[TechAssist] Re: RCA CTC157 no video, has HV and OSD

From: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Sun, 14 Aug 2005 15:41:09 -0400
Thanks John: I will print this and take with me. Great info like this really
makes this list.

Perry Bower
Electric Medic
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-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of John Conti
Sent: Sunday, August 14, 2005 2:24 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA CTC157 no video, has HV and OSD


Perry. here,s what I have on this ctc157 Q2901 is the luminace buffer a PNP
transitor. The base of that has 6.9 volts the emitter 6.84 and the col.
shows "0"volts. The base gets its Y-out from pin 13 of ic U1001 luma/chroma
processor, which shows 6.9 volts. The video detector comes out of pin 47 off
ic u1001 a 4.59 volts to video buffer Q2305 that shows 5.15 at emiter and
4.59 at base and and coll. goes to ground. This transistor then couples to
Q2302 the video inverter , emitter show 4.48 v
and base shows5.12v and coll. 9.75v where all of this signal is carried to
pin 49 of ic U1001.

also you might want to check the beam limit 2703 and the osd black inverter
Q2706 for shorts.
Good luck

John
Conti,s TV
Texas

iFrom: "Electric Medic" <info@xxxxxxxxxxxxxxxxx>
>Reply-To: techassist@xxxxxxxxxxxxx
>To: <techassist@xxxxxxxxxxxxx>
>Subject: [TechAssist] Re: RCA CTC157 no video, has HV and OSD
>Date: Sun, 14 Aug 2005 12:29:29 -0400
>
>Thanks Guys. I am going on the service call tomorrow. Just wanted to be as
>prepared as possible in case this little old lady is looking over my
>shoulder. She is a great grandma and wants this late 80's console fixed
>really bad. I was aware of the 2906 on the 169's, but that usually causes
>bright screen, retrace. I wasn't sure on the 157. Also, mine isn't bright
>screen and retrace. I have black screen with HV and OSD and good detected
>audio, just no video.
>
>Perry Bower
>Electric Medic
>"It's Cheaper to Keep Her"
>http://www.electricmedic.com
>3850 Washington Road  Suite 4C
>Martinez, Georgia 30907
>Phone: 706-8MEDIC4  (863-3424)
>Phone: 706-863-3474
>Fax: 706-863-2316
>mailto:info@xxxxxxxxxxxxxxxxx
>
>
>-----Original Message-----
>From: techassist-bounce@xxxxxxxxxxxxx
>[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Bill Grabowski
>Sent: Sunday, August 14, 2005 9:18 AM
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Re: RCA CTC157 no video, has HV and OSD
>
>
>On the CTC157 I believe the location is Q2901 and on a CTC169 its Q2906.
>**********************
>Bill Grabowski
>Triangle Appliance
>3813 Roosevelt Rd
>Kenosha WI  53142
>262-694-6500
>262-694-6523   fax
>bgrabowski@xxxxxxxxx
>**********************
>
>
>
>Electric Medic wrote:
>
> >Hey Bill and All: Is it Q2901 or Q2906 that commonly fails on this CTC157
> >that causes no video, good sound and has OSD. WinStips shows Q2901 and
> >everybody else says Q2906 is the transistor that fails. I have no video,
>but
> >have sound and OSD, just a blank screen. Also, could it be a tuner on
>this
> >set, or if you have good audio the tuner must be good like on some?
>Customer
> >said lightning hit it and she had some other things in her house hit.
>Does
> >anyone from this chassis time frame remember if one of these transistors
> >failed from surge? Also is the 143806 the correct part number instead of
>the
> >159. Thanks
> >
> >Perry Bower
> >Electric Medic
> >"It's Cheaper to Keep Her"
> >http://www.electricmedic.com
> >3850 Washington Road  Suite 4C
> >Martinez, Georgia 30907
> >Phone: 706-8MEDIC4  (863-3424)
> >Phone: 706-863-3474
> >Fax: 706-863-2316
> >mailto:info@xxxxxxxxxxxxxxxxx
> >
> >
> >-----Original Message-----
> >From: techassist-bounce@xxxxxxxxxxxxx
> >[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Bill Grabowski
> >Sent: Tuesday, September 30, 2003 5:43 AM
> >To: techassist@xxxxxxxxxxxxx
> >Subject: [TechAssist] Re: RCA CTC157 Luma Buffers Repeat Failure!
> >
> >
> >In a pinch I've used the ECG159 and have had them fail but never had a
> >143806 fail unless the pix tube had intermittent short. Possibly  check
> >with CRT tester and remove any shorts with pix tube laying on face. Just
> >my 2 cents.
> >
> >                                                     Bill
> >
> >Bill Grabowski
> >Triangle Appliance
> >Kenosha,WI 53142
> >bgrabowski@xxxxxxxxx
> >
> >Shoreline Electronics wrote:
> >
> >
> >>Make : RCA
> >>Chassis : CTC157 series.
> >>Problem : Shorts out Q2906 luma buffer every few days....customer hears
>a
> >>ZAP then set goes to washed out screen with retrace.
> >>
> >>I'm using ECG159 subs ( 2N3906 generics)
> >>
> >>Is there an intermittent short ( HK?) causing this or do I need a
>beefier
> >>buffer transistor to resist failure ?
> >>
> >>
> >>==========================
> >>Jeff Stielau
> >>Shoreline Electronics Repair
> >>344 East Main Street
> >>Clinton,CT 06413
> >>860-399-1861
> >>860-664-3535 (fax)
> >>jstielau@xxxxxxxx
> >>==========================
> >>"If you push something hard enough it will fall over."
> >>Fudd's First Law of Opposition - Sir Sidney Fudd
> >>
> >>
> >>
> >>
> >>
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> >--
> >*****************************
> >Bill Grabowski
> >Triangle Appliance
> >Kenosha,Wi 53142
> >262-694-6500
> >262-694-6523 fax
> >bgrabowski@xxxxxxxxx
> >*****************************
> >
>
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>**********************
>Bill Grabowski
>Triangle Appliance
>3813 Roosevelt Rd
>Kenosha WI  53142
>262-694-6500
>262-694-6523   fax
>bgrabowski@xxxxxxxxx
>**********************
>
>
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References:
- [TechAssist] Re: RCA CTC157 no video, has HV and OSD
  - From: John Conti
[TechAssist] Re: RCA CTC157 no video, has HV and OSD

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