[TechAssist] Re: RCA PTK195M26A, P46921, convergence problems

  • From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sun, 19 Oct 2003 22:46:56 -0400

Kevin,
From Tech Repair CD:
RCA\P52810LV PTK195AB\Convergence was pretty bad\Went into menu to pull up 
cust. convergence and it wasn't
there\\PTK195AB\R19703 was open on convergence power board(750K 1/2watt)\\\\\\\\

RCA\PTK195\CONVERGENCE BAD* BOWED IN TOP AND BOTTOM* NO VOLTAGES J19701\\\\E-C 
SHORT ON Q19707(SMD) AMP ON
CONV POWER 1 BD\\\\\\\\

RCA\PTK195\Loss of convergence appearing as a pincushion defect along with no 
convergence menu
item\\\\Q19338 (227406) on the convergence PCB\The power supply was actually 
shutting down due to
excessive current\\\\\\\



Jeff Dougherty
Intrepid Video TV/VCR
263 S Front St
Steelton PA 17113
fax...717-564-4952
www.intrepid-video.com www.tech-repair.net

Chicago
----- Original Message -----
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Sunday, October 19, 2003 7:35 PM
Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems


> I checked the voltages and the convergence power supply is not working!
> I changed 7 parts but must have missed one.  The -45V, -15V are missing;
> and the 45v line is 25v and drops as I measure it, and the 23v and 15v
> are missing.  Do you have a schematic for the new improved convergence
> P/S?
> This P/S has the fet and 4 small driver transistors.  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 Wayne Vanaman
> Sent: Sunday, October 19, 2003 12:53 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
>
> If there are no convergence options on the users menu it means that the
> convergence IC is not talking to the main IC.  This would happen on plug
> in.
> The thing thinks it is a direct view tv.
>
> What you need to do is
> a. check for +- 15 and 40something on the diodes of the secondary, so
> that
> you know the power supply is working.
> 2. ensure that the convergence ic has power supply, the coils I
> mentioned.
> III.ensure a "line of communication" between the convergence IC and the
> main
> ic.  That is, see if there is data activity at the convergence IC at
> plug
> in.
>
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, Fl.  32506-3310
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> WWW.PensacolaTVRepair.Com
>
> 850-456-5995 voice
> 850-458-6369 fax
>
>
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, October 19, 2003 2:31 PM
> Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
>
>
> > Hi Wayne,
> >
> > No, I could not find the convergence adjust menu options in the users'
> > menu.  I also noticed that the heat sinks on the convergence board are
> > remaining cold when I leave the set on for 30 minutes.  I am going to
> > measure the voltages coming out of the convergence P/S as a start.
> Off
> > hand do you know what they are supposed to be?  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 Wayne Vanaman
> > Sent: Sunday, October 19, 2003 4:16 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
> >
> > Hi Kevin.
> >
> > Pull the shields off of the control area on the convergence board and
> > see if
> > that takes care of it.  (Don';t leave them off, of course.)  There was
> > an
> > "issue" with shield covers touch traces/parts causing problems.
> >
> > Of course there could be a defective power transistor, but I have seen
> a
> > few
> > with open filter coils, again, under the shield covers.  Do you get
> the
> > convergence adjust ment options ("Adjust Projection TV") in the users
> > menu?
> >
> > Wayne Vanaman
> > Omega Electronics
> > 6904 W Fairfield Dr
> > Pensacola, Fl.  32506-3310
> >
> > Wayne@xxxxxxxxxxxxxxxxxxxxx
> > WWW.PensacolaTVRepair.Com
> >
> > 850-456-5995 voice
> > 850-458-6369 fax
> >
> >
> > ----- Original Message -----
> > From: "Kevin" <kevintv@xxxxxxx>
> > To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx>
> > Sent: Saturday, October 18, 2003 9:02 PM
> > Subject: [TechAssist] RCA PTK195M26A, P46921, convergence problems
> >
> >
> > > Original problem was open 5amp main fuse caused by bad convergence
> P/S
> > > board.  Replaced numerous parts in P/S (the newer design without the
> > > STK's) and now the set fires up but the convergence is way off.  Top
> > and
> > > bottom is pin cushioned for each gun.  Any help would be appreciated
> > as
> > > the customer is moving on Tuesday morning and he lives 30 miles
> away.
> > > TIA.
> > >
> > > Kevin Wilks
> > > Kevin's TV & Video Repair
> > > Penticton BC Canada
> > > kevintv@xxxxxxx
> > >
> > >

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