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

  • From: Kevin <kevintv@xxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sun, 19 Oct 2003 17:35:23 -0700

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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