Sony KV-36FS70 Service Menu Oops

[Zero1_]

To cut a long story short, I had bought this TV last week second hand from someone on ebay in good working order. Unfortunately it had many niggles such as discoloured corners, poor geometry, SVM and so on.

I had tweaked most things to my satisfaction, however there is what looks like a crappy deinterlacing filter which is making my video games look like crap wherever there is motion and also producing deinterlacing artifacts, so browsing the service menu to see if I could turn it off, I got a bit wreckless.

The last menu I recall being in was something like Mid-X or External PLL Mid-X. I changed a setting, but I'm pretty sure I pressed left and didn't save the change. Now I cannot get an image . I get an erratic image which looks like a black screen with the channel number int he top right, but I do get audio for whatever channel I'm on. It looks as though the screen is set at the wrong resolution or scan rate

Well this is so bad that I can't even see the service menu. What I need to know is, is there a hardware reset switch inside the unit, or another means of resetting the memory to defaults? I have a list of the factory calibration settings, but I need a reset method that doesn't involve the OSD. I have done the unplugging method already, and managed to enter 08 at the TT__ prompt which restored the user variable settings (not service menu settings).

Also which wire needs snipping to get rid of SVM, and is it dangerous?

Cheers