42inch) 79
12.21. C1-Board (50inch) 80
12.22. C2-Board (50inch) 81
12.23. C3-Board (50inch) 82
12.24. C4-Board (50inch) 83
12.25. C5-Board (50inch) 84
12.26. C6-Board (50inch) 85
12.27. SC-Board (37inch) 86
12.28. SC-Board (42inch) 89
12.29. SC-Board (50inch) 92
12.30. SU-Board (37inch) 95
12.31. SU-Board (42inch) 96
12.32. SU-Board (50inch) 97
12.33. SD-Board (37inch) 98
12.34. SD-Board (42inch) 99
12.35. SD-Board (50inch) 100
12.36. SS-Board (37inch) 101
12.37. SS, SS2 and SS3-Board (42inch) 103
12.38. SS, SS2 and SS3-Board (50inch) 105
12.39. K and S-Board 107
13 Block and Schematic Diagram 109
13.1. Schematic Diagram Notes 109
13.2. Main Block Diagram (37inch) 110
13.3. Main Block Diagram (42inch) 111
13.4. Main Block Diagram (50inch) 112
13.5. P-Board Block Diagram (37inch) 113
13.6. P-Board (1 of 6) Schematic Diagram (37inch) 114
13.7. P-Board (2 of 6) Schematic Diagram (37inch) 115
13.8. P-Board (3 of 6) Schematic Diagram (37inch) 116
13.9. P-Board (4 of 6) Schematic Diagram (37inch) 117
13.10. P-Board (5 of 6) Schematic Diagram (37inch) 118
13.11. P-Board (6 of 6) Schematic Diagram (37inch) 119
13.12. P-Board Block Diagram (42inch) 120
13.13. P-Board (1 of 2) Schematic Diagram (42inch) 121
13.14. P-Board (2 of 2) Schematic Diagram (42inch) 122
13.15. P-Board Block Diagram (50inch) 123
13.16. P-Board (1 of 2) Schematic Diagram (50inch) 124
13.17. P-Board (2 of 2) Schematic Diagram (50inch) 125
13.18. PA and PB Board Block Diagram 126
13.19. PA-Board Schematic Diagram 127
13.20. PB-Board Schematic Diagram 128
13.21. H, K, S and Z-Board Block Diagram 129
13.22. H-Board (1 of 3) Schematic Diagram 130
13.23. H-Board (2 of 3) Schematic Diagram 131
13.24. H-Board (3 of 3) Schematic Diagram 132
13.25. Z-Board Schematic Diagram 133
13.26. K and S-Board Schematic Diagram 134
13.27. DV-Board Block Diagram 135
13.28. DV-Board Schematic Diagram 136
13.29. DT-Board Block Diagram 137
13.30. DT-Board (1 of 5) Schematic Diagram 138
13.31. DT-Board (2 of 5) Schematic Diagram 139
13.32. DT-Board (3 of 5) Schematic Diagram 140
13.33. DT-Board (4 of 5) Schematic Diagram 141
3
TH-37PX50U / TH-42PX50U / TH-50PX50U

13.34. DT-Board (5 of 5) Schematic Diagram 142
13.35. DG-Board (1 of 2) Block Diagram 143
13.36. DG-Board (2 of 2) Block Diagram 144
13.37. DG-Board (1 of 11) Schematic Diagram 145
13.38. DG-Board (2 of 11) Schematic Diagram 146
13.39. DG-Board (3 of 11) Schematic Diagram 147
13.40. DG-Board (4 of 11) Schematic Diagram 148
13.41. DG-Board (5 of 11) Schematic Diagram 149
13.42. DG-Board (6 of 11) Schematic Diagram 150
13.43. DG-Board (7 of 11) Schematic Diagram 151
13.44. DG-Board (8 of 11) Schematic Diagram 152
13.45. DG-Board (9 of 11) Schematic Diagram 153
13.46. DG-Board (10 of 11) Schematic Diagram 154
13.47. DG-Board (11 of 11) Schematic Diagram 155
13.48. D-Board Block Diagram (37, 42inch) 156
13.49. D-Board Block Diagram (50inch) 157
13.50. D-Board (1 of 6) Schematic Diagram 158
13.51. D-Board (2 of 6) Schematic Diagram 159
13.52. D-Board (3 of 6) Schematic Diagram 160
13.53. D-Board (4 of 6) Schematic Diagram 161
13.54. D-Board (5 of 6) Schematic Diagram 162
13.55. D-Board (6 of 6) Schematic Diagram 163
13.56. C1, C2, C3 and C4-Board Block Diagram (37, 42inch) 164
