Picture reduced to 1/4 on a black screen

Samsung LN46B650 Thin Black Horizontal Lines - Forums - CNET

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CNETI'm experiencing thin black lines from the top of the screen to the bottom. ... by babes808gpa / January 15, 2010 1:42 AM PST ... lines are about 1/4 inch apart from top to bottom of screen. starts on the right and about a 1/3 of the way toward the ...have the exact same problem, my lcd tv has multiple lines are horizontal it ...

Faulty HD- LCD - LED TV - Horizontal Lines STRIPS on the ...

? 3:05
https://www.youtube.com/watch?v=KiqJuMiEiak
Jun 8, 2013 - Uploaded by Sameh Moustafa
Faulty HD- LCD - LED TV - Horizontal Lines STRIPS on the picture SOLVED .... I just have one black line ...

TV Repair Help for Vertical & Horizontal Lines on Your TV ...

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https://www.youtube.com/watch?v=b0sI7LB4cZE

Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---

Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.

Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.

There are some semiconductors or capacitors that are leaky. Might need thorough check up inside the TV.

Generally horizontal lines are caused by the panel failing, you can try a new tcon but I don't think it will help.

Call a good TV Tech and tell him the Convergence Amp IC's need to be replaced. Should not cost over $325.

Did you mean the picture is collapsed only in the middle horizontally(white line appears on the middle part of the screen)?
If that is the case, maybe vertical IC failed or loose connection.

the problem of your tv is in vertical section, to be sure change all the capacitor in vertical section.

Is this a LCD TV? IF it is it could be something on the video processing board. Let me know the model # and well will go from there. Thank you Jay

Bad solder connection in the horizontal pincussion circuit.have someone resolder.God luck.4tune

now only visible in a thin horizontal line. first of all you reduce brightness to monimum. it just to protect your tv from crt demage. your problem is in horizontal output section as you have mentioned that week or so ago the right and left bottom edges of the picture began to move in like a sideways triangle filled with black so this sympton is due to hor. section problem. your flyback transformer or horizontal output might be defective. but remember check for power supply is ok from surge protector hope this will help.