[TechAssist] Re: RCA, G34170AT, CTC172AT, blue picture

  • From: "al m" <ampm@xxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 26 Nov 2003 12:11:51 -0500

If that is not a RCA chassis, I had one that there were open resistors on
the CRT board. Can't remember the model # but it wasn't RCA chassis. My
problem was green screen.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: "R&S Electronics" <rsteph44@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 26, 2003 11:47 AM
Subject: [TechAssist] Re: RCA, G34170AT, CTC172AT, blue picture


> Daryl:
>   I have the microfiche for the CTC172 if you can use
> it I will send it to you.
> Robert Stephens
> R&S Electronics
> 1231 S. Eddy
> Pecos,Texas
>        79772
> rsteph44@xxxxxxxxx
> --- D Thunhurst <dthunhurst@xxxxxxx> wrote:
> > Hi,
> > I have a 34" RCA cinema screen, model G34170AT,
> > using CTC172AT chassis (I
> > haven't seen this type of set or chassis before)
> > uses crt # W86EDV083X071.
> > This set was diagnosed by another shop as having a
> > bad crt.  After close
> > inspection, I found the tube to be very good.  The
> > symptoms are: blue
> > picture, very little red and green.  It has a slight
> > dark smear trailing to
> > the right of the images with some white trailing on
> > bright scenes.  Red and
> > green screens are at max and the blue is at minimum.
> >  The collector voltage
> > is a bit low on the blue driver as compared to the
> > red and green. The
> > collector voltages on the red is 203v. and the green
> > is 199v. and blue is
> > 159v.  I checked all components on the crt board and
> > the buffer transistors
> > before the crt board.  I replaced U2901, RGB matrix
> > IC.  No help there. I
> > don't have a schematic on this and Sams doesn't even
> > list one available.
> > U2901 is a Toshiba IC part number TA7730P (RCA
> > 214701) and I haven't found
> > any information on this chip. It only took about a
> > year and half to get this
> > IC.  The customer as well as myself had given up
> > getting this IC and I ended
> > up with this dog.
> > Can anyone help on this unusual set or offer some
> > advice as to whether I am
> > wasting my time and need to look elsewhere?
> > Sure could use a scan of the RGB and video circuits.
> > Thanks,
> > Daryl
> > Daryl's TV
> > 3310 Dyer St.
> > El Paso, TX 79930
> > 915-565-9184
> > 915-564-1024 Fax
> > dthunhurst@xxxxxxx
> > http://dynacomp.freeyellow.com
> >
> >
> >
>
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