Thanks to the infos I received on this forum... Good guys...the problem is solved:
Indeed the ZENER ZDB803 must be a no less than 15 no more than 30 volts. the ref. on the diode is gone(from heat).
(although the schematic is not exactly the same)
The DATASHEET of the VIPer22A says: 9 to 38V for VDD of IC at Pin 4 (as you may see...)
The schematic (special thanks to tw2005) indicates 2 15V ZENERS 1N5245B in series, while in the TV I'm working on there is only one.(I think this could be annother factor of overheat!!).
MY solution:
I put 2 10V zeners in series and everything is OKKK. The TV became ALIVE again. With these 2 ZENERS in series: no more overheat & I got exactly 17.4 V on PIN 4 of VIPer22A. That should be OK. 5.1v for sdby is back again ...TV works perfectly.
Also RB830 is 1ohm 1/2 w not 2.2 as in the schematic.
Any other suggestions?
