Question about Panasonic CT-20G14 20" TV

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TV Screen problem

Hello, My TV is about 5 years old and a few days ago the screen started to reduce size; wide black bands appearing at the top and bottom, and the picture becoming narrow across the center. When we called the Panasonic 1800 number and talked to trouble shooting over the phone they had us reset the TV. Upon doing so, the TV shows that it has a code TN-4. How can we fix this? How much will it cost? Is it worth fixing, or would we be better off investing in a new TV? Thanks

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SOURCE: panasonic tv has white lines at top of screen

suspect it's 1 or a couple of bad capacitors in the vertical deflection circuit the caps are in the 400 series, c400,c401,c402, etc... check or replace c414,c418 & c417

Posted on Oct 31, 2006


Maybe the vertical IC output are damaged you need to replace him

Posted on Sep 19, 2008

  • 1 Answer

SOURCE: Panasonic 32 inch TV has horizontal lines across screen


Posted on Feb 05, 2009

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SOURCE: Remote sensor does not work on my 27

test your remote first by placeing in front of a cell phone camera and press any button on the remote and look for a blinking light on the cell phones lcd screen (same as taking a picture) if you the blinking light then your infrared remote sensor is bad inside the tv. part cost about 10 dollars.

Posted on Mar 19, 2010

  • 1 Answer

SOURCE: Horizontal white lines across top of TV screen

Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.

Posted on May 23, 2010

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SOURCE: Panasonic TV CT-32631U 36

Dry joints on frame output ic

Posted on Dec 11, 2011

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Disney princess tv suddenly narrowed the visible part of the screen. Now everything is squished into a two in wide band with all the rest of the screen is black.

if that 2 band according to you from top to bottom,it has a defective vertical stage.if this two band appears one on top and one at the bottom,it`s on vertical stage.leaky capacitors,resistance changed or resistor devalued ang ic`s, are too weak to amplify a signal to make the screen complete....

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How do I change it from wide screen to regular? I have a black area above and below the picture.

You can set the picture size by remote control itself.

You can vide 480i format programmes in three picture sizes. 4:3, 16:9, and ZOOM
You can change the picture size by pressing the PICTURE SIZE button on the remote control.
4:3 Picutre size
To fill the screen, the top and bottom edges are extedted more widely, although the center of the picture remains near the former ratio.
If receiving a 4:3 programme, the image size is displayed in its originally formatted proportion.
16:9 picure size
This image displays the size of standard 16:9 with black bars at the top and bottom.
If receiving a 4:3 programme, the image is displayed with black bars at the top and bottom and stretched wider.

NOTE: If a fixed bar remains on the screen for a long period of time, the image can become parmanantly engrained in the screen and cause subtle but permanent ghost images. Never leave your TV for long periods of time while it is displaying these images.

Zoom picture size [for 16:9 formats]
The entire picture is uniformly enlarged --it is stretched the same amount both wider and taller (retains its original proportion). The right and left edges of the picture may be hidden.

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1 Answer

Same white lines on top of screen

you still go the warrenty on it

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1 Answer

Wide black area top of the screen.

More than likely it's not the crt. If the picture has "foldover" at the top of where the picture is currently, then more than likely there are bad caps. in the vertical scan circuit. If not, the vertical sizing probably just needs to be adjusted. You will have to get in to the service menu to do that.

May 26, 2008 | Philips Magnavox 27MT5405 TV

1 Answer


The vertical circuit is not pulling the top of the picture to the top of the screen (CRT) correctly. Its possible you have a loose wire or device ( after moving ) . If you have vertical agustments on the back , you may be able to adjust the picture taller; if the picture becomes stretched ( non - linear ) then you definately have tv tech only problems. At that point I'd really think twice about a repair and consider a new DTV or HDTV set. If the unit was damaged by a mover , then you may have a claim against them .

Apr 30, 2008 | JVC AV-27D305 27" TV

1 Answer

Philips 28PW6515-05 flat screen TV

You have a bad connection on the CRT board thats mounted on the end of the picture tube it sounds like, or the socket on that board that plugs into the TV set is intermittant or has a bad solder connection on it. Good Luck

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You probably have a component breaking down on one of the circuit boards. It would have to be checked out to find out which one. Stargazer

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