Question about Sharp LC-13AV4U 13 in. EDTV-Ready LCD Television
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?
Sharp LC-13AV4U - turn it on and in ten seconds it turns off.
Happens every time.
DO THIS AT YOUR OWN RISK!
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
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
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
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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