[TechAssist] Re: Magnvox, 27TP83, ch. 27v505, no video

  • From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 26 Dec 2002 10:19:53 -0500

I forgot to mention to specifically check resistor R61 on the CRT board.
This is a common failure (220K, 1/4 watt). Replace it with a 1/2 watt.

Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx

----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, December 26, 2002 10:13 AM
Subject: [TechAssist] Re: Magnvox, 27TP83, ch. 27v505, no video


>
> First,
> Give us the voltage readings on all 9 pins of IC51 on the CRT board. Pins
> 1,2, and 3 are the R,G, and B inputs respectively (pins 7,8, and 9 are the
> outputs). Also scope the inputs to see if you have video coming in. If not
> then the video comes from IC200 (pins 21, 20, and 19 are R,G,B
> respectively). This should get you started.
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
>
> ----- Original Message -----
> From: "D Thunhurst" <dthunhurst@xxxxxxx>
> To: "TechAssist" <TechAssist@xxxxxxxxxxxxx>
> Sent: Thursday, December 26, 2002 9:05 AM
> Subject: [TechAssist] Magnvox, 27TP83, ch. 27v505, no video
>
>
> >
> > Good morning.
> > I hope everyone had a merry Christmas.
> > I am still having some problems with this set.  Originally it came in
with
> > sound and no vert. deflection, in on both sides about 3 inches and would
> > shut down after a few seconds.
> > I replaced R464 (went high in value), IC401 (9 volt reg), and IC550
(vert.
> > output).  Now, I still have sound, full deflection both vertically and
> > horizontally, bright raster with full retrace lines and no video.  I
have
> > the 200 volts to the crt board and all of the resistors check ok on that
> > board.  I could use a little advice on this one as I don't have the
> > schematic and Sams doesn't list anything one it.  Tritronics list a
manual
> > for it but at $60 plus shipping is out of the question.  I am leaning
> > towards jungle chip but not sure as this is a guess.
> > Thanks,
> > Daryl
> > Daryl's TV
> > 3310 Dyer St.
> > El Paso, TX 79930
> > 915-565-9184
> > 915-564-1024 Fax
> > http://dynacomp.freeyellow.com
> >
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>
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