[TechAssist] Re: Sanyo TV Model DS31590 - 15 minutes shuts off
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 12 Nov 2002 09:26:59 -0500
Maybe it would be better to use a 78M05 (0.5A) or a 7805 (1.0A) instead
of a 78L05 (200mA), unless physical spacing does not permitt the larger
part.
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Thanks.
Gary McCartney
McCartney Electronics
7134 Fife Rd, RR 7
Guelph Ontario Canada N1H 6J4
Fax: (519)821-1530
Premium Technologies wrote:
>
> You're right Charles, my typo mistake, it is NTE 977 or you could use an NTE
> 85. But it would be my preference to stick with the original as a first
> choice, UPC78L05. These units seem to have a common flaw of loading down at
> the input and stressing the regulator. When the regulator eventually goes
> critical, (t/u in tech talk), they usually run 7v or more, until the relay
> can no longer stay latched, like Ken pointed out. I worked on one back in
> August that also had the picture dimming as it went out. Replacing the
> regulator fixed it.
> Bill
> Premium Technologies
> 27501 V Street
> Ocean Park, WA. 98640
> Phone: (360) 665-5984
> Fax: (815) 425-8530
> email: premtech@xxxxxxxxxxxxxx
> ----- Original Message -----
> From: "repair1" <repair1@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, November 11, 2002 8:57 AM
> Subject: [TechAssist] Re: Sanyo TV Model DS31590 - 15 minutes shuts off
>
> >
> > I think you mean nte977, 577 is an ultra fast switching diode, hth.
> > charles betzler
> > Best Electronics
> > repair1@xxxxxxxxxxxxx
> >
> >
> >
> > ----- Original Message -----
> > From: "Premium Technologies" <premtech@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Monday, November 11, 2002 11:55 AM
> > Subject: [TechAssist] Re: Sanyo TV Model DS31590 - 15 minutes shuts off
> >
> >
> > >
> > > Hi Wally,
> > > Check IC681, UPC78L05, (cross: NTE577). Should read 5v or just slightly
> > > less. If not replace it and that should fix the problem. I might have
> a
> > > data on the jungle, I'll check tomorrow.
> > > Hope this helps.
> > > Bill
> > >
> > > Premium Technologies
> > > 27501 V Street
> > > Ocean Park, WA. 98640
> > > Phone: (360) 665-5984
> > > Fax: (815) 425-8530
> > > email: premtech@xxxxxxxxxxxxxx
> > > ----- Original Message -----
> > > From: "Wally Heise" <sirepair@xxxxxxxxxx>
> > > To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
> > > Sent: Sunday, November 10, 2002 8:21 PM
> > > Subject: [TechAssist] Sanyo TV Model DS31590 - 15 minutes shuts off
> > >
> > >
> > > >
> > > > Hello,
> > > >
> > > > I am repairing a Sanyo tv DS31590 which has 2 problems. First, a few
> > > > seconds after the picture comes on, it dims to about half brightness.
> > > > Second, every 15 minutes it turns off like the sleep timer is
> activated.
> > > > Checking the menu, the sleep timer is not activated. Has anyone seen
> > > these
> > > > problems on a Sanyo, or have any ideas, are the 2 symptoms related? I
> > > need
> > > > to order the schematics, or if someone has the pin outs of the jungle
> > IC -
> > > > LA76170N, i would appreciate any information you might have. I have
> > tried
> > > > Sanyo, Google, Free Trade Zone and Chip Quest but no one has the data
> > > sheet
> > > > for this IC.
> > > >
> > > > Thanks,
> > > > Wally Heise
> > > > South Isle Repair
> > > > Isle, Mn.
> > > > sirepair@xxxxxxxxxx
> > > >
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