Question about SNK Magnavox 32MF338B27 32 in. LCD TV

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Screen comes on ... no sound or picture only header info, at top with channel info.... then the screen goes dark not any thing .

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  • SNK Master
  • 1,213 Answers

The power supply startup resistors on the inverter board may have changed values. Youwill have to replace the inverter board. Thanks for asking !

Posted on Aug 04, 2010

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Posted on Jan 02, 2017

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1 Answer

My screen will not come on


Replace it with a new LCD Inverter, you can address the following issues:
Screen image, but the power light stays in
Dark display, but still readable
Flashing on and off of the screen between 1/2 to several seconds
The power indicator stays on, but no display and sound
Screen images, but LCD TV still has sound
Picture cycle on and off, as well as high-power LED lights
More information in: http://lcdinverter.info

Feb 26, 2013 | Archos 70 Internet Tablet

1 Answer

When I turn on tv the picture comes on for about a second then goes dark. Sound works perfectly. Same thing occurs with every other channel. Same thing happens in dvd mode., sound but no picture. I have...


Sounds like it could be a bad inverter for the screen lamp. If it is a bad inverter and the tv is still under warranty you should send it back for a replacement or repair. If the tv is not under warranty and you have some experience working on electronic devices you could probably find a replacement inverter online and replace the bad one.

May 20, 2010 | Audiovox VE927 9 in. Portable TV

1 Answer

Screen comes on then goes dark turn it back off and same thing comes on and then goes dark you can barley make out imagies on screen


If you plan to DIY repair, then please read below and look at the pictures at the link I provide so you will know what to look for inside the monitor.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

May 10, 2010 | Computers & Internet

1 Answer

Monitor turns on then goes dark


Either the power supply board is failing and needs repair or a bad bulb in the screen is causing it.
You would have to open it up to get a better idea.

Here's some info:
MAKE SURE ALL POWER is DISCONNECTED For at least 5 minutes PRIOR TO WORKING ON inverters.
If your picture wasn't pinkish or dark at the top or bottom when it was working, then it may be the inverter has gone bad. Inverters are like light bulbs and have life expectancies on the capacitors.
If your picture was pinkish or dark at the top or bottom when it was working then you may have 1 or more of the bulbs failing.
You can check for pinkish if your screen flashes.
What you do is when you have it open to the point of getting to the wires that hook to the back of the lcd screen is to disconnect only the wide ribbon that goes from the video board to the back of the screen. Then start it and check the screen flash color.


These come apart a little different than most. The front trim comes off with the screen. So essentially you are removing the back case first:
Once the four screws are out of the rear corners there are snap tabs that need to be released between the silver trim and the back black plastic (three top and bottom and two on left and right.)
You can use a thin knife blade to help release them as you separate the silver from the back plastic Black part has to be bent outwards to release these tabs.
Then entire guts will come out with the screen ., then the inverter is under the center area under the metal cover.
Shout if you need more info.
If you email me a good picture of the inverter in the area of the larger yellow square component and one from underneath , behind the two small yellow square components, I may be able to get a better idea if it is the inverter from a visual.

Email : bammbamm@ptd.net

Mar 29, 2010 | ViewSonic VX715 17" LCD Monitor

1 Answer

My Westinghouse 36 inch TV has picture and sound when I turn it on but when I change channels, the picture disappears and I have only sound. The picture comes back if you turn the TV off and back on but...


Hello, it sounds like your inverter board is goin out on the set, when you change channels if you notice on almost any TV the screen goes dark and the new channel appears, it sounds like you are not getting enough power out of the inverter board to power up the backlight enough to come on. This is why the sound remains because everything else works fine and the sound is connected to the main board.

Nov 22, 2009 | Westinghouse LTV-27w6 27 in. LCD HDTV

2 Answers

Dish menu but no picture or sound


Try holding the power button in on the receiver until the picture goes away then turn it aloose it will reboot and your sound will usually come back. If you had rather and can get to it unplugging it from the electric outlet, the receiver, does the same thing.

Oct 21, 2009 | Televison & Video

1 Answer

Change channel, lose picture. power off/on, picture appears


switched HDMI plug from HDMI1 to HDMI2 port and that solved the problem

Oct 11, 2009 | Polaroid Televison & Video

1 Answer

Picture will not stay in after 4 seconds of power...


check the auto darkness feature

it in the manual

Dec 05, 2007 | Televison & Video

1 Answer

Dark screen at top of TV picture


If this is a projection set then a center channel speaker sitting on top would have no effect.

Feb 03, 2007 | Toshiba 46H84 46" Rear Projection...

1 Answer

Channnel keeps flicking like your changing channels with remote


when you say flickering??? are you saying the screen goes black and comes back on?? does the sound go out at the same time and comes bag on with the pic ? Is the sound there when this happens but is distorted. Is the pic blacked out or is it greying out with lines and twisting?? Need more info please as if its blacking out and the sound goes with it it may be going into shutdown. If the pic is getting kinda greyish with it twisting and the sound is there and ditorted then the tuner could be bad

Mar 25, 2006 | Sony KV-32S26 32" TV

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