[TechAssist] Re: HOT subs in general question
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 04 Aug 2003 01:27:30 -0400
I just repaired a Panasonic 32" model CT-3269SCW which required a HOT.
Because these posts about HOT subbing were currntly on the list, I
decided to experiment a bit. The original HOT was a 2SD2539 which is
rated 5A, 1500V with a damper internal. I first tried a generic 2SD1880
(8A?) and after an hour running the set, the temperature on the heatsink
directly above the HOT was 49 deg. C. The I tried a generic 2SD1879
(6A). After an hour, the temp. was 53 deg. C. Then I tried an OEM
Panasonic 2SC5339 which is the new generation replacement for the
original 2SD2539 in the set. The temp. after an hour was 44 deg. C. Then
I installed an extra heatsink at the top of the HOT's tin plate
heatsink. This extra heatsink was just a folded thick aluminum plate
about 6 sq. inches altogether. The temp then went down to about 41 deg.
C. I left the heatsink in and returned set to the customer.
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
email: gary (at) number63.ca
Damon wrote:
>
> Ok, I'll keep the 1879's AND the 1881's......any rhyme or reasoning on the
> 1881's getting hot??? Example: OK on Projos, bad on 25".......Ok on any
> brand except this brand......
>
> The 1881's are most likely not turning on hard enough to operate as a switch
> under these circumstances.
>
> Damon Brunger
> Telrad Electronic Services
> Ft Wayne, IN 46815
>
> ----- Original Message -----
> From: "Bil Green" <tv.vcrrepair@xxxxxxxxxxx>
> To: "Damon" <techassist@xxxxxxxxxxxxx>
> Sent: Friday, August 01, 2003 9:19 PM
> Subject: [TechAssist] Re: HOT subs in general question
>
> > Haven't you noticed that using the D1881 when replacing a lower
> > amperage HOT causes it to overheat? It does happen, and too often
> > for me. That's why I stock several of the lower amp ones also.
> >
> > Same with the D1887 (no damper diode version). You guys do have
> > the right idea though - Generics are the way to go (except for
> > the counterfeits).
> >
> > --
> > Best regards,
> >
> > Bil Green
> > 2001 TV VCR
> > Mammoth Lakes, CA 93546
> > 760-934-2001 mailto:tv.vcrrepair@xxxxxxxxxxx
> >
> > Thursday, July 31, 2003, 5:55:46 AM, you wrote:
> >
> > D> Yeah, that's definitely one of them, if not the only one.....much more
> > D> power/current handling capability than the old 2SD1879, which was the
> MOST
> > D> UNIVERSAL replacement beforehand.
> >
> > D> Now that I know the 2SD 1881 is the one to keep, I'll phase out the 2SD
> > D> 1879's.
> >
> > D> Damon Brunger
> > D> Telrad Electronic Services
> > D> Ft Wayne, IN 46815
> >
> > D> ----- Original Message -----
> > D> From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> > D> To: <techassist@xxxxxxxxxxxxx>
> > D> Sent: Wednesday, July 30, 2003 12:30 PM
> > D> Subject: [TechAssist] HOT subs in general question
> >
> >
> > >> A tech friend says if he cannot get, or ID an HOT he will sub a
> > >> 2SD1881. Says thiis 1881 seems to be a general heavy transistor for at
> > >> least test/estimate purposes.
> > >> Yesterday he had a Sharp with bad HOT 2SD2586.No subs avail. OEM a week
> > >> away.
> > >> Used an 1881 and ran cool.
> > >> I want to improve my TV HOT selection bin. Is there a certain selection
> > >> that are "must haves"?
> > >> Phil Bader
> > >> --
> > >> Philip Bader
> > >> Jan Phyl TV Inc. (estab. 1976)
> > >> 3420 Recker Hwy. Winter Haven, Fl. 33880
> > >> Fax (863) 299-8821
> > >> email: tjanphyl@xxxxxxxxxxxxxxx
> > >>
> > >>
> > D>
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