Panasonic gp8du gph8du th-37px50u th-42pd50u th-42px50u th-42px500u th-50px50u th-50px500u troubleshooting Service Manual

 
Please follow these general guidelines before servicing the models mentioned in this 
technical guide. 
 

1.  While servicing, please observe the original lead dress. If a short circuit is 

found, replace all the parts that have been overheated or damaged by the 
short circuit. 

2.  After servicing, please make sure that all the protective devices such as 

insulation barriers, and insulation paper shields are properly installed. 

3.  Some semiconductor (solid state) devices can be easily damaged by static 

electricity. Such components are commonly called Electrostatically Sensitive 
(ES) devices. Examples of typical ES devices are integrated circuits, some 
field-effect transistors (FET) and semiconductor "chip" components. The 
following techniques should be used to help reduce the incidence of component 
damage caused by Electro Static Discharge (ESD). 

4.  Drain off any Electro Static Discharge on your body by touching a known earth 

ground, immediately before handling any semiconductor component or 
semiconductor-equipped assembly.

 

Alternatively, obtain and wear a 

commercially available discharging ESD wrist strap, which should be 
removed prior to applying power to the unit as it may cause an electric shock. 

5.  After removing an electrical assembly equipped with ES devices, place the 

assembly on a conductive surface such as an aluminum foil, to prevent 
electrostatic charge buildup or exposure on the assembly. 

6. Use a grounded-tip soldering iron to solder or unsolder ES devices. 
7. Use an anti-static solder removal device. Some solder removal devices not 

classified as "anti-static (ESD protected)" can generate electrical charge 
sufficient enough to damage an ES device. 

8.  Do not use freon-propelled chemicals. These can generate electrical charge 

sufficient enough to damage an ES device. 

9.  Do not remove a replacement ES device from its protective package until you are 

just ready to install it. (Most replacement ES devices are packaged with leads 
electrically shorted together by conductive foam, aluminum foil or comparable 
conductive material). 

10. Immediately before removing the protective material from the leads of a 

replacement ES device, touch the protective material to the chassis or the circuit 
assembly into which the device will be installed. 
Caution: Please make sure that no power is applied to the chassis or circuit 
assembly, and observe all other safety precautions.

 

11. Minimize bodily motions when handling unpackaged replacement ES devices. 

(Harmless motions such as the brushing together of your clothes fabric or the 
lifting of your foot from a carpeted floor can generate static electricity sufficient 
enough to damage an ES device). 

 

 

 

3