Sony Trinitron KV-24FS120 four blinks

[zeno]

Blink codes aside usually its over current shut down due to a bad FBT.
Wega sets had LOTS of bad FBT's. If you need to change one
you often need a special tool to get the HV lead out of the FBT.
IIRC the HVSD did not monitor the power supply directly. It watched
for over voltage or over current on the FBT. Most common SD was caused by
cold joints on the vert IC.
Service tip is to monitor the 200V supply to the CRT & see if it pulses.
Also with the DGS unplugged monitor the current draw of the set.
Normal running amps is apx 750 ma. If it pulses above apx 1 amp
its over current SD, FBT or other load on the FBT

BTW the 24" Wega was a hot seller. Perfect size for many. Always ran
out of them in a few weeks & had to wait for the next build to
fill orders.

73 Zeno
LFOD !