Question about SNK Magnavox 42MF438B/27 42 in. LCD TV

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I have a magnovox 42 inch tv model number 42mf438b/f7 and it has a built in screen shut of sensor for when the tv starts to get too hot. It is 16 months old and the sensor has been turning the screen of sooner and sooner over time to the point where it now goes off after about 15 minutes of play time. I did notice that when I unplug it for a while it takes significantly longer (over an hour) before the screen shuts off so the tv must be retaining some heat when it is plugged in and turned off or there is some other reason for this phenomenon. Any help or information would be appreciated.

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SOURCE: Magnavox 42 LCD 42mf438b/f7 turns on/off by itself

I have exactly the same problem with a Magnavox LCD 42", very similar model 42MF437B/37. I don't have a solution. If you unplug the TV and plug it back it starts working, sometimes for hours, sometimes for less than 5 minutes, before it turns off again. Does anyone have any real solution?

Posted on Aug 01, 2009

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How to take base off magnavox tv 42MF438


Remove the machine screws that attach the base to the rear of the TV.

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What is the best lcd tv (Samsung or LG) 42 inch ? And what is the differences?


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Join Date: Nov 2011 I have a Philips 47PFL3603D/F7 with the same problem. It was the IR sensor board causing the problem. You can search online to find the board, which almost everyone will most likely not have in stock, and cant be ordered. The part you need is this: 313926859181 IR Remote Sensor.

Models it will fit are as follows: Substitute Parts 313926859182
Known Models
MAGNAVOX 42MF438B/27
MAGNAVOX 42MF438B/27
MAGNAVOX 42MF438B/F7
MAGNAVOX 52MF438B/27
MAGNAVOX 52MF438B/F7
PHILIPS 32PFL3403D/85
PHILIPS 42PFL3403D/27
PHILIPS 42PFL3403D/F7
PHILIPS 42PFL3603D/27
PHILIPS 42PFL3603D/F7
PHILIPS 47PFL3603D/27
PHILIPS 47PFL3603D/F7
PHILIPS 52PFL3603D/27
PHILIPS 52PFL3603D/F7

If you can find the board, great! A replacement board costs about $12.00. If you can't... we'll there is something you can try ; )

Either way, if you know it's the board, what's the harm in trying?

Remove the back from the TV. You can actually leave it on your stand to do this if you can spin it around to gain access to the back of it. Be sure to unplug everything first!!!

Looking at the back of the tv, the board will be located in the lower left side by the speaker. It will have 2 cables attached to it. Remove them, and take out the screw or two that holds it in place. There will be a plastic tab that keeps it in place also.

Take your fingernail and bend the tab back, and the board should come free. After that you should be holding the board in your hands. The side of the board with the connectors on it is the side you want to manipulate. There will be a tiny surface mounted capacitor beside one of the wire connection sockets. Take a utility knife and scrape it off/ you could use a soldering iron but it should come off very easy with a knife.

Plug it back in, and give it a try! If it works... great! If not, find a replacement board, and try that.

Hope it helps someone!!!! quote.gif

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1 Answer

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Some of these TV were equipped with very short connections from the infared board to the small signal board. Remove some of the shrink tubing from the wires of the IR cable to relieve stress on the individual wires. Trim the other end of the cable as well. We are talking about one half to three quarters of an inch.If this does not help you will need to order a new IR cable. Please show this info to an authorized Philips dealer and have them do this for you. Thanks for asking and show a few hands of support.

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I have exactly the same problem with a Magnavox LCD 42", very similar model 42MF437B/37. I don't have a solution. If you unplug the TV and plug it back it starts working, sometimes for hours, sometimes for less than 5 minutes, before it turns off again. Does anyone have any real solution?

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