Hi everyone. In first place I want to thank everyone who discovered the method for modding the AGB-001 screen, and the people who posted their results so other people can learn about their mistakes and their success.
I also want to share my experience with these mods, in case anyone is interested, or maybe it is helpfull for someone.
The first time I tried to do this mod, I had a 40 pin board. I ordered the screen and the adapter on Aliexpress. It was a white tabbed one. The result as everyone knows now, was washed out colors. I tried shorting every combination of signals I read on this thread (RECV, GND, COM, P2-VEE...), but the best thing I get was right colors but TERRIBLE ghosting (the image was retained for even minutes). After a lot of tries, trying to fix it, connecting and desconnecting the screen, soldering points, etc. I ended up breaking the ribbon cable of the screen
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Reading that people had significantly more success with 32 pin motherboards, I found one on a local pawn shop. I ordered a second screen (white tabbed again), a 32 pin adapter, connected everything, tunned the potentiometer a bit, and voila, crystal clear image quality.
A few weeks ago I saw this post
https://gbatemp.net/threads/40-pin-gba-with-white-tab-lcd-perfect-solution.448597/ so I decided to order a third screen, and try again the 40 pin motherboard. I just have to say, to anyone having trouble with a 40 pin motherboard, that this method absolutely fixes all the problems (washed colors, ghosting...). The result is as good as the 32 pin motherboard. Just remove R16, R17 and C33 for isolating P2-VEE on the board, short REVC to P2-VEE to take the unmodified RECV signal to the LCD, and remove C54 and Q3 to take the potentiometer directly to the LCD. A bit of tunning on the pot, and the result is PERFECT.