Question about Philips 28PW6506 28" TV
Hi i have a philips 28pw6506/05 set (28inch) that is L01.1E It does not like to start and goes into standby for maybe 6 to 20 times. there is no error codes coming up on sam but i have the service man and the schematic for it. The BC337-25 seems to be a common thing with them ref 7461 & 7463 plus cap 2455 which appears to be 47mf 35v.. that is from a similar set with same problem. My problem is i cannot find the values for BC337-25 in the service manual and i have found maplin does a BC337-16 which i am sure is very different from what i want. I have found other suppliers that appear to have alternatives but without the values i cant choose the correct ones. Maybe you know where i can get the parts i need and any info on if i am on the right track would be good, it did come up with error 5 and 7 but since i cleared the errors there has not been any!!!!! Strange well i think it is?
Is this going down the right track to fix my problem?
Thanks for your input and taking the time to read this
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.
Posted on Apr 13, 2008
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This is typical with many sets when it goes old as there is a high possibility that the components over a period of heating and cooling , tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs.
Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points. Please find below two links for tips on poor start ups, as if the set is totally failed the SMPS might be faulty
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