Just in case you can't get a schematic, or want to get ideas before you get the schematic I always check the internet.
http://videotech.lesterville.com/sony.htm
This place has a few items on sony flashing lights clicking etc. Just type in the model number you will get ideas on stuff to think about. I saw overcurrent stuff, Sony hold down circuites for the HV would also make the set turn on and off. Be sure to check out the section on the Self-Diagnostics incorporated into this tv.