[TechAssist] Re: Sanyo DS27590 Intermittent/No start
- From: "Lyles Tv" <tech@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 18 Dec 2002 15:19:50 -0600
Just something I fixed the other day---not sure if it will apply to this
chassis
Sanyo
Model:DS27510
Chassis:
Dead---fix---replace Q605 2sa608n/nte 290a
Then units squeals Q601 C4423/nte2308 and Q604 C3807/nte2504
Comments:After replacing Q605, if you let it run with squeal, it will kill
the other 2 components
Jeff Farnsworth
Lyles TV and Appliance
17 S Washington St
Elkhorn, Wi. 53121
ph 262-723-3477
fax 262-723-3658
tech@xxxxxxxxxxx
----- Original Message -----
From: "John Mielke" <maintv2002@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, December 18, 2002 3:02 PM
Subject: [TechAssist] Re: Sanyo DS27590 Intermittent/No start
>
> Hello. If the power supply runs but the output is too high, check Q604
> (2SC4423) for short base to emitter. The power supply should run in
> standby when off, the collector of the HOT should be about 80 volts. If
> you need to replace Q601 you must use the original transistor type or it
> will overheat and fail in a few days (you can use a NTE2308 to test the
> set). BTW, IC681 (upc78L05J) is a common failure causing a lot of
> strange problems when the output is too high (more than 5 volts). I
> have also had bad POI D612 (TLP621 or NTE3098). You can short Q693 base
> to ground to force the power on and I use a light bulb to load the +130v
> line (the set will not come on even tho PS at full unless you push the
> power button. John.
>
> John Mielke
> Main TV
> Longmont, Co
> maintv2002@xxxxxxxxxxxxx
>
>
>
> Larry E. wrote:
> > Hi guys, This Sanyo DS27590 will start up everytime on a variac at 105
> > volts, most of the time at 110 volts but never at 117/120, I don`t
> > have the print for it, I tried to monitor what I ASSume is the regulator
> > transistor, Q601`s collector but it reads 153 volts with 105 volts AC
> > applied and goes to over 200v with 120 volts AC applied, strange thing
> > is the collector voltage on the HOT (Q402) at 105 volts is only 85
> > volts, at 120 it decays very rapidly, ANY HELP APPRECIATED, Larry E
> >
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl.
> > http://www.tvjunkyard.com
> >
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>
> --
> John Mielke
> Main TV
> Longmont,Co
> 303 776 6955
> maintv2002@xxxxxxxxxxxxx
>
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