[TechAssist] Re: DBTV2500 Repeat failure IC501
- From: "John at Main TV" <maintv2004@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 10 Jun 2004 09:42:03 -0600
OK, that explains it. The HOT shorting is the cause of the problem and the
bad regulator is the result of that. As someone else already said, change
C446. John.
John Mielke
Main TV
636 main St.
Longmont, Co
phone 303 776 6955
fax 303 776 0792
maintv2004@xxxxxxxxxxx
----- Original Message -----
From: "D Trippel" <dtrippel@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, June 09, 2004 6:52 PM
Subject: [TechAssist] Re: DBTV2500 Repeat failure IC501
> Hi!
> The reg always shorts, and takes out the two resistors and the hot. I
didn't ring
> the flyback. But if the set works for a month, I would think the flyback
would be
> good. But anything is possible. Everything appears to run cool after
replacement.
> And you can only have a set on the bench for so long. They are selling
these
> things so cheap I guess there designed to fail allot. I checked 519, It
tested
> good, but this time I will replace it. Thanks!
> Don
>
> John at Main TV wrote:
>
> > That would be the same as a Memorex in the US. You may need to have the
> > original regulator that has an internal connection to pin 5 (usually pin
5
> > is open). The output voltage should be 136.6v and the V on pin 2 should
be
> > 137.3v. Also check R506 (180-20watt) and R507 (47 ohm-quarter watt) and
> > C519 (10uf- 160v). How did the regulator fail originally, short or
open?
> > John.
> > > >
> > ----- Original Message -----
> > From: "D Trippel" <dtrippel@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Wednesday, June 09, 2004 3:41 PM
> > Subject: [TechAssist] DBTV2500 Repeat failure IC501
> >
> > > Hello Everyone!
> > >
> > > I Have a couple of Durabrand DBTV2500 tv's that have repeat failure of
> > > ic 501 str30110 reg , R506 20w , R 508 and Q 401 hot. Both of these
> > > sets ran about a month and are back. Same problem. Has anyone out
there
> > > found the cause . I have checked a variety of components in the reg
> > > circuit , and other than the parts listed everything checks out fine.
> > > Any help would be appreciated.
> > > Don trippel
> > > Don's Electronics
> > > Rosthern,Sask
> > > Canada
> > >
> > >
> > >
> >
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