[TechAssist] Re: Sony KV32XBR96S (repeated audio amp IC failure)
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 22 Jul 2004 10:38:18 -0500
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
>>
>>
>>
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