Psone screen noise on picture?

[supersonic_32]

Hi guys! I'm working on my second n64p and I face a problem I never had while making the first one... I plugged everything fine on the screen, everything works fine, except that when I decide to put some sound, if I put it over half of the maximum, picture has horizontal lines spawning that move on the beat of the sound, like if I can "see sound", understand?

I tried to resolder everything, change wires(I use floppy cables, even for the batteries) , isolate wires so it doesn't interferate... and yeah i though about the ground... Changed nothing... Does everyone know what the problem is?

 

[supersonic_32]

Nevermind guys, turned out my batteries weren't outputting enough voltage, so when speakers were loud, they were using too much power, so there was flicking on the screen!