13.57. C1-Board (1 of 2) Schematic Diagram (37inch) 165
13.58. C1-Board (2 of 2) Schematic Diagram (37inch) 166
13.59. C2-Board (1 of 2) Schematic Diagram (37inch) 167
13.60. C2-Board (2 of 2) Schematic Diagram (37inch) 168
13.61. C3-Board (1 of 2) Schematic Diagram (37inch) 169
13.62. C3-Board (2 of 2) Schematic Diagram (37inch) 170
13.63. C4-Board (1 of 2) Schematic Diagram (37inch) 171
13.64. C4-Board (2 of 2) Schematic Diagram (37inch) 172
13.65. C1-Board (1 of 2) Schematic DIagram (42inch) 173
13.66. C1-Board (2 of 2) Schematic DIagram (42inch) 174
13.67. C2-Board (1 of 2) Schematic Diagram (42inch) 175
13.68. C2-Board (2 of 2) Schematic Diagram (42inch) 176
13.69. C3-Board (1 of 2) Schematic Diagram (42inch) 177
13.70. C3-Board (2 of 2) Schematic Diagram (42inch) 178
13.71. C4-Board (1 of 2) Schematic Diagram (42inch) 179
13.72. C4-Board (2 of 2) Schematic Diagram (42inch) 180
13.73. C1, C2,C5 and C6-Board Block Diagram (50inch) 181
13.74. C3 and C4-Board Block Diagram (50inch) 182
13.75. C1-Board (1 of 2) Schematic Diagram (50inch) 183
13.76. C1-Board (2 of 2) Schematic Diagram (50inch) 184
13.77. C2-Board (1 of 2) Schematic Diagram (50inch) 185
13.78. C2-Board (2 of 2) Schematic Diagram (50inch) 186
13.79. C3-Board (1 of 2) Schematic Diagram (50inch) 187
13.80. C3-Board (2 of 2) Schematic Diagram (50inch) 188
13.81. C4-Board (1 of 2) Schematic Diagram (50inch) 189
13.82. C4-Board (2 of 2) Schematic Diagram (50inch) 190
13.83. C5-Board (1 of 2) Schematic Diagram (50inch) 191
13.84. C5-Board (2 of 2) Schematic Diagram (50inch) 192
13.85. C6-Board (1 of 2) Schematic Diagram (50inch) 193
13.86. C6-Board (2 of 2) Schematic Diagram (50inch) 194
13.87. SC-Board Block Diagram (37inch) 195
13.88. SC-Board (1 of 2) Schematic Diagram (37inch) 196
13.89. SC-Board (2 of 2) Schematic Diagram (37inch) 197
13.90. SC-Board Block Diagram (42inch) 198
13.91. SC-Board (1 of 2) Schematic Diagram (42inch) 199
13.92. SC-Board (2 of 2) Schematic Diagram (42inch) 200
13.93. SC-Board Block Diagram (50inch) 201
13.94. SC-Board (1 of 2) Schematic Diagram (50inch) 202
13.95. SC-Board (2 of 2) Schematic Diagram (50inch) 203
13.96. SU-Board Block Diagram (37inch) 204
13.97. SU-Board (1 of 2) Schematic Diagram (37inch) 205
13.98. SU-Board (2 of 2) Schematic Diagram (37inch) 206
13.99. SU-Board Block Diagram (42, 50inch) 207
13.100. SU-Board (1 of 2) Schematic Diagram (42inch)
208
13.101. SU-Board (2 of 2) Schematic Diagram (42inch)
209
13.102. SU-Board (1 of 2) Schematic Diagram (50inch)
210
13.103. SU-Board (2 of 2) Schematic Diagram (50inch)
211
13.104. SD-Board Block Diagram (37inch)
212
13.105. SD-Board (1 of 2) Schematic Diagram (37inch)
213
13.106. SD-Board (2 of 2) Schematic Diagram (37inch)
214
13.107. SD-Board Block Diagram (42, 50inch)
215
13.108. SD-Board (1 of 2) Schematic Diagram (42inch)
216
13.109. SD-Board (2 of 2) Schematic Diagram (42inch)
217
13.110. SD-Board (1 of 2) Schematic Diagram (50inch)
218
13.111. SD-Board (2 of 2) Schematic Diagram (50inch)
219
13.112. SS-Board Block Diagram (37inch)
220
13.113. SS-Board Schematic Diagram (37inch)
221
13.114. SS, SS2 and SS3-Board Block Diagram (42inch)
222
13.115. SS, SS2 and SS3-Board Schematic Diagram (42inch)
223
13.116. SS, SS2 and SS3-Board Block Diagram (50inch)
224
13.117.
