Sony Trinitron kv-27HFR blurry

The picture tube is gone.
i repaired 150 sony xbr and kv series with that problem.sony has a single gun not three and has a great pix,but burn out faster.
there is a main screen control that you can adjust ,but the tube is gone.
on the back of the crt there is 3 gun drives r g b .
turn the color all the way down so it is black and white.
if there is a green ore purple tint,one gun is out of balance.
ajdusting the r g b controls so that black and white is normal is what you want to do.
the crt board has the screen bias voltage 800volts on it so be very careful and use an insulated screwdriver to adjust the drive controls.

Ed might be wrong....

I have a kh-32fs13 Trinitron with the exact same issue, only looks good when dark, and even then it only looks good in the center.

I opened up the back cover and turned the focus knob on the flyback transformer clockwise a little bit and it fixed it! Full brightness with a chrystal clear picture!