Okay, I'm new here so I hope I'm posting in the right place and I'm not quite sure if I used the appropriate terminology in the title, but here goes. Basically I have this old Sony WEGA Trinitron TV and it had always had really bad overscan and recently I've learned a lot and I actually went into the service menu and modified it enough so the entire picture shows up and is aligned properly. And boy was that ever a huge pain because messing with things like VPOS and VSIZ wasn't enough and so I had to find the settings by basically trial and error and now I've got as close to a perfect screen as I will ever get.
BUT I still have a few issues. One is that I still have overscan on 1080i. I tried modifying some other settings to try and fix it, but close to the bottom becomes distorted\curvy. Plus this isn't really my major concern because if I were to use it with my computer for instance, DirectX 10+ games don't seem to work with 1080i.
I'd be perfectly happy with 720p except for the fact that you can visibly see the flicker of the TV. As in say I have a white line going across the screen on an image, it doesn't seem like it's perfectly still, it's like when you pluck a string or rubber band. However this only visible on 720p. I don't notice it on 1080i and it's definitely not there on 480p. I haven't been able to find the settings in service mode to adjust this, although I did come across this setting MVLY under MID5 which if I set from 0 to 1, it fixes the flicker issue, except that it screws up the screen a bit and you can see it kind of shifting horizontally.
Any help is greatly appreciated, thank you!
Edit: I seemed to have found a solution to the flickering, but even if I write the change to the EEPROM, it keeps resetting back. I've found in the service menu this thing called HMSK under CXA2171 and is by default set to 1, but set to 0 my screen looks better, but it will not save. Any ideas?