You are lucky. This is not one of the Sonys from hell ! Actually they are
easy to fix.
Look behind the H output transistor. There was a disc cap ( IIRC 2200 @ 2kv)
that would short & burn. VERY common & also happened to
RCAs & Pannys.
If the HO itself shorted its usually cold joints at the H drive transformer.
Another common problem on most brands.
That will be some things to check.
73 Zeno
LFOD !