Thanks. I wouldn't wish this one on any of you. You are all aware that I am at least vaguely familiar with Sony power supplies. See this response from another forum but I don't think he is talking about the same power supply as there are no mylar caps or fuse resistor in this one: Always replace Q601,602, both VDRs, all the diodes 4 in some, 8 in others, and the two mylar caps in series with the transformer primary, and the fuse resistor. Disconnect the HOT , and plug the set into a variac set to 30 v AC. With a scope, verify a 50 khz sine wave at the transformer primary. With a DC meter, measure the B+ at the fuse resistor. DC at Q602 (E or C memory fails) should be EXACTLY 1/2 the B+ Dc voltage. If it is not, other parts in the Q601,602 circuit, especially the transformer are bad. If it is exact, reconnect the HOT and try the set with series lamp. No shortcuts! Bob Waterman, CET® #RI-28 Master Technician License #9109 Service Manager / Parts Manager Gemini Computer, TV, & Security Alarms (508)695-7302 (508)695-7769 FAX geminitv@xxxxxxxxxxx geminitv@xxxxxxx www.geminicomputertvsecurityalarms.com ----- Original Message ----- From: "Jim Myers" <jr.myers@xxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Thursday, July 22, 2004 11:38 AM Subject: [TechAssist] Re: Sony KV32XBR96S (repeated audio amp IC failure) > A couple of tips mention Q605 on the G board, you probably should look > at that if you haven't already. Good luck on this one, sounds like a job > none of us would want to be stuck with. > **************************************************************************** *************************************** > Since 1972 > Jim Myers > Telrad Electronics > Fort Wayne, Indiana > > > Gemini Computer & TV wrote: > > Update! Besides the audio amp IC (IC1401) being blown again and replacing it > > along with D1409, D1410, D1411, and C1407, I have found the following > > defective components in the power supply and replaced them: > > > > Q603 > > Q604 > > VDR602 > > R623 > > > > After replacing these and every electrolytic on the "G" (power supply) > > board, when plugging in the set the relay starts to chatter repeatedly and > > Q603 and Q604 get very hot immediately and shortly thereafter short again > > (even with connector G5 disconneted for audio amp B+). this time however, > > R623 remains normal. I can't seem to locate why and I am spending far too > > much time on this set and the customer is very anxious to get it back. I had > > previously replaced C662 and C668 but as I indicated, all electrolytics have > > been replaced (again for some of them). Anyone have some sugestions? > > > > Bob Waterman, CET® #RI-28 > > Master Technician License #9109 > > Service Manager / Parts Manager > > Gemini Computer, TV, & Security Alarms > > (508)695-7302 > > (508)695-7769 FAX > > geminitv@xxxxxxxxxxx > > geminitv@xxxxxxx > > www.geminicomputertvsecurityalarms.com > > > > > > ----- Original Message ----- > > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx> > > To: "Techassist" <techassist@xxxxxxxxxxxxx> > > Sent: Monday, June 28, 2004 8:24 AM > > Subject: [TechAssist] Sony KV32XBR96S (repeated audio amp IC failure) > > > > > > > >>I have a customer (who is an electronics engineer) with a Sony KV32XBR96S > >>who brought in his set (as he lives outside my in-home service area) back > > > > in > > > >>January for a dead set condition. I had found the front audio amp IC > >>(IC1401) blown with a hole in it. There were also other damaged components > >>as well that were replaced with Sony originals. Here is a list of those > >>parts: > >>IC1401 > >>IC1501 > >>D1409 > >>D1410 > >>D1411 > >>C661 > >>C662 > >>C668 > >>VDR602 > >>R623 > >> > >>Everything was fine until the beginning of June when the customer once > > > > again > > > >>brought it in for a dead set condition again. This time I found and > > > > replaced > > > >>the following components with Sony originals: > >>IC1401 > >>D1409 > >>D1410 > >>D1411 > >> > >>I completed the repair on Friday, 06/18/2004 and let the set run > > > > continously > > > >>around the clock until he picked it up on Thursday, 06/24/2004. I had > >>informed the customer that IC1401 once again had a hole blown in it and > > > > had > > > >>him check the external speaker wire connections to make sure that none had > >>excessive length of exposed bare copper at either end when he returned > > > > home. > > > >>The set ran great Thursday, Friday, and part of Saturday but then the > >>customer states he lost audio for about 15 minutes, then lost the picture, > >>smelled burning, and the set returned to it's same old dead set condition. > > > > I > > > >>just got off the phone with him and explained that it sounds like that > >>IC1401 may have blown again but I am at a loss to explain the reason for a > >>repeated failure and that I would pose this question to my fellow > >>technicians on the various email forums to which I am a member. So now let > >>me request your collective ideas! > >> > >>Bob Waterman, CET® #RI-28 > >>Master Technician License #9109 > >>Service Manager / Parts Manager > >>Gemini Computer, TV, & Security Alarms > >>(508)695-7302 > >>(508)695-7769 FAX > >>geminitv@xxxxxxxxxxx > >>geminitv@xxxxxxx > >>www.geminicomputertvsecurityalarms.com > >> > >> > >> > >>-------------------------------------------------------------------------- > > > > --- > > > >>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?". 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