SS-Board (1 of 2), SS2 and SS3 Schematic Diagram
(50inch) 225
13.118. SS-Board (2 of 2) Schematic Diagram (50inch)
226
14 Parts Location & Mechanical Replacement Parts List 227
14.1. Parts Location 227
14.2. Pcaking Exploded Views (1) 228
14.3. Pcaking Exploded Views (2) 229
4
TH-37PX50U / TH-42PX50U / TH-50PX50U

14.4. Pcaking Exploded Views (3) 230
14.5. Mechanical Replacement Parts List 231
15 Electrical Replacement Parts List 233
15.1. Replacement Parts List Notes 233
15.2. Electrical Replacement Parts List (TH-37PX50U) 234
15.3. Electrical Replacement Parts List (TH-42PX50U) 262
15.4. Electrical Replacement Parts List (TH-50PX50U) 289
5
TH-37PX50U / TH-42PX50U / TH-50PX50U

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
1MWand 5.2MW.
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 1.5kW, 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.
1 Applicable signals
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.
6
TH-37PX50U / TH-42PX50U / TH-50PX50U

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).
7
TH-37PX50U / TH-42PX50U / TH-50PX50U

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.
8
TH-37PX50U / TH-42PX50U / TH-50PX50U

5 Service Hint
5.1. TH-37, 42PX50U
Board Name Function Board Name Function
PPower Supply C1 Data Driver (Up Left)
PA DC-DC Converter, Power SOS C2 Data Driver (Up Right)
PB Audio Power, Fan Control C3 Data Driver (Down Right)
HAV Terminal, AV Switch C4 Data Driver (Down Left)
DT ATSC Interface SC Scan Drive
DV HDMI Interface
None serviceable.
DV-Board should be exchanged for service.
SU Scan out (Up)
SD Scan out (Down)
SS Sustain Drive
DG Digital Signal Processor SS2 Sustain Connector (Up) (42inch only)
ZSpeaker out, Audio AMP SS3 Sustain Connector (Down) (42inch only)
DFormat Converter, Plasma AI Processor KRemote receiver, Keyscan
SPower Switch
9
TH-37PX50U / TH-42PX50U / TH-50PX50U

5.2. TH-50PX50U
Board Name Function Board Name Function
PPower Supply C1 Data Driver (Up Left)
PA DC-DC Converter, Power SOS C2 Data Driver (Up Center)
PB Audio Power, Fan Control C3 Data Driver (Up Right)
HAV Terminal, AV Switch C4 Data Driver (Down Right)
DT ATSC Interface C5 Data Driver (Down Center)
DV HDMI Interface
None serviceable.
DV-Board should be exchanged for service.
C6 Data Driver (Down Left)
SC Scan Drive
SU Scan out (Up)
DG Digital Signal Processor SD Scan out (Down)
ZSpeaker out, Audio AMP SS Sustain Drive
DFormat Converter, Plasma AI Processor SS2 Sustain Connector (Up)
SS3 Sustain Connector (Down)
KRemote receiver, Keyscan
SPower Switch
10
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.1. Remove the Back cover.
1.See Service hint (Section 5).
6.2. Remove the P-Board.
Caution:
To remove P.C.B., wait 1 minute after power was off for
discharge from electrolisis capacitors.
1.Disconnect the couplers (P2, P5, P9, P10, P11, P12, P23,
P25 and P30).
2.Remove the screws (×5 ) and remove the P-Board.
6.3. Remove the PB-Board
1.Unlock the cable clampers to free the cable.
2.Disconnect the couplers (PB5, PB7, PB30, PB33 and
PB34).
3.Remove the screws (×3 ) and remove the PB-Board
metal frame.
