Panasonic TH-42PD50U Service Manual ▷ View online
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
6.1.
Remove the Back cover.
9
6.2.
Remove the P-Board.
9
6.3.
Remove the PB-Board
9
6.4.
Remove the D-Board
9
6.5.
Remove the rear terminal cover
10
6.6.
Remove the metal frame
10
6.7.
Remove the DT-Board and DV-Board
10
6.8.
Remove the DG-Board
11
6.9.
Remove the H-Board
11
6.10. Remove the PA-Board
11
6.11. Remove the Z-Board
11
6.12. Remove the SU-Board
12
6.13. Remove the SD-Board
12
6.14. Remove the SC-Board
12
6.15. Remove the SS-Board
13
6.16. Remove the C1-Board
13
6.17. Remove the C2-Board
13
6.18. Remove the K-Board
14
6.19. Remove the S-Board
14
6.20. Remove the Speaker L, R
14
6.21. Remove the Plasma panel section from the Front frame
(glass)
15
6.22. Replace the plasma panel (finished).
15
7 Location of Lead Wiring
16
7.1.
Lead of Wiring (1)
16
7.2.
Lead of Wiring (2)
17
7.3.
Lead of Wiring (3)
18
8 Self-check Function
19
8.1.
How to access
19
8.2.
Power LED Blinking timing chart
20
8.3.
No Power
21
8.4.
No Picture
22
8.5.
Local screen failure
23
9 Serviceman Mode
24
9.1.
How to enter into Serviceman Mode
24
9.2.
Cancellation
24
9.3.
Contents of adjustment mode
24
9.4.
Option
25
10 Adjustment Procedure
26
10.1. Driver Set-up
26
10.2. Initialization Pulse Adjust
27
10.3. P.C.B. (Printed Circuit Board) exchange
28
10.4. Adjustment Volume Location
28
10.5. Test Point Location
28
11 Hotel mode
29
12 Conductor View
31
12.1. P-Board
31
12.2. PA-Board
34
12.3. PB-Board
35
12.4. H-Board
36
12.5. DT-Board
38
12.6. DV-Board
40
12.7. DG-Board
41
12.8. Z-Board
43
12.9. D-Board
44
12.10. C1-Board
47
AUDIO L-R
0.5 Vrms
(Phono Jack Type × 2)
COMPONENT VIDEO
Y
1.0 Vp-p (including synchronization)
INPUT1-2
P
B
/P
R
± 0.35 Vp-p
AUDIO L-R
0.5 Vrms
(Phono Jack Type × 2)
HDMI
HDMI type A Connector
AUDIO L-R
0.5 Vrms
(Phono Jack Type × 2)
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
2
TH-42PD50U
12.11. C2-Board
48
12.12. SC-Board
49
12.13. SU-Board
52
12.14. SD-Board
53
12.15. SS-Board
54
12.16. K and S-Board
56
13 Block and Schematic Diagram
57
13.1. Schematic Diagram Notes
57
13.2. Main Block Diagram
58
13.3. P-Board Block Diagram
59
13.4. P-Board (1 of 6) Schematic Diagram
60
13.5. P-Board (2 of 6) Schematic Diagram
61
13.6. P-Board (3 of 6) Schematic Diagram
62
13.7. P-Board (4 of 6) Schematic Diagram
63
13.8. P-Board (5 of 6) Schematic Diagram
64
13.9. P-Board (6 of 6) Schematic Diagram
65
13.10. PA and PB-Board Block Diagram
66
13.11. PA-Board Schematic Diagram
67
13.12. PB-Board Schematic Diagram
68
13.13. H, K, S and Z-Board Block Diagram
69
13.14. H Board (1 of 3) Schematic Diagram
70
13.15. H-Board (2 of 3) Schematic Diagram
71
13.16. H-Board (3 of 3) Schematic Diagram
72
13.17. Z-Board Schematic Diagram
73
13.18. K and S-Board Schematic Diagram
74
13.19. DT-Board Block Diagram
75
13.20. DT-Board (1 of 4) Schematic Diagram
76
13.21. DT-Board (2 of 4) Schematic Diagram
77
13.22. DT-Board (3 of 4) Schematic Diagram
78
13.23. DT-Board (4 of 4) Schematic Diagram
79
13.24. DV-Board Block Diagram
80
13.25. DV-Board Schematic Diagram
81
13.26. DG-Board (1 of 2) Block Diagram
82
13.27. DG-Board (2 of 2) Block Diagram
83
13.28. DG-Board (1 of 11) Schematic Diagram
84
13.29. DG-Board (2 of 11) Schematic Diagram
85
13.30. DG-Board (3 of 11) Schematic Diagram
86
13.31. DG-Board (4 of 11) Schematic Diagram
87
13.32. DG-Board (5 of 11) Schematic Diagram
88
13.33. DG-Board (6 of 11) Schematic Diagram
89
13.34. DG-Board (7 of 11) Schematic Diagram
90
13.35. DG-Board (8 of 11) Schematic Diagram
91
13.36. DG-Board (9 of 11) Schematic Diagram
92
13.37. DG-Board (10 of 11) Schematic Diagram
93
13.38. DG-Board (11 of 11) Schematic Diagram
94
13.39. D-Board Block Diagram
95
13.40. D-Board (1 of 6) Schematic Diagram
96
13.41. D-Board (2 of 6) Schematic Diagram
97
13.42. D-Board (3 of 6) Schematic Diagram
98
13.43. D-Board (4 of 6) Schematic Diagram
99
13.44. D-Board (5 of 6) Schematic Diagram
100
13.45. D-Board (6 of 6) Schematic Diagram
101
13.46. C1 and C2-Board Block Diagram
102
13.47. C1-Board (1 of 2) Schematic Diagram
103
13.48. C1-Board (2 of 2) Schematic Diagram
104
13.49. C2-Board (1 of 2) Schematic Diagram
105
13.50. C2-Board (2 of 2) Schematic Diagram
106
13.51. SC-Board Block Diagram
107
13.52. SC-Board (1 of 2) Schematic Diagram
108
13.53. SC-Board (2 of 2) Schematic Diagram
109
13.54. SU-Board Block Diagram
110
13.55. SU-Board Schematic Diagram
111
13.56. SD-Board Block Diagram
112
13.57. SD-Board Schematic Diagram
113
13.58. SS-Board Block Diagram
114
13.59. SS-Board Schematic Diagram
115
14 Parts Location & Mechanical Replacement Parts List
117
14.1. Parts Location
117
14.2. Pcaking Exploded Views (1)
118
14.3. Pcaking Exploded Views (2)
119
14.4. Pcaking Exploded Views (3)
120
14.5. Mechanical Replacement Parts List
121
15 Replacement Parts List
122
15.1. Replacement Parts List Notes
122
15.2. Electrical Replacement Parts List
123
3
TH-42PD50U
1 Applicable signals
4
TH-42PD50U
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
1M
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
1M
W and 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 1.5k
W, 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.
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.
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.
5
TH-42PD50U