Television and Home Theater

Hi, I am having a strange problem on this set. It comes on with the picture looking like the tubes are out of alignment and when it warms up, the picture looks closer to normal, except for the 6 inch band of lines running across the screen near the bottom and repeated about two thirds of the way up. I thought it seemed like a problem related to both convergence and vertical. I re-soldered a number of cold and cracked joints and thought I might be lucky, but no. I have a schematic. Any ideas would be greatly appreciated.

I can't seem to get the cannels to chnge. Only can only get 3 channels. the TV seems to be locked on those channel. Can anybody help me reprogram the tv to get all channels? 

Here is my problem, I have a 50 inch Panasonic DHD Plasma Television, Model TH-50PX60U and a cable box from my cable company for HD, Scientific Atlanta, Model 8300HD.  I just purchased a Panasonic DVD Home Theater Sound System, Model SC-PT750.  I have it wired up and can not get sound out of the Theater Sound System when watching a program on the TV.  I get the sound fine when running a DVD disk and watching it on the TV.  What might I