Question about Magnavox 39MF412B 39" Class LCD 1080p HDTV with Dynamic Contrast

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Magnavox LCD tv model 39MF412B/F7 when we change channel the picture goes black but we have sound. We have to turn the tv off and then back on to get picture.

Posted by Anonymous on

  • Tom M
    Tom M Jan 02, 2014

    I have same model with similar issue. Mine goes to no picture (with audio) when I change channels from low def channel to high def channel. If I cycle through the source selections, it comes back.

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4 Suggested Answers

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Posted on Jan 02, 2017

  • 5099 Answers

SOURCE: I have a 42inch magnavox lcd and it has lost the

Since you have the audio, it's probably a backlight or backlight inverter issue if the problem occurs on all sources and the onscreen menus. (The backlight itself usually fades or makes the on-screen image change to pink/red.) With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing. For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.) The scorch mark and smoke may indicate a resistor or zener diode that had been used as a fuse and is now gone.

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the inverter board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Separate the panel from the bezel. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. See http://www.lcdparts.net/howto/default.aspx for more information but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx. Then push the new backlights into place, reconnect the wires and close up the sandwich of tape and other parts around the screen. Then replace it in the bezel.

With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight.

Unfortunately, I can't give any part numbers. The parts are often shared by multiple makes/models so the part number from your tv is needed.

I hope this helps.

Cindy Wells

Posted on Mar 26, 2011

UberTechzor
  • 295 Answers

SOURCE: i have a 42 in

You were smart to test the image for burned out backlights! :)
Typically, on a screen this size, the backlight inverter is the first place to look.
I found the part number...
27-D026774 Funai TV Module, backlight inverter, PNF10092, I420H1-16A0, 42MF439BF7

You can by it here...

http://www.tristatemodule.com/p-13231-27-d026774-funai-tv-module-backlight-inverter-pnf10092-i420h1-16a0-42mf439bf7.aspx

Posted on Aug 23, 2011

omecron2001
  • 22 Answers

SOURCE: magnavox 42mf439b/f7, no picture or sound

i have set with same problem in my shop and after troubleshooting i found that the problem is in jack mo dual A91h5mjc. when you plug set in you hear relay and turn on when you push power switch after few sec high voltage supply shuts down making light blink. what they did is separate high and low voltage supply's half one one board half on other to confuse everyone.

Posted on Oct 13, 2012

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