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

  • From: Gary McCartney <gary@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Tue, 25 Nov 2003 17:58:23 -0500

I found one tip for CTC172:

TELEVISION      PROSCAN  CTC172ATA      NO RED IN PIX  


        REPLACE OPEN R5103 220K/ 1/2 WATT 




Gary McCartney

McCartney Electronics
Guelph Ontario Canada 
Est. 1984
email: gary (at) number63.ca







D Thunhurst 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
> 
> *****************************************************************************
> Lost Password:
> http://www.tech-assist.org  and select "Login Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/

--

*****************************************************************************
Lost Password:
http://www.tech-assist.org  and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/

Other related posts:

  1. Home
  2. techassist
  3. Archive
  4. 11-2003