Signal degradation across vertical section of
This appears to be a common complaint on LCD monitors. Some LCD screens have control issues.
An LCD screen is the panel and a bunch of Line control chips wrapped around the outer edge. A problem with one line top to bottom or left to right is almost ALWAYS the LCD panel itself.
A problem with a fixed band (The band is in the same place at any resolution) is often the LCD but might be the signal driver chip (A large plastic pack with about 100+ leads). A person with a VERY small soldering iron might be able to resolder it, but they MUST know what they are doing. (board must be heated, lead free solder, eye like an eagle...)
If the band moves around or changes width, it is the signal chip or the power supply to it from the power board.
It can be software if there is a firmware upgrade. This takes a shop.
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