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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  • Darrell Schiller Oct 16, 2006

    I checked inside today for loose connections and found none. I even pulled the fuse and reinserted it to be sure of no corrosion. I was suspecting a bad relay or something. Remember that the power light stays on. How far into the circuitry would that suggest the problem to be? I am no expert, I just tinker with a lot of success. And I know the high voltage dangers. Can you help me by descibing the shape of the relay if that could be the problem? I was thinking the rectangular shaped component. Thanks for any help you can give me.

  • Darrell Schiller Oct 19, 2006

    I don't know what a scart is. But can you tell from the photo which capacitor(s) might be the one?

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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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Where do you get a capacitor?

Posted on Aug 24, 2008

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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

  • 2 more comments 
  • Omar Urrutia
    Omar Urrutia Oct 16, 2006

    Correction!!!!.........The B+ source not being regulated....

  • Omar Urrutia
    Omar Urrutia Oct 16, 2006

    You rating response is important too.

  • Omar Urrutia
    Omar Urrutia Oct 17, 2006

    To answer your question the relay is of a rectangular shape about 1.5 high x .5 thick and 1.75 wide.
    With the light staying on is still possible the theory of the shutdown circuitry being trigger by a breaking down component.To troubleshoot a problem like this one you will need the service manual so you can check some voltages and check some components with a meter.If the picture quality is good and is not distorted before it shutsdown is even harder to find the problem,any distortion or maybe lines in the picture can guide us in the right direccion.If you dont have the manual and wish to order it you can go to www.servicemanuals.com,If you are familiar with the use of a meter and tv service We can go on until We get right but if you are not familiar you should call for assistance from a servicer.
    If you notice anything different as far as symptoms please let me know.You can post another question and use my name ,I will respond.

  • Omar Urrutia
    Omar Urrutia Oct 17, 2006

    Relays are rated 12 dc and usually of a black color.For me to conclude that a relay might be bad I would have to check some voltages.

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