Toshiba 42WP37C Manuale utente

SERVICE MANUAL

Plasma Display

42WP37C

42WP37E

42WP37F

42WP37H

FILE NO. 010-200325

Mar. 2004 (YC)

– 2 –

1 Applicable signals 3

2 Safety Precautions 4

2.1. General Guidelines 4

3 Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices 5

4 About lead free solder (PbF) 6

5 PCB Structure sheet of GP6D chassis 7

6 Service Hint 8

7 Location of Lead Wiring 9

8AdjustmentProcedure 10

8.1.DriverSet-up10

8.2. Initialization Pulse Adjust 11

8.3. P.C.B. (Printed Circuit Board) exchange 12

8.4. Adjustment Volume Location 12

8.5. Test Point Location 12

9 Service mode 13

9.1. CAT (computer Aided Test) mode 13

9.2. IIC mode structure (following items value is sample data.)

10 Alignment 16

10.1. 625i/625p panel white balance 16

10.2. PC/RGB panel white balance 18

10.3. HD panel white balance 19

11 Trouble shooting guide 20

11.1. Self Check 20

11.2. No Power 20

11.3. No Picture 22

11.4. Local screen failure 23

12 Conductor Views 25

12.1. PF-Board 25

12.2. P-Board 26

12.3. HX-Board 29

12.4. HV-Board 30

12.5. HZ-Board 31

12.6. HT-Board 32

12.7. J-Board 33

12.8. D-Board 35

12.9. C1-Board 37

12.10. C2-Board 38

12.11. SC-Board 39

12.12. SU and SD-Board 42

12.13. SS, SS2 and SS3-Board 43

12.14. Z-Board 45

12.15. V1, S1 and H3-Board 46

CONTENTS

Page Page

42WP37

14Parts Location

Replacement panel handling precautions and replacement

procedure

15Chassis and Cabinet Replacement Parts List 51

16Specifications END

Appendix

Block and Schematic Diagrams

–3 –

1 Applicable signals

42WP37

–4 –

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

1M9and 5.2M9.

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 1.5k9, 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.

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.

42WP37

–5 –

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).

42WP37

–6 –

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.

42WP37

–7 –

5 PCB Structure sheet of GP6D chassis

Board Name Function Remarks

DDigital Signal Processor 1

JSlot Interface & SYNC processor 1

ZAudio out, DC-DC converter

SS Sustain Out 1

SC Scan out 1

SU Scan connection (Upper) 1

SD Scan connection (Lower) 1

C1 Data Drive (Lower Right)

C2 Data Drive (Lower Left)

H3 Speaker terminal

S1 Power switch

SS2 Sustain connection (Upper)

SS3 Sustain connection (Lower)

V1 Front SW. & Remote receiver

PF Line filter

PPower supply 1

HX PC_type_Input terminal

HZ (RTB033) RCA Component Video terminal

HV (RTB031) RCA Composite Video terminal

HT (RTB032) 21pin SCART terminal

Remarks

1. Recommend PCB´s for initial service for GP6D chassis.

42WP37

–8 –

6 Service Hint

42WP37

SS3

–9 –

7 Location of Lead Wiring

42WP37

–10 –

8.1. Driver Set-up

8.1.1. Item / Preparation

1. Input an APL 100 % white signal.

2. Set the picture controls: -

Picture mode: Normal

White balance: Cool

Aspect: 16:9

8.1.2. Adjustments

Adjust driver section voltages referring the panel data on the

panel data label.

Use a non conductive tool for adjustment.

Name Test Point Voltage Volume Remarks

Vsus TPVSUS

(SS)

Vsus* ± 1V R605 (P)

Vbk TPVBK (SC) 155V ± 5V R6443 (SC)

Ve TPVE (SS) Ve* ± 1V R6774 (SS)

Vad TPVA (SC) -90V ± 1V R6477 (SC)

Vda TPVDA (SS) 67V ± 1V R590 (P)

*See the Panel label

8 Adjustment Procedure

42WP37

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