[TechAssist] Re: Sony TV KV32TS46 power supply transistors
- From: "Leonard Caillouet" <lcaillo@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 7 May 2004 06:21:19 -0400
Sony is supplying these to the distributors in bulk and they have to repack
them. I have done extensive testing on these transistors and find no value
in using the ridiculously priced Sony supplied parts over generics from a
reputable supplier. The rank is important, but there is also a large
variance in gain even within a given rank, even from Sony. I buy them in
batches, match them by rank and junction bias, verify the duty cycle, and
only use the P rank. The values of the other parts in the supply can
affect the duty cyle as well. The key to these circuits is being thorough
in testing.
FYI, any of you who have been trying to communicate with me recently should
not the new email address. The old one has been giving me problems and I
have likely missed messages over the past few weeks.
Leonard Caillouet
Electronics World
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 07, 2004 12:52 AM
Subject: [TechAssist] Sony TV KV32TS46 power supply transistors
> I have a Sony TV model KV32TS46 that has shorted power supply
> transistors Q601 and 602.
>
>
> I ordered Sony original 2SC4834's from Globel, part # 8-729-019-49.
> Apparently this is a replacement part number for the original part
> number.
>
> These parts came in a Globel parts bag with a computer printed sticker
> labeled 8-729-019-49 instead of a Sony bag. The transistors leads are
> preformed to fit the PCB. (I don't notice any marks on the leads to
> think someone bent them with pliers, they look like a machine bent
> them). Date code is 0237. Does anyone know if these really are Sony
> originals? I also ordered the VDR's from them and they ARE in Sony
> original packages. I ordered generic 2SC4834's from them as well and
> they look the same except the leads are straight and the date code is
> 0243.
>
> Now another possible problem is the gain rating of these transistors.
> The shorted ones in the TV are rated "P" The alleged Sony originals I
> purchased are rated "M" and the generic ones are rated "N". I thought I
> read in previous messages that "P" gain transistors will run cooler and
> since thats what was in the TV to start with, what should I do?
>
> Thanks for any help.
> --
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
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