Sound problem with Gameboy DMG Help

idarwin

Newb
I know this topic has been mentioned earlier, but I just can't get around this and I thought maybe someone could give me a hint.I have this DMG 001 gameboy, and I've installed the asm backlight. When I'm playing the display flickers. It also makes a lot of noise with the volume completly off (it's above normal, I know these things are noisy).What could it be? I'm not using rech batteries. Maybe a capacitor? I checked the electrolitycs and visually they seem okey.

I've removed the backlight and the problems go away. I tried a different backlight and I have the same issues.
I've followed best practices in order to connect the bl, avoiding the caps. I'm hooked directly to the power pcb. I'll attach some pics.

https://www.facebook.com/media/set/?set … 678b5d8484

I've read 3,44v with the current connection, and the backlight disconnected. Bateries are 1.39v each now (have some use). Is that the right voltage range for the connection point?

Any ideas?Thank you for your time
Some pics of the thing
 
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