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TV Turns off automatically

Just can not turn it on anymore. never had theis issue before my tv will be on for a while....and then poof! turns off and wont turn back on unless I unplug it and plug it back in. Sometimes that doesn't even work until I wait like ten minutes or so. Sometime hitting it works too. (I got frustrated) If you know how I can fix it myself I'm all ears.

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  • Bryan_Kiefer Jul 04, 2008

    my tv will be on for a while....and then poof! turns off and wont turn back on unless I unplug it and plug it back in. Sometimes that doesn't even work until I wait like ten minutes or so. Sometime hitting it works too. (I got frustrated) If you know how I can fix it myself I'm all ears. I have a 32" Sharp standard tube tv. Not sure of the exact model. It's about 7 years old.

  • Bryan_Kiefer Jul 04, 2008

    Can I replace the tube so it holds the power?

  • Bryan_Kiefer Jul 04, 2008

    So, if it's a case of cold solder issues, please help me understand why it stays on for awhile, (most times 20min. somethimes days.) Also, if I hit it, it seemes to be the most effective although I would rather not keep doing that but that tells me something might be loose. (????) I'm not an electronic guy, so I don't quite understand.

  • Bryan_Kiefer Jul 05, 2008

    Thanks. I think I will take it in to a repair shop.

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That is the oscillation sound comes from the relay,cannot continue because of protection mode,by the system.. Your tv parts is ok.only the solder joint is crack or cold thats why function abnormally,goes off and goes on, due to the voltage trap, when voltage is there the solder is hot and connect the parts joint, when voltage extremely hot, due to prolong use it will disconnect the solder joint parts thats why you cannot see picture..its need to reheat the solder joint of all parts affected....power supply section ,,horizontal section,vertical section ..and to microprocessor ic section including jungle ic..
find a tv technician to do the works .in order to avoid high voltage shock this not cost too much because only reheating works....

Posted on Jul 04, 2008

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I think some component is getting over heated inside so you are facing this type of problem ....
the component may be transformer,capacitor on some circuit board ...
due to this temperature variation you tv will turn off ...
or may be some IC(intergrated circuit ) is gone ...
there will be one Video IC if it is gone means also you will this problem ...
if it is gone it will get heated very shortly so the tv will turn off due this variation in temperature ...

just have a check with these components.......


Posted on Jul 04, 2008

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Hi,

Based on your description, it would appear to be a case of cold solder issue (most likely) or heat related (just a possibility) or both interrelated.

Repairs wold require the application of a low wattage soldering iron at the determine cold solder joints. They can be determined by checking for those that are dull grayish in color as compared to the regular/good bright silvery. Should you not be able to determine the exact cold solder joint, a shotgun approach would also do. This is re-soldering most of the major joints with particular attention to the power devices such as the bridge diode, regulator IC, chopper transformer, capacitors in the power supply; the vertical IC; the flyback transformer pins and the Horizontal out. Often, the major joints would be bigger than the regular solder joints.

The above of course requires familiarity with electronic circuitry and components, use of a soldering iron and perhaps even a DVM. Should you be uncomfortable, then perhaps your best bet wold be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back on the model number how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 04, 2008

  • Louie  Role
    Louie Role Jul 04, 2008

    Hi again,

    Appreciate the postback....

    cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the TV turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

    Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

    Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing the inside of a TV unit for any lay/unexperienced repair person.

  • Louie  Role
    Louie Role Jul 04, 2008

    This might be of help to you.



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Greetings,

Your tube is experiencing power supply failure. Can't sustain electrical power for the whole system.

If you do electronic troubleshooting, check the power supply section. Else, get a qualified repairman.

Keep us posted and thank you for using our service.
FixYa for all your troubleshooting needs.

Posted on Jul 04, 2008

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Your tv is having powersupply problem

smps might not be working properly check it

the power supply is not reaching the main board properly

give details about your tv - make and model number

Posted on Jul 04, 2008

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