DOWNLOAD Panasonic TX-LR42U20 Service Manual ↓ Size: 23.45 MB | Pages: 127 in PDF or view online for FREE

Model
TX-LR42U20
Pages
127
Size
23.45 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / KM09 CHASSIS
File
tx-lr42u20.pdf
Date

Panasonic TX-LR42U20 Service Manual ▷ View online

ORDER NO. MTV1001936CE
LCD TV
Model No.
TX-LR42U20
Chassis:
KM09
Destination:
CIS
TABLE OF CONTENTS
PAGE
PAGE
1 Safety Precautions----------------------------------------------- 4
1.1. General Guidelines---------------------------------------- 4
1.1.1. Leakage Current Cold Check---------------------- 4
1.1.2. Leakage Current Hot Check (See Figure
1.) --------------------------------------------------------- 4
2 Warning -------------------------------------------------------------- 5
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostaticy Sensitive (ES) Devices---------- 5
2.2. About lead free solder (PbF)---------------------------- 6
3 Service Navigation ----------------------------------------------- 7
3.1. Service Hint ------------------------------------------------- 7
4 Specifications ----------------------------------------------------- 8
5 Service Mode ------------------------------------------------------ 9
5.1. How to enter into Service Mode ----------------------- 9
5.1.1. Contents of adjustment mode --------------------- 9
5.1.2. How to exit---------------------------------------------- 9
5.2. SRV-TOOL -------------------------------------------------10
5.2.1. How to access ----------------------------------------10
5.2.2. Display of SOS History -----------------------------10
5.2.3. POWER ON TIME/COUNT -----------------------10
5.2.4. Exit ------------------------------------------------------ 10
5.3. Service Mode Adjustment------------------------------ 11
5.3.1. Self Check Mode ------------------------------------ 11
5.3.2. Hotel Mode Adjustment---------------------------- 11
5.3.3. Hotel Mode-------------------------------------------- 11
6 Troubleshooting Guide --------------------------------------- 12
6.1. Check of the IIC bus lines------------------------------ 12
6.1.1. How to access --------------------------------------- 12
6.1.2. Exit ------------------------------------------------------ 12
6.1.3. Screen display --------------------------------------- 12
6.1.4. Check Point------------------------------------------- 12
6.2. Power LED Blinking timing chart --------------------- 13
6.3. No Power--------------------------------------------------- 13
7 Disassembly and Assembly Instructions--------------- 14
7.1. AC Cord Dressing 1 ------------------------------------- 14
7.2. AC Cord Dressing 2 ------------------------------------- 15
7.3. AC Cord Instation ------------------------------------- 16
7.4. Control Panel Assembly & Clamper
Instation ------------------------------------------------- 17
7.5. Side AV Preparation & Instation------------------- 18
TX-LR42U20
2
7.6. G Board & CI Slot Assembly -------------------------- 19
7.7. Speaker Preparation & Installation------------------- 20
7.8. LCD Panel fixing & handling method---------------- 21
7.9. LED Panel Installation ---------------------------------- 22
7.10. Felt Sticking at LVDS Wire ----------------------------- 23
7.11. LCD Bracket and MTG Installation ------------------ 24
7.12. Pedestal Assembly 1 ------------------------------------ 25
7.13. Pedestal Assembly 2 ------------------------------------ 26
7.14. Rear cover ------------------------------------------------- 26
8 Measurements and Adjustments -------------------------- 27
8.1. Voltage chart of A-board-------------------------------- 27
8.2. Voltage chart of P-board-------------------------------- 27
9 Block Diagram --------------------------------------------------- 28
9.1. Main Block Diagram ------------------------------------- 28
10 Wiring Connection Diagram --------------------------------- 29
11 Schematic Diagram--------------------------------------------- 30
11.1. Schematic Diagram Notes ----------------------------- 30
