[TechAssist] Re: FIXED UPDATE Re: RCA PTK195M26A, P46921,convergence problems
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 22 Oct 2003 11:44:04 -0700
New convergence P/S came in at 11:30 AM, set is now converging properly.
Customer is leaving around 2 PM. It's nice when things work out (well
sort of!). Does this set have auto convergence? 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 Kevin
Sent: Tuesday, October 21, 2003 1:57 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: UPDATE Re: RCA PTK195M26A, P46921, convergence
problems
I disconnected all the convergence yokes and found that my convergence
P/S powers up with all the proper voltages. When I connect the green
convergence yoke the voltages drop 10-15% and the green tube is
converged. But when I connect either of the blue or red convergence
yokes (by themselves) the convergence P/S shuts down. It sounds like my
convergence P/S is at fault. Does the green convergence circuit draw
less current because it is fixed (static)? I can get the convergence
P/S overnite but my customer is moving early tomorrow morning 3,000
miles away. It would be nice to get this P/S repaired. 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: Monday, October 20, 2003 12:50 PM
To: techassist@xxxxxxxxxxxxx
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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Other related posts:
- » [TechAssist] Re: FIXED UPDATE Re: RCA PTK195M26A, P46921,convergence problems
