Possibly fixed. This set ended up having many bad connections in the power supply, especially on IC651. Even though they checked good, it was recommended to replace all 4 switching transistors as a group on these power supplies (Q601 - Q604). The final culprit was indeed IC651, The DM-44A power module, Sony part number 1-809-524-11 which is NLA but I found a brand new one I had in stock left over. The set is running but it now needs that test over time.
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 [EMAIL PROTECTED] [EMAIL PROTECTED] www.geminicomputertvsecurityalarms.com ----- Original Message ----- From: "Gemini Computer & TV" <[EMAIL PROTECTED]> To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> Sent: Thursday, July 22, 2004 10:19 AM Subject: Re: [Techs] Sony KV32XBR96S (repeated audio amp IC failure) > 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 > [EMAIL PROTECTED] > [EMAIL PROTECTED] > www.geminicomputertvsecurityalarms.com > > > ----- Original Message ----- > From: "Gemini Computer & TV" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, June 28, 2004 8:24 AM > Subject: [Techs] 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 > > [EMAIL PROTECTED] > > [EMAIL PROTECTED] > > www.geminicomputertvsecurityalarms.com > > > > > > > > _______________________________________________ > > Tech Repair CD...order your just $49.00 plus shipping...One year of > updates free. > > www.intrepid-video.com www.tech-repair.net > > Techs mailing list > > [EMAIL PROTECTED] > > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > > > > > > _______________________________________________ > Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. > www.intrepid-video.com www.tech-repair.net > Techs mailing list > [EMAIL PROTECTED] > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > _______________________________________________ Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. www.intrepid-video.com www.tech-repair.net Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com
