[TechAssist] Re: Sony KV-32S25 dead, G-board Q601,Q602, HOT shorted. shorts again

  • From: Carol Rundle <brundle@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Mon, 27 Jun 2005 22:14:43 -0700 (PDT)

    Check c609 ,610,611,612,film caps.( they can be a real  pain in the)... 
Also check   vdr601,d648 150v zener. Might be a bad horiz. Dr. xformer !
 
   Bill
   Sonora,Calif.
"Bob@bobsTV" <woodman17@xxxxxxxxxxx> wrote:
Phil,
Had a Sony and found a .47 cap at drive transformer cause your exact
symptom..
Bob.

Bob's TV Worcester, ma

woodman17@xxxxxxxxxxx



----- Original Message ----- 
From: "Phil Bader" 
To: 
Sent: Monday, June 27, 2005 4:44 PM
Subject: [TechAssist] Re: Sony KV-32S25 dead, G-board Q601,Q602, HOT
shorted. shorts again


> Note on the 2sc4834's.
> The originals were a suffix "N".
> Glen at ACME assured me he sells the "P" suffix (2sc4834P) and are a
> much heavier duty transistor than the orig. They sell a $6.95 kit of the
> two PS transistors, HOT and .1 ohm resistor. I think the generac HOT and
> maybe an electrolytic is the cause for the HOT overheating. I would
> think a bad fly would have zapped it at once, not slowely heat it.
> Will advise. Please send me feedback.
> Phil
>
> Philip Bader
> Jan Phyl TV Inc. (estab. 1976)
> 3420 Recker Hwy. Winter Haven, Fl. 33880
> Fax (863) 299-8821
> email: tjanphyl@xxxxxxxxxxxxxxx
>
>
>
> Phil Bader wrote:
>
> >This was the typical G-Board power supply/ HOT/ drive transformer pins
> >soldering fix:
> >Q601,Q602 (2SC4834) R607 (.1 ohm 1w) and a shorted HOT Q502 2SC5148. A
> >very visable bad solder driver transformer as always. Replaced the G
> >board parts and HOT. Resoldered H. drive transformer of the ring cracks.
> >Well it came up beautifully and ran OK for 5 minutes. I noticed the HOT
> >was heating up pretty fast but the two PS transistors were cool.( I used
> >two of Acme's high quality 2SC4834P transistors.) I think they were not
> >the issue here. The HOT was a generac but same number. I feel the
> >overheated HOT took itself and the new PS transistors out.Dead
> >again,same parts. Is there certain lytics in the drive circuit in these
> >models like others (hi ESR,etc) and which ones? I walked away and before
> >I could get back to it, it went dead. Maybe 5 minutes.
> >Phil Bader
> >
> >
> >
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Carol Rundle
brundle@xxxxxxxxxxxxx
 


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