Simple ring the flyback to find out if it is bad.
Check the horizontal driver transformer solder connections, could also
short HOT.
Tuner ground problems or corrupted eeprom due to same can also blow
HOT.
Arcing back crt could also cause failure.
Failure in the smps main b+ diode can blow the HOT.

Lots of different possibilities, start doing the basic troubleshooting
for that type of failure, then continue troubleshooting once unit can
be powered up with the main b+ current limited.

David