Philips 28inch tv problems getting it to turn on!!!!!!!
In your set there are some more caps that have become thermo sensitive. You can find these with Freeze Spray and a heat gun by using the technique of heating and cooling to provoke the fault. Since your set works hot, freeze the suspect caps, and then turn on the set. While the set is running, carefuly heat them one at a time until you get the failure.
Any electronic device should reliably work from turn on, through to shut down for any period of time. If there is a characteristic change, then there is a fault. The exception is for critical instruments where the instructions indicate that there is a warm up period.
The main areas of consern in your set for this type of fault would be the horizontal output stage, vertical deflection stage, pin amp area, and especialy the power supply area.
As for capacitor specs, you can use a higher rated voltage. In fact a higher voltage rated cap is better for its lifespan. As for the uF of the cap, for bypass applications and for common ripple filtering this is not critical. Only in circuits that use the cap value for pulse width or in resononance for an application the value will be critical. In the case where the cap is in series with a device that is dependent on the accuracy of the cap value, then the proper value is best to use. The cap voltage is not critical in these cases.
What is also better with caps is to use the high temp rated ones. We use 105 Deg Cels rated caps with all replacements. We try to us higher rated voltage as long as the cap will mechanicaly fit in to the required position.
With experiance, time, and patients your set is easily fixable.
Nov 01, 2007 |
Philips 28PW6506 28" TV