CRT TV Troubleshooting

[+wongojack]

I have a nice big 27" CRT that has started to develop horizontal lines near the top 2 or 3 inches. As the TV stays turned on they 'retreat' back towards the top of the screen. At first they would disappear completely, but now about 1.5" area at the top of the screen remains with these horizontal lines. They distort the image a bit and against a black background they are not noticeable, but white or any other color and you can see them clearly.

 

I don't even really know how to begin troubleshooting something like this. I thought it might be RF interference, but I moved the TV to a different room of the house, and turned off all the electronic stuff near it and they are still there.

 

The TV is a Panasonic CT-27D20B TV

[+save2600]

Couple of thoughts:

High voltage power section starting to fail.

Horizontal pot and/or horizontal circuitry starting to fail.

 

 

[+wongojack]

@save2600 - Thanks for the response! Is there anything easy that I could check for if I opened her up?

[+save2600]

@save2600 - Thanks for the response! Is there anything easy that I could check for if I opened her up?

Nope, not really. Cold solder joints *maybe*. A lot of people might also try replacing all the electrolytic caps on the circuit board as something of a "shotgun" approach, but failing that... nothing "user serviceable" to be found inside besides a fuse and if that blew, you would receive no picture at all