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Probable cause of 2 vertical bars each 160px wide?

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    Probable cause of 2 vertical bars each 160px wide?

    This is the Iiyama Prolite X2474HS, a 24" display with fullHD. It turns on and the backlight looks okay, but then there are 2 vertical bars each 160px wide.
    This affects the on screen menu as well as when a source signal is present (independend from the port used).

    I inspected the logic board under the microscop but did not find anything suspicious. Solder joints flat cables at the panel, connectors look fine, and show no response to pressure. There is one big chip with 128 pins (TSUMOP88CT9-1) I could not find a datasheet or any other information for. I assume this chip does the multiplexing.

    While the boot screen can display a bright white it seems the bar on the right later lacks blue color entirely. What does this point to in your opinion? What has worked for you in the past?
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