Yes the buzz is coming from the main board. I haven't noticed the buzz before but it may be due to the fact that I didn't listened to noises . I think that I tried to press the metal cover of the T con and nothing happened. I would love to uncover that T con but the it's a bit tricky. there are 2 plastic screws with a Spring mechanism well I have a tendency to break things when I don't understand how they work so maybe I will save it for later
there is also a strange behavior: when I turn on the tv I see:
first I see only the left side which is really dim.
After 20 second a stripe appear on the right side
then the left side become bright almost perfect white!
and after that the right side become bright but more gray in color
there is a timing notion. I imagine it because of the blocked stripes on the cable
this is a 10 seconds video I made that describe 1 min of reality
I speed it up so it won't be boring to watch
https://youtu.be/6OuithZyBNgwould you say that the fact that I advanced from no image to very bright image is improvement? or am I at the same stating point?