Question about Samsung Televison & Video

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My samsung tv model UN29F4000, has sound but no picture, no menus come up. I'm not sure if it has a tconn board or not. What is the most common problem with a tv with these symptoms

Has sound but no picture, no menus nothing on the screen at all screen is black.

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  • Samsung Expert
  • 261 Answers

The most of this TV problem is that the inverter transformer built on the main power supply is bad, to fix it, you may replace the transformer , or replace the power supply module.

Posted on Apr 06, 2015

Testimonial: "Hi, I replaced the power supply module and still sound but I did notice a very faint image on the screen in the dark can't make it out but something is there but any light shining on the screen and you won't notice it. Any other suggestions for this problem"

  • City View TV & Computer, Inc.

    Please check out the backlights on & dim control voltage on the connector from the main board to the power supply board. When the TV is powered up, the back lights on voltage should be 3.2V to 4.5V, the dim control voltage should be 2.8V to 3.5V; if you missed any of this two voltage, you do have a defective main board; if the voltage is there, but the backlights is not turned on, you may still have a defective power supply, or the backlights assy is bad.

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SOURCE: HALF PICTURE ON LG PLASMA MODEL 42V7

first check all of your ribbon cables. then check the lvds cable. if this dont fix then you will have to get a service manual and run the panel by itself to determin wich circuit your problem is in. any questions feel fre to contact me....

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You need to do some more diagnosing of the problem. If you get sound and change channels take a bright flashlight and place it again the screen. Look for an image around the edge of the flashlight.
If you see an image that means the LCD controller board (TCON) is probably good.

The problem is probably one of three causes;
1) Inverter board is bad
2) CCFT (cold cathode fluorescent light) are bad.
3) Power to the inverter board is bad. You can also check the connectors.

Posted on Mar 30, 2009

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Sounds like main board failure and or power board failure. You need to contact manufacturer and describe problem for tech support. Some of the parts in Samsung TVs have lifetime warranties. Change out of two board is about an hour job and service call is usually comped. Hope this helps. J

Posted on Apr 09, 2009

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My set has encountered this magical 50/50 split screen and it seems to be quite a problem since I am not the only one researching this issue. LG was of no use because of course it is just out of warranty. Any solutions on fixing this or am I out of money in buying a new plasma?

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buffer board needs replaced need to replace both

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