GBA backlight mod help/question?

So I've been trying to do the gba backlight mod. I have a 40 pin gba so I bought a 40pin adapter. After connecting it all together and turning it on the screen is all washed out. After researching I found this thread.

http://gbatemp.net/threads/gba-backlight-agb-001.328487/page-36

According to the thread if you attach REVC to GND, it can fix the washed out screen. And it did fix it.

Next I run into my second problem. While the screen seems to work right, if it stays on the same screen for a while then moves you still see everything from the screen before ( like ghosting). It then slowly disappears.

Any help would be appreciated.

I've tried two 40 pin gba's I am starting to think it may be the Ribbon adapter.

Also sorry if this is incoherent and for formatting.

The screen I'm using is from a AGS-101. It does not have this problem when hooked into the sp.

 

I've had ghosting in all the ones I made.

It varies in seriousness with the 40 to 32 pin ones. Can't remember which gets better results. For my own 40 pins no extra cables were welded. I plugged ig and everything was fine. I need to solder more wires with 32 pins If I remember well or it wont light up.

I had one which was washed out once but doing what you did fixed it too.

As for ghosting I havent seen any solution and most people seemed to mention it too.

 

I believe the correct term is image retention. It's very similar to the IR on a plasma TV, although it disappears far quicker on the GBA.

I actually wanted to thank you OP, because I've had a modded GBA lying around for a while where the screen was too bright and washed out. The page you linked to helped med too (REVC to GND). The colors now look correct, but I too have the image retention problem, which doesn't look too good. I haven't read all the way through the thread yet, but I'm hoping there's a solution somewhere.
I PM'ed a guy on Shmups who did this mod, and he said he has zero IR on his, so it's probably a GBA/Cable/Screen mismatch :/

Mine is a 40 pin GBA too

 

I just finished my 40 pin backlight mod and I'm noticing image retention too. Haven't found anything new on Google yet but I'll report back if I find anything.

 

Anyone discovered a way to get rid of the image persistence yet?