Question about Philips 32RF52S 32" TV
The subject set doesn't power up. After investigating, high voltage will come up for a few seconds, then it powers down. The front panel LED flashes with 2 short flashes. Any suggestions?
If there is a failure in any of the scan circuits, the set will go in to protect mode. This is most probably what is happening.
Before starting to work on a TV set is is best to have the full shop service manual with the schamatics, with all the required service details about the set.
The fault can be any of the components in the associated cricuits. This can be a bad cap, open resistor, or a failed semiconductor.
In the case where a set is going in to the protect mode, it is difficult to take voltage readings, because the power supply is being partialy shut down. The parts of the supply that runs the high voltage and scan circuits are shut down, and also the uPC makes sure that the CRT is biased off to protect it.
It is most common that capacitors go out of specs with age. To properly test the caps you would need a cap an ESR meter. The other way to test caps is to replace them until you have worked out all the defective ones. This is shotgunning for a bad cap. With this method, you an end up changing a lot of caps, and they were not the fault.
In the case of the other types of components a DVM can be used to check them. IC's must be changed to properly check them. It is impossible to properly check an IC just with a DVM.
This is an idea of what troubleshooting is.
Posted on Apr 21, 2008
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