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When i switch ON the TV it automatically switches back OFF in about 2-3 seconds.

I have a Sony Trinitron KVG21Q1 TV. When i switch ON the TV it automatically switches back OFF in about 2-3 seconds. Sometimes i see athin silver line in the centre of the display also none of the lightsin front flashes. What is the problem with my TV?

It is about 7 years old. I was advised by a person, to check around"Vertical Out" area to see if there is any dry solders but i didnt findany.Also i checked the whole board for any dry solders or any shorts or for any burnt components didnt find any.

The tv is old but my grandparents use so it not muchused and they dont want to go to a new one as new tvs are complicatedfor them to use.

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  • FckForcedReg
    FckForcedReg Sep 05, 2008

    Thanks for the solution i will do it let you know about it. Also some time my display doses something like in picture(Pincushion) if i tilt the circuit board or the outer shell it goes of what can cause, this isue started before the TV started switching OFF.

  • FckForcedReg
    FckForcedReg Sep 06, 2008

    I replaced the Vertical IC but still no change the TV shuts off as i switch it on within 2-3 second, but i still can hear clear audio of the channel it is tuned to.



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The vertical IC is faulty and needs to be replaced. Look for a small flat IC attached to a heat sink. It will be marked LA7837 or something similar. Replace that part and update this with your results. That may resolve the problem or at least get you a distorted picture which will indicate a few other parts that need to be replaced.

Keep us posted.

Posted on Sep 04, 2008

  • ABRsvcs Sep 05, 2008

    The picture you posted is inded a problem with the pincushion circuit. Unfortunately I do not have access to the service manual for your model so I can't tell you what part is bad. I can tell you that it is a capacitor in that circuit though. The vertical IC failure would cause the picture to look line a single horizontal line across the tube.

    If by moving either the board or the set the problem gets worse or cured, the problem is likely to be a bad solder connection on the board. Resolder any connections that appear grainy or have rings. That may cure the problem without the need for parts.

    Keep me posted.




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