Would need any suggestions for fix this display issue with Sony TV

I have a sony trinitron (mod # kv27hsr10).. Almost from 1 yr we have been using this TV with home theater connected to it. The problem is screen goes blank when we switch off the TV before we switch off the home theater system. And from it stops to display the screen.. it just goes blank... however it automatically works in next 2/3 days.. during this time there is no issue with the audio only video goes blank. Couple of days back we watched a movie (dvd) and switched the off the TV before the home theater.. thats it from then it stopped the video.. its been four days that it has stopped the video. We have searched in the net and found some solutions like to turn on the black screws on the G2 board... we could not find G2 board.. but found one black screw at the bottom of the red lead that comes frm picture tube... we have adjusted by turning it slightly and completely.. we swicthed on and off but no luck.. btw.. the below the black screw..its been labled as Dynamic Focus... Could someone please help us to fix this. Thanks a ton.

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