4.Remove the screws (× 4 ) and remove the PB-Board.
6.4. Remove the D-Board
1.Remove the PB-Board.
2.Disconnect the couplers (D3, D5, D20 and D25) and
3.Disconnect the flexible cables (D33 and D34).
4.Remove the screws (×4 ) and remove the D-Board.
6 Plasma panel replacement method
11
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.5. Remove the rear terminal
cover
1.Remove the screws (×4 ).
2.Remove the rear terminal cover.
6.6. Remove the metal frame
1.Unlock the cable clampers to free the cable.
2.Disconnect the couplers (D3, D5, H7, P10 and PB7) and
relay connector (SP-L and SP-R).
3.Remove the screws (×4 ) remove the metal frame.
6.7. Remove the DT-Board and DV-
Board
1.Unlock the cable clampers to free the cable.
2.Remove the screws (×5 ).
3.Remove the DT-Board and DV-Board unit.
(Be careful the couplers (DV15 and DT22) when remove
the DT-Board and DV-Board unit.)
4.Remove the screws (×1 ) and remove the DV-Board.
5.Remove the screws (×2 ) and Remove the screws (×5
).
6.Remove the DT-Board metal cover and remove the DT-
Board.
12
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.8. Remove the DG-Board
1.Unlock the cable clampers to free the cable.
2.Disconnect the couplers (DG3 and DG5).
3.Disconnect the flexible cables (DG1, DG2 and DG20).
4.Remove the screws (×2 ) and remove the DG-Board.
6.9. Remove the H-Board
1.Unlock the cable clampers to free the cable.
2.Disconnect the coupler (H7).
3.Disconnect the flexible cables (H1, H2, H30 and H50).
4.Remove the screws (×4 ) and remove the H-Board.
6.10. Remove the PA-Board
1.Unlock the cable clampers to free the cable.
2.Disconnect the couplers (PA7 and PA10).
3.Disconnect the flexible cables (PA20 and PA30).
4.Remove the screws (×4 ) and remove the PA-Board.
6.11. Remove the Z-Board
1.Unlock the cable clampers to free the cable.
2.Disconnect the coupler (Z2).
3.Disconnect the flexible cable (Z50).
4.Remove the screws (×2 ) and remove the Z-Board.
13
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.12. Remove the SU-Board
(37inch)
1.Remove the screws (×2 )
2.Slide the SU-Board to the left to disconnect from a coupler
(SC41 - SU41) on the SC-Board and disconnect a bridge
connector (SU45 or SC45).
3.Disconnect the flexible cables (SU1, SU2, SU3) connected
to the SU-Board, and remove the SU-Board.
6.13. Remove the SU-Board
(42inch)
1.Remove the screws (×2 ).
2.Slide the SU-Board to the left to disconnect from a coupler
(SC41 - SU41) on the SC-Board and remove a coupler
(SU45 or SC45).
3.Remove the flexible cables (SU1, SU2, SU3, SU4)
connected to the SU-Board, and remove the SU-Board.
14
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.14. Remove the SU-Board
(50inch)
1.Remove the screws (×3 ).
2.Slide the SU-Board to the left to disconnect from a coupler
(SC41 - SU41) on the SC-Board and remove a coupler
(SU45 or SC45).
3.Remove the flexible cables (SU1, SU2, SU3, SU4)
connected to the SU-Board, and remove the SU-Board.
6.15. Remove the SD-Board
(37inch)
1.Remove the screws (×2 )
2.Slide the SD-Board to the left to disconnect from a coupler
(SC42 - SD42) on the SC-Board and disconnect a bridge
connector (SD46 or SC46).
3.Disconnect the flexible cables (SD1, SD2, SD3) connected
to the SU-Board, and remove the SD-Board.
15
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.16. Remove the SD-Board
(42inch)
1.Remove the screws (×2 ).
2.Slide the SD-Board to the left to disconnect from a coupler
(SC42 - SD42) on the SC-Board and remove a coupler
(SD46 or SC46).
3.Remove the flexible cables (SD1, SD2, SD3, SD4)
connected to the SD-Board, and remove the SD-Board.
6.17. Remove the SD-Board
(50inch)
1.Remove the screws (×3 ).
2.Slide the SD-Board to the left to disconnect from a coupler
(SC42 - SD42) on the SC-Board and remove a coupler
(SD46 or SC46).
