Thanks Jerry. I had no problem changing the IC's, I think the heat is coming from the -5V regulator. But it might be normal, or are you saying that both IC's on the 9-1960 board should run the same? The insulator on the heat sink is still intact. the -5V regulator is regulating at 5.1V. Maybe I should change that. Al Marquardt ampm@xxxxxxx Al Marquardt Electronic Repair 206 W Main Girardville Pa. 17935 ----- Original Message ----- From: "Gerald Gann" <alpha21century@xxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Monday, January 24, 2005 11:14 PM Subject: [TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE. update > Al: Just got back from a long weekend and got around to checking > email. I had this happen one time. Tech changed the STK's on convergences > board. One was dried on so hard on the heat sink he had to us a small > screwdriver and chisel it off the heat sink. In doing so he scared the > heat sink and left a burr and he did not notice it happened. This keep the > STK from making good contact the head sink. This caused the STK and heat > sink to heat up. This was a recall STK did fail after a few days. After > removing the STK and wipeing off the heat sink compound we found the burr. > Took a flat file and filed off the burr. New STK and compound, let play > for an hour or so. Checked temperatures both IC's the same. No more > recalls. I don't know if this will help or not but stranger things do > happen. > Jerry > > Alpha 21 Electronics > > Granite City, IL 62040 > > Ph. 618-452-8620 > www.alpha21century@xxxxxxxxxxxxx > > al m <ampm@xxxxxxx> wrote: > If someone gets a 9-1690 convergence board in, could you please let me > know > if the blue convergence heatsink should be running hotter than the red > one. > Mine is running at 138f deg.. > Al Marquardt > ampm@xxxxxxx > Al Marquardt Electronic Repair > 206 W Main > Girardville Pa. 17935 > ----- Original Message ----- > From: "al m" > To: > Sent: Wednesday, January 19, 2005 4:18 PM > Subject: [TechAssist] Re: Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE. > update > > >> >> This set the blue convergence was replaced with a STK392-180. The picture >> is >> good but the heat sink that the IC is on is measuring 139Fdeg. The red >> heat >> sink is a lot cooler. I have changed all caps on the board and checked >> all >> the other components. There is a -5V regulator on this heat sink. The >> voltages are all correct on the board. Could this heatsink be running >> hotter >> than the other one because of the -5V regulator? Could this be normal? >> All >> the heat seems to come from the -5V regulator. When I measure the temp on >> the IC it is cool but on the regulator it is 138F. Am I chasing a ghost >> again with this being normal? Thanks. >> Al Marquardt >> ampm@xxxxxxx >> Al Marquardt Electronic Repair >> 206 W Main >> Girardville Pa. 17935 >> ----- Original Message ----- >> From: "al m" >> To: "tech assist" >> Sent: Saturday, January 08, 2005 11:44 AM >> Subject: [TechAssist] Zenith Z52Z95D8 9-1674 SWEEP 9-1690 CONVERGENCE. >> >> >>> This set had no power. I replaced the B+ diode and the set ran but the >>> blue >>> convergence was off. Changed the blue convergence IC ( STK392-110 with >>> STK392-180). The Ic's are running hot. How hot are these supposed to >>> run. >>> I >>> can keep my finger on it but it is hot. I may have something more wrong >>> with >>> the power supply. >>> Al Marquardt >>> ampm@xxxxxxx >>> Al Marquardt Electronic Repair >>> 206 W Main >>> Girardville Pa. 17935 >>> >>> >>> >>> ----------------------------------------------------------------------------- >>> Lost Password: >>> http://www.tech-assist.org and select "Login Problems?". >>> Email Archives: >>> //www.freelists.org/archives/techassist/ >>> >>> >> >> >> >> ----------------------------------------------------------------------------- >> Lost Password: >> http://www.tech-assist.org and select "Login Problems?". >> Email Archives: >> //www.freelists.org/archives/techassist/ >> >> > > > > ----------------------------------------------------------------------------- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > > > > ----------------------------------------------------------------------------- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/