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

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Magnavox 42MF438B/F7 Backlight Dimming annoyance. I recently contacted technical support on how to turn off the backlight dimming, but apparently it cannot be done. After doing some forum searching I heard that you CAN turn it off by an option value in the service menu. If anybody has any idea how to do this, please let me know because backlight dimming sucks. :)

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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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3 Answers

Need to find out a part # for my philips 52PFL7403/f7 for the ir sensor


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

May 30, 2011 | Philips 52PFL7403D 52 in. LCD HDTV

1 Answer

How do i turn my kepboard light on?


Set the brightness of the backlighting

1. In the device options, click Screen/Keyboard.

2. Set the Backlight Brightness field.

3. Press the Menu key.

4. Click Save.

Set how long backlighting remains on

1. In the device options, click Screen/Keyboard.

2. Set the Backlight Timeout field.

3. Press the Menu key.

4. Click Save.

Stop backlighting from dimming automatically

1. In the device options, click Screen/Keyboard.

2. Change the Automatically Dim Backlight field to Off.

3. Press the Menu key.
4. Click Save.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response. Happy Holidays!

Thanks, Joe

Dec 17, 2010 | RIM BlackBerry Pearl 8100

1 Answer

I have a 42mf438b/f7 42" magnavox LCD. I turn on the tv and it stays on for about 3 seconds. I see the station and then it goes black. I have sound but no picture. I did some research and thought it was...


The backlight inverter board or the CCFL lights are defective. Since the backlight inverter board is integrated with the power supply, replacing the power supply would be the next step. I would suggest that before replacing the power supply to measure all the voltages going to the main board. If the voltages appear to be low then this could be due to defective capacitors that are swelling or bulging on the top.
Let me know if you require further assistance.

Sep 21, 2010 | Televison & Video

1 Answer

Backlight will not turn on


Cool the old backlight bug...just like ginger people fishing for sprouts which is so not cool.... Oh sorry just thinking aloud have you done that restore yet... it always works on the backlight dimming

Apr 12, 2010 | Sony CLIE PEG-TJ35 Handheld

1 Answer

Magnavox 42 LCD 42mf438b/f7 turns on/off by itself sometimes screen goes blank tv unresponsive to remote


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?

Jul 08, 2009 | SNK Magnavox 42MF438B/27 42 in. LCD TV

1 Answer

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


Mine was doing the same thing. Update the firmware and it fixes the problem. Updating the firmware is done by downloading the file to a thumb-drive from the phillips product support page then plugging in the drive into the side of your television and turning it on. See your manual for slightly better instructions.

Jul 08, 2009 | Philips Magnavox 50ML8105D 50" HDTV DLP TV

2 Answers

Dim screen


A New Backlight, or new bulbs for your backlight..

Jun 09, 2008 | HP Pavilion dv2000t 14.1" Notebook Laptop...

1 Answer

Backlight problem


if this is a new laptop, then I am guessing you are using it on battery, and you may have some power save setting turned on that is dimming the screen...

Take a look at your power settings under control panel...

M

Jan 01, 2008 | IBM ThinkPad T43 Notebook

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