Panasonic TX-LR37D25 Service Manual ▷ View online
ORDER NO. MTV1001977CE
LCD TV
Model No.
TX-LR37D25
Chassis:
LA02
Destination:
CIS
TABLE OF CONTENTS
PAGE
PAGE
1 Safety Precautions----------------------------------------------- 3
1.1. General Guidelines---------------------------------------- 3
1.1.1. Leakage Current Cold Check---------------------- 3
1.1.2. Leakage Current Hot Check (See Figure
1.1.2. Leakage Current Hot Check (See Figure
1.) --------------------------------------------------------- 3
2 Warning -------------------------------------------------------------- 4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostaticy Sensitive (ES) Devices---------- 4
2.2. About lead free solder (PbF)---------------------------- 5
3 Service Navigation ----------------------------------------------- 6
3.1. Service Hint ------------------------------------------------- 6
3.2. Applicable signals ----------------------------------------- 7
3.2. Applicable signals ----------------------------------------- 7
4 Specifications ----------------------------------------------------- 8
5 Service Mode ------------------------------------------------------ 9
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
5.1.2. 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
5.2.3. 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
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
6.1.2. 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
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
7.2. AC Cord Dressing 2 ------------------------------------- 15
7.3. AC Cord Instation ------------------------------------- 16
TX-LR37D25
2
7.4. AC Cord Bracket Installation -------------------------- 17
7.5. Control Panel Assembly Installation----------------- 18
7.6. LCD Panel fixing & handling method---------------- 19
7.7. LCD Panel Installation ---------------------------------- 20
7.8. V PCB and LED Panel Installation------------------- 21
7.9. Side AV Bracket Installation --------------------------- 22
7.5. Control Panel Assembly Installation----------------- 18
7.6. LCD Panel fixing & handling method---------------- 19
7.7. LCD Panel Installation ---------------------------------- 20
7.8. V PCB and LED Panel Installation------------------- 21
7.9. Side AV Bracket Installation --------------------------- 22
7.10. Metal Side AV Bracket Installation ------------------- 23
7.11. SP Unit Installation--------------------------------------- 24
7.12. Metal Support Installation ------------------------------ 25
7.13. Barrier Installation---------------------------------------- 26
7.14. Metal Bracket Bottom Installation -------------------- 27
7.15. A PCB Installation---------------------------------------- 28
7.16. P PCB Installation---------------------------------------- 29
7.17. T-Con PCB Installation---------------------------------- 30
7.13. Barrier Installation---------------------------------------- 26
7.14. Metal Bracket Bottom Installation -------------------- 27
7.15. A PCB Installation---------------------------------------- 28
7.16. P PCB Installation---------------------------------------- 29
7.17. T-Con PCB Installation---------------------------------- 30
8 Measurements and Adjustments -------------------------- 31
8.1. Power Supply to Check A-Board--------------------- 31
8.2. Target of WB adjustment value ----------------------- 31
8.3. Picture level adjustment (RF) ------------------------- 32
8.4. Picture level adjustment (VIDEO)-------------------- 32
8.5. Picture level adjustment (YUV) ----------------------- 32
8.2. Target of WB adjustment value ----------------------- 31
8.3. Picture level adjustment (RF) ------------------------- 32
8.4. Picture level adjustment (VIDEO)-------------------- 32
8.5. Picture level adjustment (YUV) ----------------------- 32
9 Block Diagram --------------------------------------------------- 33
9.1. Main Block Diagram ------------------------------------- 33
9.2. Detailed Block Diagram (1/3)-------------------------- 34
9.3. Detailed Block Diagram (2/3)-------------------------- 35
9.4. Detailed Block Diagram (3/3)-------------------------- 36
9.2. Detailed Block Diagram (1/3)-------------------------- 34
9.3. Detailed Block Diagram (2/3)-------------------------- 35
9.4. Detailed Block Diagram (3/3)-------------------------- 36
10 Wiring Connection Diagram --------------------------------- 37
10.1. Wire Dressing 1------------------------------------------- 37
10.2. Wire Dressing 2------------------------------------------- 38
10.2. Wire Dressing 2------------------------------------------- 38
11 Schematic Diagram--------------------------------------------- 39
11.1. Schematic Diagram Notes ----------------------------- 39
11.2. A-Board (1/17) Schematic Diagram ----------------- 40
11.3. A-Board (2/17) Schematic Diagram ----------------- 41
11.4. A-Board (3/17) Schematic Diagram ----------------- 42
