try turning the screen voltage down slightly On Wed, 6 Aug 2003 09:51:20 -0400, Joel Jacobs wrote > Hi techs, > This power supply shuts down every few seconds then restarts. The power > relay remains energized. I've changed the switching regulator IC, > the SE135, the opto, checked all the electrolytics in the power > supply and changed any that had even slight ESR. I've changed the > electrolytic in the horiz drive circuit that could cause ovecurrent > there. When it's running the picture looks fine. On the back there > is a sticker 'chassis BA-4D'. The BA-4D pdf in the files area has > inconsistencies in the power supply circuit and no voltages at all > so it's not a lot of help. I've run it on the variac from 90 to > about 135VAC with no change. I've tried unloading the supply > slightly by un-plugging the CRT socket board and it still cycles. > What is a good way to troubleshoot this circuit? How can I > determine whether it's the voltage feedback or current limit circuit > that's killing it? Anyone seen this before? Thanks much! Joel > Jacobs Ohio Consumer Electronics Pickerington, Ohio 614-833-9696 > > ***************************************************************************** > Classifieds! Buy or Sell! > http://sell.tech-assist.org > 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/ > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. -------------------------- James M. Knoble jmk1938@xxxxxxxxxx P: 304-366-1938 F: 304-367-8965 -------------------------- KnobleNet Webmail (http://www.knoble.org) -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ***************************************************************************** Classifieds! Buy or Sell! http://sell.tech-assist.org 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/