The "D" tells you its a high frequency NPN But the 2SD2539 and the 2SD1880 both cross to ECG2353 HOT w/Damper. I prefer the 2SD1880 over the Panasonic 2SD2539 it will hold up better Robert tvservice@xxxxxxxxxxxxx H & H Electronics Inc Dallas, TX ----- Original Message ----- From: "Phillip R. Hull" <phil245@xxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Tuesday, December 30, 2003 1:01 PM Subject: [TechAssist] Re: Panasonic TV CT-3269SCW Chas. AMEDP311 repeatedly blows regu... > If therre is a D in the number its supposed to have a damper > Phillip R Hull STET > phil245@xxxxxxxxxxxxx > FAX 517--569-3075 > Professional Technicians only > ----- Original Message ----- > From: <MDileo0000@xxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Tuesday, December 30, 2003 1:34 PM > Subject: [TechAssist] Re: Panasonic TV CT-3269SCW Chas. AMEDP311 repeatedly > blows regu... > > > > Gary, > > > > Info from a similar chassis ABP331. > > The 2SD2539 is a non damper transistor, the 2SD1880 has a built in damper. > > Your regulated B+ should be 130VDC. This B+ passes thru a fusistor pair > R808 > > and 809, 1 Ohm 1/2 watt. These pass B+ to/thru L803 and to pin 9 of the > FBT > > out pin 10 to the horiz out transistor. Horizontal driver Q501 is fed by a > > resistor pair R510, 511 3.6k 3wt. > > > > Let me know if this helps with your chassis layout. > > > > Dominic DiLeo > > Atlantic TV > > Freeport, Maine > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > In a message dated 12/30/03 11:13:08 AM Eastern Standard Time, > > gary@xxxxxxxxxxx writes: > > > > > I have received the new regulator IC and HOT from Panasonic. I replaced > > > a number of capacitors, D825 and it's filter cap, and I checked the > > > flyback out of circuit with my HR Diemen flyback tester and it shows a > > > good collector waveform and 30kv readout. I installed the new reg. but > > > decided to use a 2SD1880 to test the set with until I know it is ok to > > > install the (expensive) OEM HOT 2SD2539. I fired it up on 95V ac on the > > > variac. The set does not start up. I get 148V dc on cathode of D825 and > > > I get 31V dc on the B+ pin on the flyback. > > > > > > I don't have a schematic to trace the reason for the B+ voltage drop > > > between the source and the flyback. I am only assuming that the cathode > > > of D825 is the (130V?) B+ source for the flyback. Tried tracing it on > > > the circuit board but got lost. > > > > > > > > > Any help appreciated, especially a partial schematic for this this > > > chassis or similar chassis which includes > > > an STR58041A regulator. > > > > > > > > > > > > > > > Gary McCartney > > > > > > McCartney Electronics > > > Guelph Ontario Canada > > > Est. 1984 > > > email: gary (at) number63.ca > > > > > > > > > > > > > > > > > > > > > My original message: > > > > > > > > > I have worked on this Panasonic 32" TV model CT-3269SCW Chassis > AMEDP311 > > > about 4 times in the last year or so. One time the HOT and regulator > > > (STR58041A) were blown and I replaced with OEM Panasonic parts along > > > with a few supporting parts in the regulator circuit which I don't > > > remember at the moment. Another time the flyback was shorted. About a > > > month ago, the regulator was shorted so again I replaced with OEM part > > > and today the customer called and said he is bringing the set back in > > > first thing Monday morning, hoping to have it repaired for Christmas. > He > > > heard a POP and the set went dead. > > > > > > It seems there must be something I am missing when I'm replacing HOT's > > > and regulators on this set. Is there a service bulletin or a known list > > > of components which need attention while serving? I have soldered the > > > hor. driver transformer. I don't work on many Panasonics but the ones I > > > do usually are dogs. > > > > > > I am wanting to be able to order parts by noon on Monday so I can > > > hopfully get this set shipped before I close down for the holidays. > > > > > > Merry Christmas to everyone and thanks for any help. > > > -- > > > > > > **************************************************************************** > * > > 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/