Megadrive/Genesis blocky graphics issue

Hi guys,

anyone know what could be causing this ? I'm getting these weird blocky graphics on my megadrive.
I initialy thought it could be the CXA1145P chip so I replaced it but the issue is still there, both with RGB or RF out and with any games I put in it
I wonder if this could be a ram issue but I just can't seem to find any replacement chip for these online

http://www.youtube.com/watch?v=9si2SdsgX2w
 
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