[TechAssist] Re: RCA CTC177BP2, questions about the pincushion capacitor

  • From: Kevin <kevintv@xxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Wed, 07 Jul 2004 13:26:51 -0700

I did replace the pincushion diode just to be safe.  "Is it safe?"
Thanks.  

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx 
 

-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of al m
Sent: Tuesday, July 06, 2004 2:36 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA CTC177BP2, questions about the pincushion
capacitor

I would change the damper diode and the pincushion diode too. That is if
it
has them.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, July 06, 2004 3:45 PM
Subject: [TechAssist] RCA CTC177BP2, questions about the pincushion
capacitor


> Here is one for you RCA experts out there.  Set came in with shorted
> HOT, D1885.  Replaced same with exact replacement that had lighter and
> different white printing on the case of the transistor.  Set fired up
> with HV and HOT instantly blew.  Replaced with C5297 and set came on
> this time with washed out picture with retrace lines and severe
> pincushion problem on the sides.  The picture also filled the screen
> slowly from the sides, making it appear to have a voltage regulation
> problem.  The width would also vary when the screen was adjusted.  Pin
> one of the STK measured -40.3 volts, well within specs.  Not a voltage
> regulation problem.  Found and replaced the pincushion capacitor,
C4407,
> a 47nF blue cap that was open and bulged.  All problems go away.
> FLABBERGASTED.
>
> Now my question is two fold:  Would this one pincushion cap cause all
> these problems including causing the HOT to short?  And could my
> original HOT that I installed been a fake?
>
> I have a second RCA set (two in one day), a CTC187CN3 that had a
shorted
> HOT as well, a BUH517.  I found a bad connection on the same
pincushion
> cap (this time a 41nF cap).  The customer also complained about having
> trouble getting the set to come on, and then when it did, the video
> would go off and on.  So far it is working fine on my test bench with
a
> new BUH517 installed and the bad connection repaired.  Could this same
> cap have caused these 3 problems as well?  Thanks for listening.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
>
>
>
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