Question about Symphonic ST420FF 20" TV

5 Answers

Symphonic WF20L6 20" TV

Television comes on and then goes off after just a minute or two.

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  • saqerhussein Nov 06, 2007

    is the same problem comes and goes off less than2 seconds

  • JasonEMT Dec 02, 2007

    TV turns off after about 30 seconds.

  • Cynco Dec 12, 2007

    I am having the same problem with the tv turning off after 30 seconds. What has anyone done to get this problem resolved.

  • scran Dec 16, 2007

    I have the same problemw with the T.V. Has anyone found a solution to the problem?

  • Anonymous Dec 21, 2007

    tv goes on then and then stops working

  • Anonymous Mar 10, 2008

    TV comes on within two minutes, the sound is gone and will
    not come back on. By the way, this set was given as a
    Christmas Gift December 2007.


    Willie M. Burton

  • pjfrific Mar 11, 2008

    I am having the same problem. My TV is just over a year old when it started this. It comes on fine. After just a couple of minutes it goes off. I can turn it on again, but it stays on just a few seconds before it turns off again. It does this repeatedly. It will NOT stay on. My opinion is that something is getting hot and shutting it down. A friend suggested i get one of those compressed air cleaners to blow it out in case there is any dust in it, but I have not tried that. Hmmm...i was hoping to find a solution on-line. This is sad- obviously a faulty TV. This was a WalMart after Thanksgiving special in 2006.

  • hallslawn123 Jun 20, 2008

    tv will only stay on a few minutes then goes off.

  • talkinterry2 Sep 08, 2008

    Power problem apparently a common problem with this TV. I also bought at Walmart at the end of 2006. Has anyone actually found what the real problem is?

  • Anonymous Dec 17, 2008

    tv turn off after 30 Is this the inverter as well?

  • Anonymous Jan 05, 2009

    Warranty expired....after a year finally gave in and took it to get fixed....should cost $120.....been waiting on part about 3 weeks....supposedly coming from overseas....will post when finally resolved

  • ejtiger914 Feb 03, 2009

    TV comes on for less than a minute and goes off, I brought it to the tv repair shop & received estimate for $100 with 90 days warranty only & no gaurantee as how long the inverter might last. I am not sure I want to spend more money on it, I bought it from Walmart two years ago.

  • Roscoe007 Feb 14, 2009

    same here

  • Anonymous Mar 11, 2009

    TV comes on for 10 sec then shuts off. pls help!



5 Answers

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Easy fix!!!!!!! CUT JUMPER 300 on main board _ [FACTORY DEFECT] protection jumper
If you have a warranty take TV back to store if not easy fix.

Posted on Jul 26, 2009

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  • johnandre001 Jul 05, 2011

    That worked great thanks for the help!!

  • Pgskr8 Feb 21, 2012

    I just tried this and the TV doesn't turn off now! Thanks . I wonder, what caused it to begin with and is there a fire hazard now or any other potential issue?

  • Pgskr8 Feb 21, 2012

    Thanks Shonbrie



The problem is on the inverter's voltage regulators. Zener diodes labeled d808/9 and npn transistors (any of 11) c3199. Also on the mainboard burnt out 12v supply to inverter. Anyone brave enough can disconnect the inverter and tv won't switch-off by itself. Funai made a gaffe in the design of several LCD tvs.

Posted on Sep 10, 2008

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Power supply faulting for internal problem..accordianman

Posted on Oct 20, 2007

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I suggest to change transistor K3869 and Capacitor Ceramic B 1c2k 2kuv sec that is in front of transistor

Posted on Jun 24, 2008

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Problem is on inverter board-D308 zener diode{6.2v]

Posted on Jun 21, 2008

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