@marcelh18068 there is a lot of information in your QUestion. Which is good but it can get confusing. I suggest that you start by actually testing your logic board and let us know what you find.
Below are main logic board test points that you can use to verify proper power flow. All voltages assume that the display is plugged into a power outlet, and ***''NOT''*** into the host computer (unless otherwise noted).
• Turn the dial of your voltmeter/multimeter to measure DC (direct current) . If your voltmeter requires that you set a voltage range, choose a DC range that includes the voltage that you are measuring.
• Connect the black probe to ground by gently inserting into any of the LCD screw posts closest to the logic board.
Keep in mind that the threading in the screw posts is fragile and can be easily destroyed.
• Touch the red probe to appropriate test point.
• Verify voltages.
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