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

  • From: "D Thunhurst" <dthunhurst@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Thu, 26 Dec 2002 11:16:55 -0700

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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