Sony KP-48S35 projection set October 1997

[zeno]

Sounds like HV leaking. As said look at it in a dark room.
They can leak at HV transformer, HV divider, anode connections,
& the focus pins & pots. Dont think its a yoke, that would
really mess up the pix.
Find that before worrying about the flashing. May be whats causing it.

73 Zeno