Philips 32PT6441/37 32" TV Logo

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Booysen Mzizi Posted on May 30, 2007

TV PROBLEM philips tv, model 21pt3324/79 keeps on shorting (short circuit) the line output transister (bu11 af), and then the set starts to give a squeking sound, what could be the cause?

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  • Posted on Jun 01, 2007
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After replacing the shorted Line driver Transistor, carefully removing and replacing the same CRT base circuit, resulted with the problem going away. I cannot say what really was the cause, but I suspect that there could have been some form of acing on the neck of the tube.

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  • Posted on May 31, 2007
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This could be caused by 1 of 2 things, firstly the crt could be arcing, check this by taking the tube base away from the tube neck (only do this if you are a qualified engineer, high voltage and all that), secondly your F.B.T. (Fly-Back Transformer) could be up the swanny (faulty). It would be handy to know if the transistor blows instantly. Hope this is of some help to you, please email me if you require anymore assistance [email protected]

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You just start with the horizontal output transistor, fitted very close to Line Output Transformer [LOT], for any short. You must desolder it out from the circuit for this check, and check it for collector to emitter leak. If this will happen, the main regulated power supply ie 120VDC, will gets shorted through this transistor, cause a dead short circuit. If it is shorted, you must find out the reason for that short.

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