11.5. A-Board (4/17) Schematic Diagram ----------------- 43
11.6. A-Board (5/17) Schematic Diagram ----------------- 44
11.7. A-Board (6/17) Schematic Diagram ----------------- 45
11.8. A-Board (7/17) Schematic Diagram ----------------- 46
11.9. A-Board (8/17) Schematic Diagram ----------------- 47
11.2. A-Board (1/17) Schematic Diagram ----------------- 40
11.3. A-Board (2/17) Schematic Diagram ----------------- 41
11.4. A-Board (3/17) Schematic Diagram ----------------- 42
11.5. A-Board (4/17) Schematic Diagram ----------------- 43
11.6. A-Board (5/17) Schematic Diagram ----------------- 44
11.7. A-Board (6/17) Schematic Diagram ----------------- 45
11.8. A-Board (7/17) Schematic Diagram ----------------- 46
11.9. A-Board (8/17) Schematic Diagram ----------------- 47
11.10. A-Board (9/17) Schematic Diagram ----------------- 48
11.11. A-Board (10/17) Schematic Diagram --------------- 49
11.12. A-Board (11/17) Schematic Diagram---------------- 50
11.13. A-Board (12/17) Schematic Diagram --------------- 51
11.14. A-Board (13/17) Schematic Diagram --------------- 52
11.15. A-Board (14/17) Schematic Diagram --------------- 53
11.16. A-Board (15/17) Schematic Diagram --------------- 54
11.17. A-Board (16/17) Schematic Diagram --------------- 55
11.18. A-Board (17/17) Schematic Diagram --------------- 56
11.19. V-Board Schematic Diagram -------------------------- 57
11.20. TC-Board (1/6) Schematic Diagram----------------- 58
11.21. TC-Board (2/6) Schematic Diagram----------------- 59
11.22. TC-Board (3/6) Schematic Diagram----------------- 60
11.23. TC-Board (4/6) Schematic Diagram----------------- 61
11.24. TC-Board (5/6) Schematic Diagram----------------- 62
11.25. TC-Board (6/6) Schematic Diagram----------------- 63
11.13. A-Board (12/17) Schematic Diagram --------------- 51
11.14. A-Board (13/17) Schematic Diagram --------------- 52
11.15. A-Board (14/17) Schematic Diagram --------------- 53
11.16. A-Board (15/17) Schematic Diagram --------------- 54
11.17. A-Board (16/17) Schematic Diagram --------------- 55
11.18. A-Board (17/17) Schematic Diagram --------------- 56
11.19. V-Board Schematic Diagram -------------------------- 57
11.20. TC-Board (1/6) Schematic Diagram----------------- 58
11.21. TC-Board (2/6) Schematic Diagram----------------- 59
11.22. TC-Board (3/6) Schematic Diagram----------------- 60
11.23. TC-Board (4/6) Schematic Diagram----------------- 61
11.24. TC-Board (5/6) Schematic Diagram----------------- 62
11.25. TC-Board (6/6) Schematic Diagram----------------- 63
12 Printed Circuit Board ------------------------------------------ 64
12.1. A-Board ----------------------------------------------------- 64
12.2. A-Board ----------------------------------------------------- 65
12.3. TC-Board --------------------------------------------------- 66
12.4. TC-Board --------------------------------------------------- 66
12.5. V-Board ----------------------------------------------------- 67
12.6. V-Board ----------------------------------------------------- 67
12.2. A-Board ----------------------------------------------------- 65
12.3. TC-Board --------------------------------------------------- 66
12.4. TC-Board --------------------------------------------------- 66
12.5. V-Board ----------------------------------------------------- 67
12.6. V-Board ----------------------------------------------------- 67
13 Exploded View and Replacement Parts List----------- 68
13.1. Exploded View and Mechanical Replacement
Parts List --------------------------------------------------- 68
13.2. Electrical Replacement Parts List ------------------- 68
13.2.1. Replacement Parts List Notes ------------------- 68
13.2.2. Electrical Replacement Parts List--------------- 69
13.2.2. Electrical Replacement Parts List--------------- 69
TX-LR37D25
3
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
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
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.)
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.
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.
Figure 1
TX-LR37D25
4
2 Warning
2.1.
Prevention of Electrostatic Discharge (ESD) to Electrostatically
Sensitive (ES) Devices
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 electrostatic discharge (ESD).
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 electrostatic 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.
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
aluminum 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
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
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, aluminum foil or
comparable conductive material).
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
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 ham less 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).
sufficient to damage an ES device).