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

From: "D Thunhurst" <dthunhurst@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Wed, 26 Nov 2003 16:36:00 -0700
Robert,
Thanks for the offer.  Lets hold off until after Thanksgiving.  Several
member have been so kind as to offer suggestions.  Most of them I need to
check out since I haven't been in that area.  It never seems to fail.  When
you finally get around to doing things you have put off, everybody has
something else in mind for you.
To everyone.... Have a safe and Happy Thanksgiving and as always...remember
the turkey should be the only thing being stuffed :-)
Daryl
Daryl's TV
3310 Dyer St.
El Paso, TX 79930
915-565-9184
915-564-1024 Fax
dthunhurst@xxxxxxx
http://dynacomp.freeyellow.com
-----Original Message-----
From: R&S Electronics <rsteph44@xxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Wednesday, November 26, 2003 9:33 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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[TechAssist] Re: RCA, G34170AT, CTC172AT, blue picture

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