Atari 2600 Heavy Sixer recap issue

[shear_xear]

Hi, everyone.  I am getting strange interference on the screen when I power on two Atari VCS heavy sixer model consoles.  The system works fine until the switch board is touching (or gets near) the RF shield of the main board.  I have replaced the two 4.7 uf caps, the 2200 uf cap, the power regulator, and two of the chicklet caps.  The picture quality is excellent when the console is no assembled, but once the board gets near that shield the console gives a scrambled image (almost static) for every game but Frogger (and I think Carnival).  When the power switch is about eighty percent to the “on” position sometimes the console powers on with a mostly clear image.  Does anyone have a clue what could be causing this to happen?  Thanks!