[TechAssist] Re: Sony KV-8AD10, Dead
- From: Bruce Youmans <youmans@xxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 6 Nov 2004 16:36:41 -0700
Ken,
No schematic. I suspect T602 SRT. I think SRT stands for
switching regulator transformer. The transformer has a primary and two
secondary windings. One of the secondary windings rings low.
This is the winding that ties in with Q601
Bruce
Bruce's TV Service
Sierra Vista, Arizona
>Bruce,
>
>You don't say what T602 is. No matter. I did a power search in Winstips
>for T602 for ANY Sony. There is not a tip for T602 being a problem.
>
>
>Ken Smith
>Gulf Technical Services
>3034 Gulf Breeze Parkway
>Gulf Breeze, FL 32563
>850-934-8324 (Voice), 850-932-0819 (fax)
>
>On Sat, 6 Nov 2004 12:27:08 -0700 Bruce Youmans <youmans@xxxxxxxx>
>writes:
>> Ken,
>>
>> I have replaced C615 already with no success. I originally thought
>> it
>> was the problem as it had a bad ESR. I haven't tried the diodes yet,
>>
>> although they seem to check OK. I will try and sub them. The only
>> problem is I will probably short another Q601 if the diodes do not
>> help.
>>
>> I still suspect T602. Do you know if this has been a problem
>> transformer?
>>
>> Thanks.
>>
>> Bruce
>> Bruce's TV Service
>> Sierra Vista, Arizona
>>
>>
>>
>>
>>
>> >Bruce,
>> >
>> >Check/replace C615 (22@16), D607 (1S1585), and D608 (1SS119).
>> >
>> >
>> >Ken Smith
>> >Gulf Technical Services
>> >3034 Gulf Breeze Parkway
>> >Gulf Breeze, FL 32563
>> >850-934-8324 (Voice), 850-932-0819 (fax)
>> >
>> >On Sat, 6 Nov 2004 11:06:02 -0700 Bruce Youmans <youmans@xxxxxxxx>
>> >writes:
>> >> Manufacturer: Sony
>> >> Model: 8AD10
>> >> Chassis: SCC-B79A-A
>> >> Sympton: Dead
>> >>
>> >> Found the following parts bad:
>> >>
>> >> F604, 2.5A fuse - open
>> >> Q601, 2SC4274 transistor shorted
>> >> C615, 22ufd@16v capacitor leaky
>> >> R602, 2.2 ohm resistor open
>> >>
>> >> All else seems to check fine.
>> >>
>> >> Replace all and Q601 shorted immediately, even at half AC line
>> >> voltage and with a 40 watt bulb in series with AC.
>> >>
> > >> No schematic. I suspect T602 SRT. I think SRT stands for
>> switching
>> >> regulator transformer. The transformer has a primary and two
>> >> secondary windings. One of the secondary windings rings low.
>> This is
>> >>
> > >> the winding that ties in with Q601.
>> >>
>> >> Any thoughts? or other parts I should check?
>> >>
>> >> Thanks.
>> >>
>> >> Bruce
>> >> Bruce's TV Service
>> >> Sierra Vista, Arizona
>> >>
>> >>
>>
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