3.Remove the flexible cables (SD1, SD2, SD3, SD4)
connected to the SD-Board, and remove the SD-Board.
16
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.18. Remove the SC-Board
(37, 42inch)
1.Disconnect the couplers (SC2, SC20, SC23).
2.Remove the screws (×6 ) and remove the SC-Board.
6.19. Remove the SC-Board
(50inch)
1.Disconnect the couplers (SC2, SC20, SC23)
2.Remove the screws (×9 ) and remove the SC-Board.
6.20. Remove the SS2-Board
(42, 50inch)
1.Disconnect the coupler (SS23) and disconnect the flexible
cable (SS55).
2.Remove the screws (×2 ) and remove the SS2-Board.
6.21. Remove the SS3-Board
(42, 50inch)
1.Disconnect the coupler (SS22) and disconnect the flexible
cable (SS56).
2.Remove the screws (×2 ) and remove the SS3-Board.
17
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.22. Remove the SS-Board
(37, 42inch)
1.Remove the SS2-Board and SS3-Board (42inch).
2.Disconnect the couplers (SS11, SS12, SS24, SS32 and
SS34).
3.Disconnect the flexible cables (SS51, SS52, SS53 and
SS54).
4.Remove the screws (×6 ), and remove the SS-Board.
6.23. Remove the SS-Board
(50inch)
1.Remove the SS2-Board and SS3-Board.
2.Disconnect the couplers (SS11, SS12, SS34, SS35, SS42
and SS44).
3.Disconnect the flexible cables (SS51, SS52, SS53 and
SS54).
4.Remove the screws (×7 ) and remove the SS-Board.
6.24. Remove the Fan
1.Remove the screws (×3 each) remove the fan and
disconnect the relay coupler.
18
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.25. Remove the C1-Board
(37, 42inch)
1.Remove the fan .
2.Disconnect the flexible cable holder fastening screws (×8
) and disconnect the flexible cables (CA1 ~ CA4).
3.Disconnect the flexible cables (C11) and disconnect the
coupler (C12) .
4.Remove the screws (×3 ) and remove the C1-Board.
6.26. Remove the C2-Board
(37, 42inch)
1.Remove the fan.
2.Disconnect the flexible cable holder fastening screws (×8
) and remove the flexible cables (CA5 ~ CA8).
3.Disconnect the flexible cable (C21).
4.Remove the screws (×3 ), the couplers (C22, C32) and
remove the C2-Board.
6.27. Remove the C1-Board
(50inch)
1.Remove the fan.
2.Remove the flexible cables holder fastening screws (×6
) and disconnect the flexible cables (CA1~CA3).
3.Disconnect the flexible cable (C10) and disconnect the
coupler (C11).
4.Remove the screw (×5 ) and remove the C1-Board.
6.28. Remove the C2-Board
(50inch)
1.Remove the fan.
2.Remove the flexible cables holder fastening screws (×8
) and disconnect the flexible cables (CA4~CA7).
3.Disconnect the Flexible cables (C20, C21, C24, C25) and
disconnect the couplers (C22, C23).
4.Remove the screws (×5 ) and remove the C2-Board.
19
TH-37PX50U / TH-42PX50U / TH-50PX50U

6.29. Remove the C3-Board
(50inch)
1.Remove the fan.
2.Remove the flexible cables holder fastening screws (×8
) and disconnect the flexible cables (CA8~CA11).
3.Disconnect the flexible cable (C31) and disconnect the
couplers (C33, C35).
4.Remove the screws (×5 ) and remove the C3-Board.
6.30. Remove the Speaker L, R
1.Remove the screw (×8 ) and disconnect the relay
connector L, R.
2.Remove the Speaker L, R.
6.31. Remove the stand brackets.
1.Remove the plasma panel section from the servicing stand
and lay on a flat 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.
2.Remove the stand bracket (left, right) fastening screws (×4
each) and remove the stand brackets (left, right).
6.32. Remove the C3-Board
(37, 42inch)
1.Remove the flexible cable holder fastening screws (×8), and
disconnect the flexible cables (CB5, CB6, CB7, CB8).
2.Disconnect the couplers (C33, C42, C44), and disconnect
the flexible cables (C31).
3.Remove the screws (×3 ), and remove the C3-Board.
20
TH-37PX50U / TH-42PX50U / TH-50PX50U