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

From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Thu, 26 Dec 2002 20:11:46 -0500
Pins 7, 8, and 9 should be about 143 volts or so but since you have no video
input, it makes sense. Looks like you do probably have a bad signal
processing IC (IC200). The newest part number is 483520988503 and is in
stock at Tritronics for under $20.00

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@xxxxxxxxxxxxx>
Sent: Thursday, December 26, 2002 1:16 PM
Subject: [TechAssist] Re: Magnvox, 27TP83, ch. 27v505, no video


>
> Bob,
> As requested, the voltages in IC 51 are as follows:
> p1=1.35v
> p2=1.34v
> p3=1.34v
> p4=0v
> p5=1.34v
> p6=198.7v
> p7=49.2v
> p8=57.6v
> p9=43.1v
> I don't show any video present whatsoever on any of the pins of IC200.
> Now I seem to be loosing a little ground on it.  It is now giving a raster
> that progressively gets brighter and is going into shutdown.  I rechecked
> the resistors on the crt board and found none bad.
> Daryl
> Daryl's TV
> 3310 Dyer St.
> El Paso, TX 79930
> 915-565-9184
> 915-564-1024 Fax
> http://dynacomp.freeyellow.com
> -----Original Message-----
> From: Gemini Computer & TV <geminitv@xxxxxxxxxxxxxxxx>
> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> Date: Thursday, December 26, 2002 8:07 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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References:
- [TechAssist] Re: Magnvox, 27TP83, ch. 27v505, no video
  - From: D Thunhurst
[TechAssist] Re: Magnvox, 27TP83, ch. 27v505, no video

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