Hall Sensor acting strange.

Hey everyone,

my MacBook Pro 13” (late 2013) has some “sleeping issues” (I better should say “backlight issues”). Sometimes the screens backlight shuts off while everything else still works. Using a flashlight I can see, that the screen still shows the image. Using a external monitor lets me control and use the MacBook like nothing ever happend. Later I figured out, that it has probably something to do with the hall sensor. So I opened  the MacBook removed the logic board and cleaned everything with a non conductive cleaner. After putting all back together I somehow found out that blowing at the area behind hall sensor leads to a black screen. Spraying it with the cleaner turns the backlight on again. Even if I close the backpanel and blow or spray through the USB port on the left side I get the same symptoms.

Here is a video showing the symptoms: https://streamable.com/9r4ie

I then thought it could be a cold solder joint. But my hot air station couldn’t solve the problem.

What do you think could be a possible reason why the MacBook misbehaves?

Would it maybe help to replace the hall sensor?