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

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Mon, 20 Oct 2003 16:48:03 -0500

CR19710   234048 / MUR115 / NTE587
CR19713   234048 / MUR115 / NTE587

Do you have schematic of Conv. P/S board ?
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX

----- Original Message ----- 
From: "Kevin" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, October 20, 2003 2:50 PM
Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems


> Is that 215496 and 215495?  The current condition is the voltages come
> up for a split second when I turn the set on, then they drop down to
> zero, except for the 23 volts which remains constant @ 22 volts and the
> +45 volt line which drops down to 20-25 volts.  If I disconnect one yoke
> (hor and vert yoke) the voltages all stay up but the other 2 tubes do
> not come on (must be some kind of protection circuit).  I just replaced
> both of the ECG587 diodes with ECG588--no luck, same symptoms.  Can you
> tell me what the 15 volt diode NTE cross is?  Maybe they are faulty.
> TIA
>
> 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: Monday, October 20, 2003 11:51 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
>
> Sometimes I overlook the obvious.  I have seen bad connections on the
> electrolytics in the secondary...
>
> I work on enough of these that I have known good modules, I swap modules
> on
> service calls and then rebuild the old ones.
>
> Those smd transistors 215496 and 215496 (compliments) are notorious.  I
> keep
> a bag of each on hand.
>
> Can you give a recap of the current condition?
>
> 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: Monday, October 20, 2003 1:24 PM
> Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
>
>
> > This set does have the red and green convergence yokes reversed.  I
> > replaced all those parts except for Q19705 SMD, which tests good out
> of
> > circuit.  More testing!  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: Monday, October 20, 2003 5:39 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
> >
> > OK, This "discussion" about this power supply was active on another
> list
> > on
> > Friday.
> > This is a good power supply to learn, you know how Thomson uses the
> same
> > circuits in many places and for many years.
> >
> > If any of these parts are bad, replace all of them, you will be saving
> > yourself time and money.
> > Q19701 pn 246967
> > Its source resistor! R19706 1.2 ohm 2w 250661
> > Q19702 147665
> > Q19703 232218
> > Q19704 229220
> > U19700 223653
> > U19701 231525 This is the voltage reference ic.
> > Q19705 smd 215946
> >
> > Check the following:
> > cr17903 off the base of smd q19705 8.2v if installed!  It isn't always
> > there.
> > The FET base resistor, in this case R19703 15 ohms 1/2Watt.  Note that
> > many
> > times this resistor will be blown up.
> >
> > Now, a possible cause for the failure,
> > In the secondary of the supply, CR19713 and CR19710m on the 45v supply
> > have
> > been upgraded do to failures.  They may be leaky or shorted, and may
> > test
> > good.
> >
> > Old number 227066
> > New number 234048.
> > The serial numbers for the sets that require the new diodes are:
> > 145xxxxxx
> > b45xxxxxx
> > to 212xxxxxx
> > c12xxxxxx
> > A short detour. The first digit is the year, the next two are the
> week,
> > of
> > manufacture.  0=A 1=b In other words, any set made between the 45th
> week
> > of
> > 2001 and the 12th week of 2002.  If the power supply had been replaced
> > previously....?
> >
> > The above parts are specific to this power supply.  This basic power
> > supply,
> > with variation, is used in the ctc195, 197, 203, atc113 the mm series
> > and
> > some of the dtv and atc series sets, both to run the set or to run the
> > convergence modules.
> >
> > Although this does not apply to this particular set, note also that on
> > some
> > ctc195s the red and green yoke plugs are reveresed.
> >
> > 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: Monday, October 20, 2003 3:39 AM
> > Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence problems
> >
> >
> > > More testing:  If I disconnect any of the yoke connections the
> > > convergence P/S voltages all remain constant but the other two CRT's
> > > don't light up.  Disconnecting any of the convergence yokes has no
> > > effect.  I think my convergence P/S is fine, but what is making it
> > shut
> > > down?  TIA
> > >
> > > 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 Kevin
> > > Sent: Sunday, October 19, 2003 10:33 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence
> problems
> > >
> > > I have done more testing, and I found that all of the voltages come
> up
> > > to their proper values and then disappear after 2-3 seconds.  Except
> > for
> > > the 23 volt line which remains on.  I checked the convergence board
> > and
> > > found no shorts.  Is the convergence P/S supposed to work without a
> > load
> > > connected?  The voltages don't come up at all without a load.
> 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 Intrepid Video
> > > Support
> > > Sent: Sunday, October 19, 2003 7:47 PM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Re: RCA PTK195M26A, P46921, convergence
> problems
> > >
> > > 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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