Question about Philips Magnavox 27MS343S 27" TV

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Magnavox 19" TV shuts itself off.....won't stay on

I purchased a new Magnavox LCD TV (Model# 19MF337B/27 in April of 2008 from BEST BUY, of Annapolis, MD. I was naturally hoping to have years of trouble free use from the TV as Magnavox has a fine reputation.

After approximately 1 year of trouble free service a problem with the TV developed. It has become extremely difficult to turn the unit on. It shuts itself off repeatedly and then turns back on for a few seconds This process can last up to 20 minutes each time the TV is turned on.

Now the sound won't come on, even when the picture remains on.

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I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
Solutions?
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.

Hope this helps

Posted on Dec 09, 2010

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1 Answer

When the TV is turned on it plays for up to a minute then a loud screeching sound comes over the speakers and the TV shuts off. Is there a solution to this problem or should we buy a new TV?


The entire tv shutdown,uncluding the power LED light indication on the front of the LCD screen panel of the tv also?Yes,than this causes,it by the tv power supply board.That the board,where the power a/c cord plug ito it.Tries websites like Shopjimmy.com,Ebay.com buy a whole refurbish power supply board for the replacement.

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I have a Magnavox 19MF337B, and it powers on and off a few times before staying on. After it powers on, I just get a white screen, and nothing else works. remote does nothing, and buttons on top do...


In some cases these TVs were to be returned for exchange. As costs were excessive. If this TV is out of warranty and you have no place to go with this TV, you might just have a hobbiest open the darn thing up. I would say you have a bad capacitor or two in the power supply. This is at its easiest repair. If not you may have a bad LCD panel and that is not worth replacing! Hope I could give a something to work with. Thanks for asking!

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Magnavox 19mf337b/27 will turn off and back on with loud noise through the speakers until it warms up. approx 30 to 40 min. What is the part causing this common problem?


Check the 2200uF capacitors for bulging. You can get the schematic here to really toybleshoot: http://www.electronica-pt.com/index.php/component/option,com_remository/Itemid,34/func,download/id,15048/chk,6022df47696641c1c064cb27f2bd7d11/no_html,1/

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1 Answer

Magnavox 15inch lcd shuts itself off


I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
Solutions?
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.

Hope this helps

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If the cost of repair is 50% or more of the price you purchase the TV at, your better off buying a new TV.

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