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

  • From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Tue, 28 Jun 2005 06:51:55 -0400

Definitely replace the HOT with a good quality reputable transistor and also
replace capacitor C502 off the horizontal driver transformer.

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


----- Original Message ----- 
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
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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