[TechAssist] Re: Sanyo DS 31590,Need PDF of power supply in shut down
- From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 21 Jun 2003 11:16:04 -0500
Tested with 40 W. light bulb results are: in standby bulb is dim flashing
at turn on B+ goes to 126.7 and light is bright stays on about 2.5 sec then
relay drops out back to stand by .Yoke and fly test good.
Country TV
Ron Miller
Inez, TX. 77968
----- Original Message -----
From: "John at Main TV" <maintv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, June 21, 2003 10:56 AM
Subject: [TechAssist] Re: Sanyo DS 31590,Need PDF of power supply in shut
down
> Good morning. Since your PS output is low even in standby I think you
> have a PS problem. You could remove the HO and replace it with a 40
> watt light bulb (from C to ground) and then check PS. In the PS check
> Q601 and Q604. If either is bad change both with the same number (NTE
> or others may work for testing but they will overheat). Q635, Q695, and
> D612 (the photo-optic isolator TLP621 or NTE3098) are common problems.
> Always change these 3 things together. It could be that your PS is not
> turning on fully. It normally runs in standby at 75-80 volts output.
> The turn-on signal comes from the micro pin 27 through Q681, Q693 and
> Q695. If you ground Q693 base that should force the PS full-on. BTW,
> your model is listed in Sams 4355 and is similar to Sams 4339,4500,
> 4363, 4616, 4404, 4393. Also for your notes IC681 (5v reg near the
> micro) can cause strange problems if the output is high and shorted
> zener diodes in the video section are a common problem. John.
>
>
> Ron Miller d.b.a. Country TV wrote:
> > In standby B+ at HO is 81.3 turn set on drops to 72vdc get slight buzz
in
> > speakers then click shut down.Can do this 3 times then have to unplug to
> > reset.Have No SM, flyback and yoke ring good caps in PS area esr good.PS
> > devices check good on my fluke 87 diode test .
> > I have Adobe 6 installed, like to fix this one before it turns into a
DOG.
> > tia
> > Country TV
> > Ron Miller
> > Inez, TX. 77968
> >
> >
> >
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> --
> John Mielke
> Main TV
> Longmont,Co 80501
> 303 776 6955
> 303 776 0792 fax
> maintv@xxxxxxxxxxx
>
>
>
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