[TechAssist] Re: Sony KV32XBR55 dead set
- From: "Larry E." <videotech@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 14 Nov 2002 15:00:48 -0500
Leonard, thanks for the reply, replaced Q604, C651, C613, now pin 1
of IC651 reads 168 volts regardless if plug F61 is in or out of circuit.
Pin 9 of IC651 reads zero volts even after replacing Q604, I read a
short (11 Ohms) on Diode D652, pulled diode and it checks good, short is
on traces, the print I`m using is useless in this area, is this a
problem or am I chasing my tail? Thanks for any help you can give, Larry
Larry Eastman
American TV & Electronics
Crystal River, Fl.
Leonard G. Caillouet wrote:
> Larry,
>
> I had one do this a while back. The fix was to replace Q604 2sc3311A (soft
> start driver) at pins 8 & 9 of IC651.
>
> Also, always ESR the electrolytics in the circuit and look for leaks,
> especially C651 2.2uF 160V and C613 100uF 25V.
>
> The two SE135 error amps are always suspect as well.
>
> I did the same as you, looked to the A board until a tech at sony told me to
> just change Q604, even if it checks good.
>
> Leonard G. Caillouet
> Service Manager
> Electronics World
> Gainesville, FL
> 352-332-5608
> 352-332-5668 (fax)
>
> ----- Original Message -----
> From: "Larry E." <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, November 13, 2002 1:45 PM
> Subject: [TechAssist] Sony KV32XBR55 dead set
>
>
>
>>Hi guys, Sony KV32XBR55 came in dead, replaced IC651, C652,C672,C654
>>and C674 as advised, now have 5v & 12v standby but voltage on reg. IC
>>pin 1 is only 86 volts, If I remove connector/plug F61/A61 pin 1`s
>>voltage goes up to 160 volts so obviously there is a heavy load
>>somewhere on the "A" board. I`m using a "similiar" schematic and it`s
>>close on the F board but not so good on the A board and the schematic
>>for this set is NLA. HOT is not shorted, all low ohm resistors on A
>>board are good, any ideas? tia, Larry E.
>>--
>>Larry Eastman
>>American TV & Electronics
>>Crystal River, Fl.
>>http://www.tvjunkyard.com
>>
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--
Larry Eastman
American TV & Electronics
Crystal River, Fl.
http://www.tvjunkyard.com
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