Question about Samsung LNT4066F 40 in. LCD Television

1 Answer

I have a Samsung LNT4066F. Multicolor lines then normal.

I have a Samsung LNT4066F. Symptoms are as follows: when first turned on, it shows a very multicolored thin vertical lines on the entire screen. I turn it off and then try to turn on. It takes several attempts before it powers up. When it finally turns on, it shows normal but image is spotty. I turn off again and the screen is very clear as if its normal. Anyone know what causes this and possibly a fix. Thanks.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Samsung Master
  • 17,130 Answers

Had this problem occcured after opening of the set or by itself. If so please checck on the shielded connections of the power board. Please make sure your power outlet is working fine and there is full voltage on the input to the power the set carefully by unscrewing the rear panels. Look out for any loose/dry solder joints inthe power board.Use a good low wattage soldring iron to solder suspected joints.Keep the power off and be careful to see that you do not attempt to touch the main capacitors which could have high voltage stored. Next you need to check the drive to the panels, check from the transformers for loose / dry connections, if so resolder. once you have finished, close up the panel and test. If htis wont solve, test the voltages in the power and the drives, the fault appears to be some dry points so look carefully with patience. I hope this advice helps you out. Good day

Posted on Jul 07, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Blue line down the left side of Samsung ln52a530p1f

if it is a thick line, may be a main pcb. If it is thin, then it is a display.

Sep 28, 2013 | Samsung LNT4066F 40 in. LCD Television

1 Answer

Hi, I have a samsung LNT4066F (LCD 40 inch). Lately is taking a little longer than normal to turn on and sometimes its starts up with purple dots and lines spreaded all over the screen, but I know they are...

Write down your serial # (found on the back or on the side) and your model # and call 800-Samsung. The issue has to do with the capacitors and if your TV was manufactured between Dec 2007 and May 2008 they will send a repairman out to repair for free (one time only). I just called and they are sending someone out to repair mine. Apparently there are tons of people experience the same problem.

Aug 02, 2010 | Samsung LNT5265F 52 in. LCD HDTV

1 Answer

Colorful vertical lines on screen

more likely to be bad LCD panel (very expensive), but you can try replacing the LCD controller first (around $80~100).

Dec 01, 2009 | Samsung LNT4066F 40 in. LCD Television

2 Answers

Screen turns off

Please get the RAM checked for the system, as the multicolor lines normally appear when the RAM goes faulty and starts heating up faster than normal.

It also affects the RAM being able to pull the data from the system.

Sep 09, 2009 | Computers & Internet

Not finding what you are looking for?
Samsung LNT4066F 40 in. LCD Television Logo

245 people viewed this question

Ask a Question

Usually answered in minutes!

Top Samsung Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74383 Answers

Henry  Thomas
Henry Thomas

Level 3 Expert

1074 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

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

Answer questions

Manuals & User Guides