TH-50PB2E — Panasonic Plasma Service Manual (repair manual)

Model
TH-50PB2E
Pages
54
Size
4.61 MB
Type
PDF
Document
Service Manual
Brand
Device
Plasma / GPF16DMON CHASSIS
File
th-50pb2e.pdf
Date

View Panasonic TH-50PB2E Service Manual online

ORDER NO.PCZ1305123CE
Interactive Plasma Display
Model No.
TH-50PB2E
GPF16DMON Chassis
2
TH-50PB2E
TABLE OF CONTENTS
PAGE
PAGE
1 Safety Precautions -----------------------------------------------3
1.1. General Guidelines ----------------------------------------3
1.2. Touch-Current Check--------------------------------------3
2 Warning --------------------------------------------------------------4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically 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
4 Specifications ------------------------------------------------------9
5 Service Mode ----------------------------------------------------- 11
5.1. CAT (Computer Aided Test) mode ------------------- 11
5.2. IIC mode structure (following items value is
sample data)----------------------------------------------- 15
5.3. Option - Mirror--------------------------------------------- 16
6 Troubleshooting Guide---------------------------------------- 17
6.1. Self Check ------------------------------------------------- 17
6.2. No Power--------------------------------------------------- 19
6.3. No Picture -------------------------------------------------- 19
6.4. Local screen failure-------------------------------------- 20
6.5. Failure diagnosis when a character cannot be
drawn with an electronic pen-------------------------- 21
6.6. Failure diagnosis when electronic pen cannot
charge with a charger ----------------------------------- 26
6.7. Failure diagnosis at the time of wireless LAN
fault ---------------------------------------------------------- 27
7 Service Fixture & Tools --------------------------------------- 28
7.1. SC jig -------------------------------------------------------- 28
8 Disassembly and Assembly Instructions--------------- 29
8.1. Removal of Rear Cover--------------------------------- 29
8.2. Removal of Slot Block----------------------------------- 29
8.3. Removal of DS-Board----------------------------------- 29
8.4. Removal of HX-Board----------------------------------- 29
8.5. Removal of Speaker------------------------------------- 30
8.6. Removal of A-Board ------------------------------------- 30
8.7. Removal of Fan------------------------------------------- 30
8.8. Removal of P-Board ------------------------------------- 31
8.9. Removal of AC Inlet Assy ------------------------------ 31
8.10. Removal of H3-Board ----------------------------------- 31
8.11. Removal of SU-Board and SD-Board--------------- 32
8.12. Removal of SC-Board----------------------------------- 33
8.13. Removal of SS-Board----------------------------------- 33
8.14. Removal of SS2-Board --------------------------------- 33
8.15. Removal of C1-Board ----------------------------------- 34
8.16. Removal of C2-Board ----------------------------------- 34
8.17. Removal of C3-Board ----------------------------------- 35
8.18. Removal of S1-Board ----------------------------------- 35
8.19. Removal of Front Glass, V1, V2-Board and
Cabinet Assy ---------------------------------------------- 35
8.20. Removal of Plasma Display Panel------------------- 37
9 Measurements and Adjustments -------------------------- 40
9.1. Adjustment ------------------------------------------------- 40
9.2. Adjustment ------------------------------------------------- 41
10 Block Diagram --------------------------------------------------- 45
10.1. Main Block Diagram  ------------------------------------ 45
10.2. Block (1 of 6) Diagram ---------------------------------- 46
10.3. Block (2 of 6) Diagram ---------------------------------- 47
10.4. Block (3 of 6) Diagram --------------------------------- 48
10.5. Block (4 of 6) Diagram --------------------------------- 49
10.6. Block (5 of 6) Diagram --------------------------------- 50
10.7. Block (6 of 6) Diagram --------------------------------- 51
11 Wiring Connection Diagram -------------------------------- 53
11.1. Wiring (1) -------------------------------------------------- 53
11.2. Wiring (2) -------------------------------------------------- 54
3
TH-50PB2E
1 Safety Precautions
1.1.
General Guidelines
1. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
2. 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.
3. When conducting repairs and servicing, do not twist the Fasten connectors but plug them straight in or unplug them straight
out.
4. 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.
5. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
6. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
7. Do not repair or replace the rechargeable battery built into the electronic pen.
There is a danger of explosion if repaired or replaced.
When you discard the electronic pen, please dispose of the used battery according to an operating instructions.
1.2.
Touch-Current Check
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a measuring network for touch currents 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 Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reserve the AC plug in the AC outlet and repeat each of the above measure.
6. The potential at any point (TOUCH CURRENT) expressed as voltage U
1
 and U
2
, does not exceed the following values:
For a. c.: U
1
 = 35 V (peak) and U
2
 = 0.35 V (peak);
For d. c.: U
1
 = 1.0 V,
Note:
The limit value of U
2
 = 0.35 V (peak) for a. c. and U
1
 = 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and 2.0
mA d. c.
The limit value U
1
 = 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.
7. In case a measurement is out 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
4
TH-50PB2E
2 Warning
2.1.
Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensi-
tive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec-
trostatically 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.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alumi-
num 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, aluminum foil or compara-
ble 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 ham less motion such as the brush-
ing 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).
5
TH-50PB2E
2.2.
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 PbF 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 sol-
der. 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. How-
ever, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.

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Here you can view online or download Panasonic TH-50PB2E Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Panasonic TH-50PB2E Plasma. Information contained in Panasonic TH-50PB2E service manual (repair manual) typically includes:

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  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).