Thanks to Paul I have the manual for this now. Have checked and /or subbed all parts in primary side of PS. Opened all loads in secondary. Only thing showing not normal is waveform on pin 5 of STR, should be 3.2Vpp and is less than 1Vpp. STR runs hot and shuts off at 85- 90 deg C both with orignal and new STR either set on or stby. Cooled the STR with freeze and kept set on for about 10 min and the switching transformer gets real hot, about 80 deg C after 10 min. Possible bad transformer? If so will make too expensive to repair. Al G Al Gutz wrote: > Manuf 2002 > > Have a CT27G7DF with power supply problem. IC801 STRG5624 thermal > runaway and them shuts down, this happens either in stby or run. Picture > on set look A OK and an odd shot of freeze on STR it will work all day. > Replaced STR, checked all electros in PS and all resistors and diodes > out of circuit. In run B+ is 135V HOT and Vert run cool. > > Diode D812 is zener off pin 3 of STR, I measure a voltage of about 1.4V, > the diode is marked like a resistor and bands look like Green, Brown, Brown. > > Anyone see this problem before or any idea what voltage rating is for D812 > > Thanks for any info > > Al G > Al's TV-Electronics > Pembroke Ont. > Canada > > > ----------------------------------------------------------------------------- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > http://www.freelists.org/archives/techassist/ > ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: http://www.freelists.org/archives/techassist/