Question about Philips 27MT3305 27" TV

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Shuts Off Immediately

Powers on for only for only 4-5 seconds with picture and sound, then shuts off unless you continuosly change chanels. And after shutting off, the 'power on' light stays on until you hit power off. Then it can be turned on again and does the same thing.

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Re: Shuts Off Immediately

Does the TV shut off if a signal from the scart is selected? Philips sets have an annoying habit of going into standby after a very short time if there is no video for the synchronising circuits to lock onto. I find this a nuisance when I am searching for a signal from satelites when you move the dish. By quickly changing channels you are resetting the shut down circuit. This must be a time-out circuit controlled by a capacitor charging (I suspect) which has gone low in value, probably electrolytic. Replacing the capacitor should solve the problem.

Posted on Oct 17, 2006

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Re: Shuts Off Immediately - Philips 27MT3305 27" TV Standard (CRT) Televisions

Where do you get a capacitor?

Posted on Aug 24, 2008

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Re: Shuts Off Immediately

The changing channels part is trowing me off,my first attempt will be to hit the tv on the side to see if it reacts or behaves different,you can try it while you are changing chanels to see if when you stop stays on,what we are looking for is a loose conection witch will be easy for you to take care of,if the set continuos to shutdown it might have a problem in the shutdown circuitry(rare)and being activated without a reason or a component is breaking down and is triggering it.When you change channels the current for the brighness changes constanly and it might not reach the poit of breakdown the triggers the shutdown.Another reason might be the B+ source for the output transistor is too high and being regulated therefore every voltage in the secondary of the output transformer is too high and that will trigger the shutdown circuit. If you are familiar with tv service you have a place to start but if you are not too familiar be safe and call for assistance.Let Us know how it goes.

Posted on Oct 16, 2006

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1 Answer


This sounds like a serious overload of the power supply circuitry - as the TV tries to start up, it is sensing an overload and therefore shuts itself down to protect itself (and you if it overheated).

Primary causes of such overloads in older TVs is a fault in the power supply circuitry itself, or a fault in the line output circuitry (the bit that generates the high voltages TV's use, and also the bit that scans the picture left to right).
Both types of fault require expertise and test equipment well beyond DIY level, to diagnose and repair.

Suggest you call a repair shop who should give you a free estimate as to likely cost of repair. Then you can decide if it worth it or not.

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