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

  • From: Kevin <kevintv@xxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Mon, 20 Oct 2003 11:17:55 -0700

I replaced all but CR19713, but it tested good out of circuit.  I was
going to replace it anyways, but my supplier only had 1 ECG587.  I will
find a used one and see if that fixes my problem.  How can I test C19706
for leakiness?  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
tvservice@xxxxxxxxxxxxx
Sent: Monday, October 20, 2003 7:18 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems

Did you replace all these listed parts?
Q19701      246967 / P4NB50FP
Q19702      147665 / NTE159
Q19703      232218
Q19704      229220 / NTE123AP / 2N3904 / BC547
U19701      231525 / NTE999
CR19701   198589 / NTE519
R19703      241313 / 15 ohm 1/2 w
CR19710   234048 / MUR115 / NTE587
CR19713   234048 / MUR115 / NTE587
F14201      175425 / GMA 5A

if so and still having problems but not blowing line fuse check C19706
leaky
replace with 239176 820pf surface mount cap
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX

----- 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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