Lift the diode, its gotta have numbers on it. You need a fast
switching diode like the old ECG552. Got to use the right thing.
Sony often used small coils for a fuse / inductor.
Its probably the 200 V supply for the 3 drivers. Usually goes like this:
FBT winding to coil or low ohm resistor ( fuse) to anode of diode.
Catode to cap to GND typ 5 or 10mfd.
That goes to the CRT for the driver collectors. Thats it.
Sometimes the cap dont go tp GND but to the 120V main supply.
The symptoms are like 200V fail. You can get any of the following:
Brite with retrace then HVSD, shading, bleeding, jailbars, bad CRT look.
It a common problem in 99% of color TV's, all brands. It put many
cases of beer in the fridge
73 Zeno
LFOD !