11.2. A Board ----------------------------------------------------- 31
11.2.1. A Board - Sheet : 002 (1 / 7)---------------------- 31
11.2.2. A Board - Sheet : 002 (2 / 7)---------------------- 32
11.2.3. A Board - Sheet : 002 (3 / 7)---------------------- 33
11.2.4. A Board - Sheet : 002 (4 / 7)---------------------- 34
11.2.5. A Board - Sheet : 002 (5 / 7)---------------------- 35
11.2.6. A Board - Sheet : 002 (6 / 7)---------------------- 36
11.2.7. A Board - Sheet : 002 (7 / 7)---------------------- 37
11.2.8. A Board - Sheet : 010 (1 / 4)---------------------- 38
11.2.9. A Board - Sheet : 010 (2 / 4)---------------------- 39
11.2.10. A Board - Sheet : 010 (3 / 4)---------------------- 40
11.2.11. A Board - Sheet : 010 (4 / 4)---------------------- 41
11.2.12. A Board - Sheet : 011 (1 / 4)---------------------- 42
11.2.13. A Board - Sheet : 011 (2 / 4)---------------------- 43
11.2.14. A Board - Sheet : 011 (3 / 4)---------------------- 44
11.2.15. A Board - Sheet : 011 (4 / 4)---------------------- 45
11.2.16. A Board - Sheet : 012 (1 / 5)---------------------- 46
11.2.17. A Board - Sheet : 012 (2 / 5)---------------------- 47
11.2.18. A Board - Sheet : 012 (3 / 5)---------------------- 48
11.2.19. A Board - Sheet : 012 (4 / 5)---------------------- 49
11.2.20. A Board - Sheet : 012 (5 / 5)---------------------- 50
11.2.21. A Board - Sheet : 020 (1 / 6)---------------------- 51
11.2.22. A Board - Sheet : 020 (2 / 6)---------------------- 52
11.2.23. A Board - Sheet : 020 (3 / 6)---------------------- 53
11.2.24. A Board - Sheet : 020 (4 / 6)---------------------- 54
11.2.25. A Board - Sheet : 020 (5 / 6)---------------------- 55
11.2.26. A Board - Sheet : 020 (6 / 6)---------------------- 56
11.2.27. A Board - Sheet : 031 (1 / 5)---------------------- 57
11.2.28. A Board - Sheet : 031 (2 / 5)---------------------- 58
11.2.29. A Board - Sheet : 031 (3 / 5)---------------------- 59
11.2.30. A Board - Sheet : 031 (4 / 5)---------------------- 60
11.2.31. A Board - Sheet : 031 (5 / 5)---------------------- 61
11.2.32. A Board - Sheet : 033 (1 / 3)---------------------- 62
11.2.33. A Board - Sheet : 033 (2 / 3)---------------------- 63
11.2.34. A Board - Sheet : 033 (3 / 3)---------------------- 64
11.2.35. A Board - Sheet : 040 (1 / 7)---------------------- 65
11.2.36. A Board - Sheet : 040 (2 / 7)---------------------- 66
11.2.37. A Board - Sheet : 040 (3 / 7)---------------------- 67
11.2.38. A Board - Sheet : 040 (4 / 7)---------------------- 68
11.2.39. A Board - Sheet : 040 (5 / 7)---------------------- 69
11.2.40. A Board - Sheet : 040 (6 / 7)---------------------- 70
11.2.41. A Board - Sheet : 040 (7 / 7)---------------------- 71
11.2.42. A Board - Sheet : 050 (1 / 4)---------------------- 72
11.2.43. A Board - Sheet : 050 (2 / 4)---------------------- 73
11.2.44. A Board - Sheet : 050 (3 / 4) --------------------- 74
11.2.45. A Board - Sheet : 050 (4 / 4) --------------------- 75
11.2.46. A Board - Sheet : 060 (1 / 5) --------------------- 76
11.2.47. A Board - Sheet : 060 (2 / 5) --------------------- 77
11.2.48. A Board - Sheet : 060 (3 / 5) --------------------- 78
11.2.49. A Board - Sheet : 060 (4 / 5) --------------------- 79
11.2.50. A Board - Sheet : 060 (5 / 5) --------------------- 80
11.2.51. A Board - Sheet : 061 (1 / 2) --------------------- 81
11.2.52. A Board - Sheet : 061 (2 / 2) --------------------- 82
11.2.53. A Board - Sheet : 090 (1 / 5) --------------------- 83
11.2.54. A Board - Sheet : 090 (2 / 5) --------------------- 84
11.2.55. A Board - Sheet : 090 (3 / 5) --------------------- 85
11.2.56. A Board - Sheet : 090 (4 / 5) --------------------- 86
11.2.57. A Board - Sheet : 090 (5 / 5) --------------------- 87
11.2.58. A Board - Sheet : 200 (1 / 3) --------------------- 88
11.2.59. A Board - Sheet : 200 (2 / 3) --------------------- 89
11.2.60. A Board - Sheet : 200 (3 / 3) --------------------- 90
11.2.61. A Board - Sheet : 201 (1 / 3) --------------------- 91
11.2.62. A Board - Sheet : 201 (2 / 3) --------------------- 92
11.2.63. A Board - Sheet : 201 (3 / 3) --------------------- 93
