Tip & How-To about Samsung LN46A650 46 in. LCD HDTV

Samsung 46" LCD Model LN46A650A1F has dark, slow developing picture from right to left across screen

Picture was dark, slow to develop across the screen from right to left; tapping, pushing or squeezing the upper left corner of the screen would sometimes restore normal brightness and picture. (Two separate problems)There was also a wide vertical band of lines on the right hand side of the screen and sometimes on the left.
The T-Con (Timing and Control board) located at the top middle of the back has (4) flat ribbon cables that can develop bad connections on the contacts. Some, usually only one or two will be the problem.

Gently remove the flat RF aluminum shield at the top frame edge to get at the ribbon cables. Pull down the small brown locking tab to free the cables. Then with slight pressure on the locking tab, gently move the ribbon cable up and down into the connector to restore proper connectivity. You may have to do this several times.
Note: your screen many have the band of lines at the far left, middle or mid left or mid right on the screen. As viewed from the front, the left ribbon cable will cause lines on the left of the screen and the far right ribbon cable will cause lines on the far right of the screen.
The above picture shows the left connector that was the cause of the band of lines on the right side of the screen in my TV.
Some message boards also recommend putting a thin piece of tape across the back of the connector, opposite the connection side to put more pressure on the conducting pins for better contact. It should be thin to avoid putting undo stress on the locking tab. If you break it you'll have to buy another T-Con board.

To fix the intermittent screen and lines on screen located in the upper left of screen, the aluminum frame surrounding the screen will have to be loosened, not removed. All of the small black screw at the top and sides will need to removed and some of the bottom ones to. The frame is flexible enough that complete removal is not necessary. Gently pull the frame away from the top of the screen - only a couple of inches is necessary. At the top left is a small ribbon cable that is the cause of the flashing lines and dark picture. I used a small, round .25"/6.5mm piece of foam and placed it across the edge of the ribbon cable while pushing the frame back into place. See picture where I placed mine to fix. Only use enough length approximately 2" placed over the ribbon cable, not shown, behind the frame as I'm holding in the pix.

These fixes apply to multiple models and screen sizes of flat screens. It should be noted, that if the band of lines on the screen remains stable no matter how much you move or try to clean the contacts on the T-Con ribbon cables then replacement of the T-Con board may be indicated. Good luck.

Posted by on

Samsung LN46A650 46 in. LCD HDTV Logo

Related Topics:

Related Questions:

1 Answer

My Palm Zire M150 touch screen is badly misaligned. How do I reset the alignment?

the screen says use stylus to tap center of target ...i do that and it goes to upper left corner i tap and it goes lower right corner and back and forth between the to corners?

Mar 01, 2011 | Palm Zire Mono M150 Handheld

1 Answer

i have a polaroid mp3 player 4GB PMP280C-4 i madea mistake and adjusted the brightness and noe the screen completely dark. how can i get it back to normal

Ok, I had this problem & finally fixed it! Hold the power button till the word "polaroid" come across the screen, wait a few seconds to make sure its on. Push the bottom right corner of the screen, push the middle of the left hand of the screen next, go down to about the middle of the screen and start pushing towards the right. If it doesnt work right off then keep trying cause it does work!

Jan 02, 2011 | Audio Players & Recorders

1 Answer

ds lite screens dark

I think there is a button on the bottom left of the bottom touchscreen where when you turn on the system even if there is no picture you should be able to tap it and change the screens brightness just by pressing this button. Its in the very bottom left corner

Nov 05, 2008 | Nintendo DS Console

1 Answer

arching color wave on bottom left corner & also on top left corner(color changes)

Convergence amps are failing which is very common. Several hundred dollars for a repair.

Dec 26, 2007 | Philips Magnavox 51MP392H Rear Projection...

Not finding what you are looking for?

1,142 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Samsung Televison & Video Experts

The Knight
The Knight

Level 3 Expert

76287 Answers

Jerry Greenberg
Jerry Greenberg

Level 3 Expert

1691 Answers


Level 3 Expert

13434 Answers

Are you a Samsung Televison and Video Expert? Answer questions, earn points and help others

Answer questions