Question about Sharp LC-13AV4U 13 in. EDTV-Ready LCD Television

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Turns itself off

Sharp LC-13AV4U - turn it on and in ten seconds it turns off. Happens every time. In 10 sec I can't even get to/through menu. Anu Ideas?

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  • Anonymous Nov 29, 2007




  • Anonymous Dec 16, 2007

    Mine turns it's self off after about 10 sec everytime you turn it on. anyone know why?

  • FrunobulaxD May 08, 2008

    Having the exact same problem here too after about 13 months of operation. Local repair shops claim about $100 to repair but won't give any clue as to what module is blown.

  • millerjp Jul 15, 2008

    Same problem, set turns itself off in about 10 secods- it also appears the screen is dim, like the backlight is an issue or the circuitry driving the back light.

  • Anonymous Aug 07, 2008

    Same problem! Love the little TV and it just started turning it self off after a few seconds. Happens every time.

  • JoanRN Sep 12, 2008

    Also having the same problem. Turns itself off after 5 sec.

  • Anonymous Dec 07, 2008

    Same problem, plays 10 seconds and powers off.

  • Anonymous Mar 25, 2014

    it turn off and on in seconds



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Sharp LC-13AV4U - turn it on and in ten seconds it turns off.
Happens every time.
Any Ideas?
This is NOT a fix, this is a permanent band-aid.
All you need is a phillips head and tiny diagonal cutters....
Heck, even a nail clipper would do it.
Just disable that faulty protection shut-down circuit!
Remove all the screws from the back cover
and look at the main board with the
unplugged! power cord towards you.
In the upper right corner of the board, you will find
a tiny red-striped zener diode, labeled as D409.
It is to the right of an electrolytic capacitor marked C403.
Snip this diode, at either end, or snip both ends and discard it.
Re-assemble the TV.....and you just got your tv back!.
I only run mine when I am sitting in front of it,
I never leave it running unattended....just in case!
Don't blame me it yours burns up....but mine is just fine.
The Robot Doctor.

Posted on Dec 13, 2008

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  • nascunce May 05, 2011


  • Mike S Aug 08, 2011

    This worked for me as well. Just snipped D409 and it now is running fine. I just garbage picked this two hours ago. I'll run it awhile and monitor it. Thanks.

  • Teresa W. Apr 03, 2012

    Thank you so much!!! Just did it and worked like a charm!!! Hardest part was getting the back off--finding all the screws. Really appreciate it! Was going to pay an online technician or buy new TV, so you saved me some money!!! Awesome!

  • slukas9020 Aug 07, 2012

    This "repair" was spot on! seems to trouble with these units. Mine has been working for months now and no troubles to report. Thanks Doc!!

  • Lee Lutterman
    Lee Lutterman Nov 13, 2013

    Amazing what the internet can do! typed in the model number of my tv with the similar problem of shutting down after 10 secs, and within in 5 minutes I had it fixed....Thankyou!

  • luis42178
    luis42178 Jan 28, 2014

    Thanks doc! You were spot on! Works like a charm. Saved me having to remodel my kitchen to accommodate a larger monitor! I will heed your precautionary advice regarding not leaving the TV on unattended... Just in case.


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My sharp LC-AV134U Had the turn itself off symptom. I tried freezing and heating the board but I could not pin point the bad component. After a few cycles I could no longer replicate the problem and the set was working. This lasted about 2 weeks at that point suddenly the set was dead with a slight ticking sound. I found D631 was shorted I replaced it with an NTE 506. It has been running for 3 weeks now no problems. I suggest that everyone try a new D631.

Posted on Oct 21, 2008

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Hi, all found this out: If you hold a channel up or down button while you press power, the set powers on without the backlight on and will stay on as long as you hold the button.
On the top left of the main circuit board is a capacitor C403. If you short the + lead to ground then push the power button, the set will stay on! There is a Zener diode D409 next to the cap with it's cathode connected to the + lead. I think this may be part of a protection circuit for the backlight circuit. When the voltage on the cap reaches .6, the set shuts off. Must be turning on a transistor but could not trace due to white paint on board.

Posted on May 30, 2008

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Holding channel up/down didn't work for me. First lost power after multiple seconds of power on. Local authorized dealer could not fix it. Sent this lemon with it's 90 day labor 1 year parts after three months. $140.00 labor, $40.00 return shipping charge and it still failed. Returned it again and it
was fixed. Now after 2 years since purchase, the same problem.

Sharp must have known this was a lemon and made the labor warranty quite short to cover them selves on this lemon.

Posted on Jun 28, 2008

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These sets have a tendency to have bad power supply boards. They have to be replaced as a complete assembly. you should only call out, or take this set to an authorized Sharp repair center my friend. Good Luck

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Sharp LC-13AV4U - turn it on and in ten seconds it turns off. Happens every time.

There is some short with the inside circut of your TV. The short usually occurs with the inverter transformer for backligh bulbs of with video processing section. These tw sections should be checked throrughly to find out the actual short. You must have sound knoledge in digital electronics, skill to work with these section, good quality digital multimeter [analogue multimeter or low quality digital multimeters should not be touched with LCD circuits]. Actually this is not a user repairable fault. If you have all facilities mentioned above check these sections for short. OK.

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Thanks for using FixYa. If you have already checked the capacitors on the power supply board and they seem to be fine then it can be a circuit protection issue. If that is the case the unit either turns off after sometime or the sound remains there. To check what is the issues inspect the diodes as they are part of the protection circuit if the backlight misfires. You can also test the components by a voltmeter however, it is only recommended if you have knowledge of internal circuitry. Please note that the TV components consists high voltages even when in off position. Please do accept the solution if the issue is resolved or post a comment for further assistance.


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