11.2.64. A Board - Sheet : 300 (1 / 6) --------------------- 94
11.2.65. A Board - Sheet : 300 (2 / 6) --------------------- 95
11.2.66. A Board - Sheet : 300 (3 / 6) --------------------- 96
11.2.67. A Board - Sheet : 300 (4 / 6) --------------------- 97
11.2.68. A Board - Sheet : 300 (5 / 6) --------------------- 98
11.2.69. A Board - Sheet : 300 (6 / 6) --------------------- 99
11.2.70. A Board - Sheet : 700 (1 / 3) --------------------100
11.2.71. A Board - Sheet : 700 (2 / 3) --------------------101
11.2.72. A Board - Sheet : 700 (3 / 3) --------------------102
11.2.73. A Board - Sheet : 701 (1 / 2) --------------------103
11.2.74. A Board - Sheet : 701 (2 / 2) --------------------104
11.2.75. A Board - Sheet : 702 (1 / 2) --------------------105
11.2.76. A Board - Sheet : 702 (1 / 2) --------------------106
11.3. G Board ---------------------------------------------------107
11.3.1. G Board (1 / 1)--------------------------------------107
11.4. K Board----------------------------------------------------108
11.4.1. K Board (1 / 2) --------------------------------------108
11.4.2. K Board (2 / 2) --------------------------------------109
11.5. P Board---------------------------------------------------- 110
11.5.1. P Board (1 / 3) -------------------------------------- 110
11.5.2. P Board (2 / 3) -------------------------------------- 111
11.5.3. P Board (3 / 3) -------------------------------------- 112
11.6. V Board---------------------------------------------------- 113
11.6.1. V Board (1 / 3) -------------------------------------- 113
11.6.2. V Board (2 / 3) -------------------------------------- 114
11.6.3. V Board (3 / 3) -------------------------------------- 115
12 Printed Circuit Board----------------------------------------- 116
12.1. A-Board --------------------------------------------------- 116
12.2. A-Board --------------------------------------------------- 117
12.3. G-Board --------------------------------------------------- 118
12.4. G-Board --------------------------------------------------- 118
12.5. K-Board --------------------------------------------------- 119
12.6. K-Board --------------------------------------------------- 119
12.7. V-Board---------------------------------------------------- 119
12.8. V-Board---------------------------------------------------- 119
12.9. P-Board ---------------------------------------------------120
12.10. P-Board ---------------------------------------------------121
13 Exploded View and Replacement Parts List----------122
13.1. Exploded View and Mechanical Replacement
Parts List --------------------------------------------------122
13.2. Electrical Replacement Parts List ------------------122
TX-LR42U20
3
13.2.1. Replacement Parts List Notes------------------ 122
13.2.2. Electrical Replacement Parts List ------------- 123
TX-LR42U20
4
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.
4. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
5. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the
wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the entire wiring unit instead.
6. When conducting repairs and servicing, do not twist the Faston connectors but plug them straight in or unplug them straight
out.
1.1.1.
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 100 Mohm and over.
When the exposed metal does not have a return path to 
the chassis, the reading must be 
.
1.1.2.
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 1.5kohm, 10 watts resistor, in parallel with a
0.15
μF 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.
Figure 1
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  • DOWNLOAD Panasonic TX-LR42U20 Service Manual ↓ Size: 23.45 MB | Pages: 127 in PDF or view online for FREE
  • Here you can View online or download the Service Manual for the Panasonic TX-LR42U20 in PDF for free, which will help you to disassemble, recover, fix and repair Panasonic TX-LR42U20 TV. Information contained in Panasonic TX-LR42U20 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.