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LCD Televisions are not like the old CRT Televisions of the past.
There is no individual controls to play with. They are totally digital computers inside. The image is stored in memory so it probably has a section of bad memory or the Graphics section is bad.
Other than checking for Bad Ribbon Connectors or bad leaky electrolytic capacitors there is not much you can do.
2 things that will cause that vertical IC or Yoke! Listen to this one went on service call 2wks ago Customer had a 50 INCH1988 pioneer big screen replaced 3 capacitors resolder poor connections TV is now working like New ?
The LG 44SZ21RB Have a problem with their light tunnel collasping due to the heat from the lamp. They are available as a spare part @ LG and would also require some silicon adhesive to bond it into the assembly. Very tedious job for any technican (2-3 hrs). Lg will not release parts to the general public only to an authorised LG agent.
replace the focus block or try to adjust the screen control on the focus block for red only. this will affect the white balance of the set so adjust it carefully. the focus block is located on the front inside the set. remove the speaker cover then the 4 screws on the front plate. the focus block is 3" x 2" black box with 6 adjustment posts three for focus and three for screen. adjust only the affected screen (R).
when you leave your TV (no matter what kind) and you leave it for long periods of time on a static image or something.. the image tends to burn in to the screen... so changing the glass would be a way to fix it.... the problem is that that kind of repairmen is more expensive and difficult than buying a new set...
THIS HAS NOTHING TO DO WITH CONVERGENCE or any of the stk integrated circuits.There are few capacitors close to the vertical output ic, they are usually blue or red (could be 1000uf 50volts for e.g.)That where the problem is