Television and Home Theater

I have a Sony rear projection TV model KP53HS10. Back in April I had this problem with the picture blinking intermittently. I posted the thread and received some beneficial help. I ended up getting ripped off for $160. for a service call buy a tech that was recommended by sony. He spent about 15 min, adjusted the G2 screen control. Well it's blinking again and I know the area it's in but not the exact adjustment screw (unless it's labeled). Can you help identify which adjustment screw it is? Is it possible that this fix will work twice?

I have a Mitsubishi VS 5007R and it continuously scrolls vertically is there a way to adjust the verticle or horizontal

Samsung HCN653WX I replaced the convergence board & I purchased a new S-Video Cord (as previously suggested) and plugged into to the back of the TV going to the cable box (then again going from the TV to the DVD) and still no color. When I originally pulled the TV out, the plugs were also pulled out, so I don't recall where the s-video cord was to begin with. Any other suggestions? The PIP is still showing full color but the big screen is in B&W.