Can't control the SMPS. Put more than 25 volts A/C and it blows caps and burns resistors. At 25 v A/C, the voltage on the drain of the switching tranistor is about 150v. On the secondary side the H/O tranistor has 180v. The voltages per the print should be 180v on the drain of Sw.xstr. and 262v on the HOP col. Have replaced Q510 and Q511 switching transistors,IC502 feed back and Q507 feedback switching transistor. Have replaced open R514 .33 1w and R501 3.3 5w resistors. Checked litic caps,diodes and resistors. Replaced three litics in secondary that smoked. Any ideas? Paul Paul ,B Central TV&Video 911W Grand Ave Grover Beach Ca. (805)481-8084 ----------------------------------------------------------------------------- This Email List is Public. Remove: http://www.tech-assist.org/remove.htm Lost Password: http://www.tech-assist.org and select "Login Problems?". Appliance Repair List: http://www.tech-assist.org/secure/tip/chatjoin.htm#app Email Archives: //www.freelists.org/archives/techassist/