Plasma Television - Super TV Servis M+S

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TH-37PV60E / TH-37PX60B / TH-42PV60E / TH-42PX60B 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. 2.2. 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 (TOUGH 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 =1.0V, 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 6
TH-37PV60E / TH-37PX60B / TH-42PV60E / TH-42PX60B 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). 7
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TH-37PV60E / TH-37PX60B / TH-42PV60
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13.10. C1-Board (37inch) 6 5 4 3 2
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1 1 TH-37PV60E / TH-37PX60B / TH-42
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A B C D E F G H I 1 2 3 4 5 6 C708
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1 2 1 2 4 3 4 3 TH-37PV60E / TH-37P
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R488 100K R483 4.7M R461 10K ZH61 R
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3 4 3 4 2 2 2 2 1 2 1 3 3 3 TH-37PV
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+ TH-37PV60E / TH-37PX60B / TH-42PV
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14.55. C1-Board (2 of 2) Schematic
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14.65. SC-Board (2 of 2) Schematic
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14.67. SU-Board (2 of 2) Schematic
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14.69. SU-Board (2 of 2) Schematic
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14.71. SD-Board (2 of 2) Schematic
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14.73. SD-Board (2 of 2) Schematic
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14.75. SS and S-Board Schematic Dia
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Plasma Television - Super TV Servis M+S

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