@zanrudolf you are not telling us how you headed up the "controller chip thingy" or even why you did that. What your video shows looks like a bad LCD and not a bad controller IC.
by doing this"If i press down on brightness wheel the screen becomes bluer" you are messing with the resistance of the potentiometer. the behavior that your screen shows is normal and there is no reason to apply pressure to the adjustment wheel.
You may have shortened out your IC and you should consider replacing that. Check your prior capacitor work and possibly reflow the ones you replaced.
Post some good pictures of both sides of the board so we can see what you see. [guide|21499]
Here is the service manual with the schematic, it should help you out to determine where the error is. [document|31617]
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A great resource for the 2-ASIC and the board view with schematics [https://oshwlab.com/maarten040476_3348/sega-game-gear-837-7996 |is here]
@zanrudolf you are not telling us how you headed up the "controller chip thingy" or even why you did that. What your video shows looks like a bad LCD and not a bad controller IC.
by doing this"If i press down on brightness wheel the screen becomes bluer" you are messing with the resistance of the potentiometer. the behavior that your screen shows is normal and there is no reason to apply pressure to the adjustment wheel.
You may have shortened out your IC and you should consider replacing that. Check your prior capacitor work and possibly reflow the ones you replaced.
Post some good pictures of both sides of the board so we can see what you see. [guide|21499]
Here is the service manual with the schematic, it should help you out to determine where the error is. [document|31617]