That type of waveform on a sw power supply normally indicates a short somewhere on the secondary side. Al G jhoeme@xxxxxxxxxxxxx wrote: > > This set came in with shorted HOT. To chk pwr supply used 40W light bulb as > dummy load, but puts out only about 12V and makes a growling sound. I have > replaced IC803, C820, C815, R822, T801, Q801, Q802, D823, R827 even tho they > all checked good. D825 checks good. Nothing is shorted on load side of PS. > Waveform at pin 4 of IC803 looks like > ||| ||| > ||| ||| > ||| ||| > ||||||||||||||||||||||||||||| > > and is only about 200V P-P > Anyone seen this before? > TIA > Jerry Hoeme > Jerry's TV Service > 840 S. Kansas Ave > Liberal, KS 67901 > jhoeme@xxxxxxxxxxxxx > ***************************************************************************** > CHECK OUT THE NEW CHATROOM! Just login and click on chat! > http://www.tech-assist.org/secure/tip/main.htm > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.htm > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.htm > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ ***************************************************************************** CHECK OUT THE NEW CHATROOM! Just login and click on chat! http://www.tech-assist.org/secure/tip/main.htm The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.htm Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.htm Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/