Question about Toymax Magnavox 47MF437B 47 in. LCD TV

1 Answer

Lcd 47 inch magnavox wont come on all the way

Starts to come on for a second or two then goes back off

Posted by russell reichart on

Ad

1 Answer

Tom Russo

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    New Friend:

    An expert that has 1 follower.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 30 Answers

Check capacitors on power supply

Posted on Oct 15, 2012

Ad

1 Related Answer

freetek

Steve Allison

  • 5569 Answers

SOURCE: indicator shows that my 47 inch magnavox lcd is on

Probable failed power supply; switching power supplies can fail and produce this kind of noise.
My standard response is pasted below:
If it's failing to turn on, the main power supply is probably at fault and without some technical background and a couple of test instruments, you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for a separate board with mostly larger components on it; it will have a ferrite core (no laminations as with a line-frequency part) transformer on it and several larger capacitors which are cylindrical and mounted vertically to the board.

Before touching anything inside, especially on that board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.

If you see signs of overheating such as discoloration of the board material, the PSU may not be repairable but if you can find a part number on the board, you might be able to buy the power supply from the mfr. and install it yourself but it will likely have the same problem eventually unless they have altered the design or improved component quality.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the main power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload

Posted on Nov 03, 2009

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Can't connect to Internet on my Magnavox 47mf437b/47


If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

Jun 11, 2016 | Toymax Magnavox 47MF437B 47 in. LCD TV

1 Answer

How to fix no video, nor sound Magnavox LCD TV


Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis.

Jul 19, 2014 | Philips Magnavox 52MF437S/37 52 in. LCD TV

1 Answer

Magnavox tv lcd 47" wont turn on it, use to have unplug from the wall wait a wile then it would turn on ,now it wont turn on anymore


I don't have a model number,but am willing to tell you that this is a classic problem. Magnavox LCD TVs have had bad capacitors that will prevent them from starting up and staying on. Thanks for asking and show a few hands of support!

Oct 07, 2010 | Philips Televison & Video

1 Answer

The plasma lcd wont power on


Your set is equipped with an LCD display which is not 'plasma;' they are fundamentally two different types. The failure is probably a very common one, the main power supply has failed if you have neither video nor audio.

Mar 15, 2010 | Magnavox 42MD459BF7 47 in HDTVReady TV

1 Answer

Magnavox 32 inch lcd wont come on. At first screen began to get dark when turned off that night wouldn't come back on. HELP


very likely it has a bad cap in the power supply
if you are qualified , and know how to check the caps are in the powersupply section look to see if one or more caps have bulged at the top of the cap
if you can't find any you will need to call a service tech

Mar 01, 2010 | Astar Magnavox 19MD358B 19 in. LCD TV

2 Answers

Indicator shows that my 47 inch magnavox lcd is on but there is no sound or picture and i can hear a high pitched wining sound coming from the back of tv. Does anyone know what this problem is?


Probable failed power supply; switching power supplies can fail and produce this kind of noise.
My standard response is pasted below:
If it's failing to turn on, the main power supply is probably at fault and without some technical background and a couple of test instruments, you will not be able to do the repair yourself.
What you can do though is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for a separate board with mostly larger components on it; it will have a ferrite core (no laminations as with a line-frequency part) transformer on it and several larger capacitors which are cylindrical and mounted vertically to the board.

Before touching anything inside, especially on that board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.

If you see signs of overheating such as discoloration of the board material, the PSU may not be repairable but if you can find a part number on the board, you might be able to buy the power supply from the mfr. and install it yourself but it will likely have the same problem eventually unless they have altered the design or improved component quality.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the main power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload

Nov 03, 2009 | Toymax Magnavox 47MF437B 47 in. LCD TV

Not finding what you are looking for?
Toymax Magnavox 47MF437B 47 in. LCD TV Logo

Related Topics:

65 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toymax Televison & Video Experts

matt martin
matt martin

Level 3 Expert

1258 Answers

CoppellTVRepair.com

Level 3 Expert

778 Answers

Marvin
Marvin

Level 3 Expert

85239 Answers

Are you a Toymax Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...