I remember that there were electrolytic coupling caps to the horizontal=20 driver circuit that would cause the horizontal freq to run away and cause th= e=20 output to fry and that would knock out the primary regulated supply. Dominic DiLeo Atlantic TV Freeport, Maine ___________________________________________________________________ Things slowed down a bit around the shop so I decided to take another peek inside this oldie. Here's what I know...disconnected +B from Q902 (horizontal SCR), loaded +B down with a 60W bulb, switched TV "on" and fuse F650 remains intact. Disconnect 60W bulb load, reconnect +B to Q902 and fuse pops. Q902 is not a horizontal output transistor but a horizontal output SCR, interesting. No shorts from gate to anode or cathode, etc. Previously replaced shorted D806 (damper diode), recently replaced Q650 (crow-bar SCR) and C850. What else should I be looking for? What did I miss? Thanks. David Lessard Alexandria Electronics Ontario-Canada mrfixit@xxxxxxxxxxx -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of David Sent: Friday, May 09, 2003 7:47 PM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: Sony TV KV-1920 - Dead - Followup - 2nd Request Not sure exactly what I need. The problem is this, D806 shorted, fuse F650 opened. Replaced D806 and F650, TV stayed on for 20 seconds before F650 opened, D806 remained intact. Also, found C807 changed in value from 330uf to 380uf. I'm looking for circuitry reference to those components. I thank you kindly sir! David Lessard Alexandria Electronics Ontario-Canada mrfixit@xxxxxxxxxxx -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of D Thunhurst Sent: Friday, May 09, 2003 5:59 PM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: Sony TV KV-1920 - Dead - Followup - 2nd Request David, Sams shows 1455, 1627, and 1708 for that model. I have all of those numbers. Which one and which section do you need. I can run a scan on the portion you need. Daryl Daryl's TV 3310 Dyer St. El Paso, TX 79930 915-565-9184 915-564-1024 Fax dthunhurst@xxxxxxx http://dynacomp.freeyellow.com -----Original Message----- From: David <mrfixit@xxxxxxxxxxx> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx> Date: Friday, May 09, 2003 10:10 AM Subject: [TechAssist] Re: Sony TV KV-1920 - Dead - Followup - 2nd Request > >Do any of our members have a service manual or partial schematic on this >model please!? > >David Lessard >Alexandria Electronics >Ontario-Canada >mrfixit@xxxxxxxxxxx > >-----Original Message----- >From: techassist-bounce@xxxxxxxxxxxxx >[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of David >Sent: Thursday, May 08, 2003 2:01 PM >To: techassist@xxxxxxxxxxxxx >Subject: [TechAssist] Re: Sony TV KV-1920 - Dead - Followup > > > >Replaced shorted D806 with ECG552. Replaced fuse F650 (2.5A), this fuse is >on a small board with an SCR (Q650), not sure but I think it's part of the >regulator circuit. TV fired-up for about 20 seconds then died. F650 opened >again, D806 still intact. Note: C807 which should be 330uf reads 380uf, not >sure of its function or if this could be causing F605 to open. A service >manual sure would come in handy here. Any input would greatly be appreciate. > >David Lessard >Alexandria Electronics >Ontario-Canada >mrfixit@xxxxxxxxxxx > >-----Original Message----- >From: techassist-bounce@xxxxxxxxxxxxx >[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of David >Sent: Thursday, May 08, 2003 12:57 PM >To: techassist@xxxxxxxxxxxxx >Subject: [TechAssist] Re: Sony TV KV-1920 - Dead > > > >No problem Bob, it's just that the ECG552 is only a 600V diode and the >ECG551 is a 1500V diode. I wasn't sure if the ECG552 would work too. Again >thanks, I'll try it and let you know how I make out. This sure is an old TV >(1978). > >David Lessard >Alexandria Electronics >Ontario-Canada >mrfixit@xxxxxxxxxxx > >-----Original Message----- >From: techassist-bounce@xxxxxxxxxxxxx >[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Gemini Computer & >TV >Sent: Thursday, May 08, 2003 12:33 PM >To: techassist@xxxxxxxxxxxxx >Subject: [TechAssist] Re: Sony TV KV-1920 - Dead > > > >>From the NTE cross reference program, the new part# 8-719-312-71 crosses to >an NTE552 as follows: > >Industry Number : 8-719-312-71 >NTE Device Number: NTE552 >RECTIFIER-SI,600 PRV,1A,DO-41 > >The RS3FS number does as well: > >Industry Number : RS3FS >NTE Device Number: NTE552 >RECTIFIER-SI,600 PRV,1A,DO-41 > >Bob Waterman, CET=AE #RI-28 >Master Technician License #9109 >Service Manager / Parts Manager >Gemini Computer, TV, & Security Alarms >(508)695-7302 >(508)695-7769 FAX >geminitv@xxxxxxxxxxxxxxxx >geminitv@xxxxxxx >www.geminicomputertvsecurityalarms.com > > >----- Original Message ----- >From: "David" <mrfixit@xxxxxxxxxxx> >To: <techassist@xxxxxxxxxxxxx> >Sent: Thursday, May 08, 2003 12:13 PM >Subject: [TechAssist] Re: Sony TV KV-1920 - Dead > > >> >> Bob, Is there an ECG equivalent? Do you think the ECG506 would be a >suitable >> replacement. Thanks for your opinion. >> >> David Lessard >> Alexandria Electronics >> Ontario-Canada >> mrfixit@xxxxxxxxxxx >> >> -----Original Message----- >> From: techassist-bounce@xxxxxxxxxxxxx >> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Gemini Computer & >> TV >> Sent: Thursday, May 08, 2003 11:58 AM >> To: techassist@xxxxxxxxxxxxx >> Subject: [TechAssist] Re: Sony TV KV-1920 - Dead >> >> >> >> The original part (SID30-15) was Sony part# 8-719-900-15. It is now >replaced >> by an RS3FS, Sony part# 8-719-312-71 which is in stock at Tritronincs for >> $5.20 if this helps you. >> >> Bob Waterman, CET=AE #RI-28 >> Master Technician License #9109 >> Service Manager / Parts Manager >> Gemini Computer, TV, & Security Alarms >> (508)695-7302 >> (508)695-7769 FAX >> geminitv@xxxxxxxxxxxxxxxx >> geminitv@xxxxxxx >> www.geminicomputertvsecurityalarms.com >> >> ----- Original Message ----- >> From: "David" <mrfixit@xxxxxxxxxxx> >> To: <techassist@xxxxxxxxxxxxx> >> Sent: Thursday, May 08, 2003 11:21 AM >> Subject: [TechAssist] Sony TV KV-1920 - Dead >> >> >> > >> > Found D806 shorted (SID30-15). Crosses to ECG551 (discontinued). Does >> anyone >> > know what I could sub this part with? >> > >> > Thanks in advance. >> > >> > David Lessard >> > Alexandria Electronics >> > Ontario-Canada >> > mrfixit@xxxxxxxxxxx >> > ***************************************************************************** The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.html Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.html Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/