rca ptk195ac

W

w wallace

Guest
when our tv gets warmed up like after about 15 min or so the picture
moves...it shrinks at the top and bottom and there are 3 images. the color
goes weird too like 3 colors stacked.the picture is concaved in the center.
does this sound like anything you have heard befor?and if so please help me
fix it...thanks!!!!
kathie wallace
 
Kathie ! Whats the Model Number .
Sounds like maybe Pincushion giving you trouble
or Convergence.

kip

--
"Watch the return E-Mail addy its false"
"w wallace" <whwallinc1@comcast.net> wrote in message
news:qEwXa.44798$cF.16943@rwcrnsc53...
when our tv gets warmed up like after about 15 min or so the picture
moves...it shrinks at the top and bottom and there are 3 images. the color
goes weird too like 3 colors stacked.the picture is concaved in the
center.
does this sound like anything you have heard befor?and if so please help
me
fix it...thanks!!!!
kathie wallace
Click to expand...
 
Convergence Power Supply, check for other posts in these n/g

"john" <va3mm@niagara.com> wrote in message
news:newscache$e4w3jh$2ag$1@newsfeed.niagara.com...
Kathie ! Whats the Model Number .
Sounds like maybe Pincushion giving you trouble
or Convergence.

kip

--
"Watch the return E-Mail addy its false"
"w wallace" <whwallinc1@comcast.net> wrote in message
news:qEwXa.44798$cF.16943@rwcrnsc53...
when our tv gets warmed up like after about 15 min or so the picture
moves...it shrinks at the top and bottom and there are 3 images. the
color
goes weird too like 3 colors stacked.the picture is concaved in the
center.
does this sound like anything you have heard befor?and if so please help
me
fix it...thanks!!!!
kathie wallace
Click to expand...
 
You need to troubleshoot and repair the convergence circuit.
Could be anything from a problem in the power supply to the
convergence processor circuit. A little bit of real troubleshooting
information is required to go any further.

I strongly suggest due to the complex nature of the convergence
circuit and its intermittent problems that you call in an experienced
technician with lots of experience with Thomson made units.

David

"w wallace" <whwallinc1@comcast.net> wrote in message news:<qEwXa.44798$cF.16943@rwcrnsc53>...
when our tv gets warmed up like after about 15 min or so the picture
moves...it shrinks at the top and bottom and there are 3 images. the color
goes weird too like 3 colors stacked.the picture is concaved in the center.
does this sound like anything you have heard befor?and if so please help me
fix it...thanks!!!!
kathie wallace
Click to expand...
 
Needs the convergence SMPS, they're dropping like flies.RCA has them on
national backorder but there is one place you can still get them. I forget the
name, but to my knowledge, from my parts guy, they had 60 in stock. I don't
think they will last too long.

I <u>think</u> the part number is 250686 for the new and improved SMPS, and it
is pretty different than the old one. There is no STK730, there is now an FET
and discreet circuitry. The place that has them is in Columbus and they got a
name like, well when you read it you want to ask, is that a typo ? They charge
a few dollars more than stock net, but they have them and they work.

JURB
 
I have a PTK195 from 1996 that had the convergance PSU failure and I got
away with replacing just the big ole STK on the board. Been running fine
about three months now. Real easy and real cheap.

Should I have replaced the entire PSU? Are other components soon to fail?

Thanks,
-Steve


"JURB6006" &lt;jurb6006@aol.com&gt; wrote in message
news:20030805193726.13370.00000090@mb-m27.aol.com...
Needs the convergence SMPS, they're dropping like flies.RCA has them on
national backorder but there is one place you can still get them. I forget
the
name, but to my knowledge, from my parts guy, they had 60 in stock. I
don't
think they will last too long.

I <u>think</u> the part number is 250686 for the new and improved SMPS,
and it
is pretty different than the old one. There is no STK730, there is now an
FET
and discreet circuitry. The place that has them is in Columbus and they
got a
name like, well when you read it you want to ask, is that a typo ? They
charge
a few dollars more than stock net, but they have them and they work.

JURB
Click to expand...

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.507 / Virus Database: 304 - Release Date: 8/4/2003
 
On 05 Aug 2003 23:37:26 GMT, jurb6006@aol.com (JURB6006) wrote:

Needs the convergence SMPS, they're dropping like flies.RCA has them on
national backorder but there is one place you can still get them. I forget the
name, but to my knowledge, from my parts guy, they had 60 in stock. I don't
think they will last too long.

I <u>think</u> the part number is 250686 for the new and improved SMPS, and it
is pretty different than the old one. There is no STK730, there is now an FET
and discreet circuitry. The place that has them is in Columbus and they got a
name like, well when you read it you want to ask, is that a typo ? They charge
a few dollars more than stock net, but they have them and they work.

JURB
Click to expand...
Rebuild them is expedient way to do to keep customers happy and cash
flowing.

Grand total cost of parts to replace is about 20 for about six to 8
little pieces. Compare that to big STK 730-xxx that costs 40. OUCH!!
Dig in and fix them up, not that diffcult, updated two diodes is what
is difference between blown ups one and updated conv. power boards
according to partfinder with latest parts database.

I'll get the parts info and post here.

I have done big bunch already and so far they're good. Right now I'm
rebuilding this one just before shop closed for the day and should
finish that tomorrow. Should take you about half a hour on each.

Those people who have this old power conv board w/ STK 730-xxx on it,
that's fine and bit inefficient SMPS and they had no heatsink grease.
Grease it while you are working on that set for any reason even SMPS
is working. Oh, I nag other co-workers and my boss to get service
model not just model ie:

P61939 is vague and there's multiple suffixes that has unique
redesigns over the time and can cause warrenty service payments
refused and wrong parts ordered.
P61939YX1 has older conv p-boards while P61939YX2 within serial ranges
is the ones with newer power boards has this flawed diode pair that
like to commit self-sucide and take p-board with it and may blow the
5A fuse.

This complete set of serial # and service model is important
especially for warrentry processing or parts ordering.
Bring a maganifying glass &amp; flashlight if you have problem reading
those fine prints on those model label.

It is good to build up number of rebuilt conv. p-boards on hand with
few fuses and have a tech head out with that kit and simply swap it
out and check fuse as necessary.

BTW: old and new conv. power boards are plug/electrically compatible.

Cheers,

Wizard
 
your right some of thoseSTK's are very expensive and nolonger available of
course. Also not able to find a cross reference either. Tought maybe you
might have the part numbers and the supplier that might have them in stock.

In reading your post you refered to a "P61939... and mine is model #
P60812BLLG2., chassis # PTK195AC.
Are we on the same sheet of music here?? Just checking.

would appreciate any further help you might have.

thanks,
Wes

"Jason D." &lt;jpero@sympatico.ca&gt; wrote in message
news:3f306080.10838442@news1.on.sympatico.ca...
On 05 Aug 2003 23:37:26 GMT, jurb6006@aol.com (JURB6006) wrote:

Needs the convergence SMPS, they're dropping like flies.RCA has them on
national backorder but there is one place you can still get them. I
forget the
name, but to my knowledge, from my parts guy, they had 60 in stock. I
don't
think they will last too long.

I <u>think</u> the part number is 250686 for the new and improved SMPS,
and it
is pretty different than the old one. There is no STK730, there is now an
FET
and discreet circuitry. The place that has them is in Columbus and they
got a
name like, well when you read it you want to ask, is that a typo ? They
charge
a few dollars more than stock net, but they have them and they work.

JURB

Rebuild them is expedient way to do to keep customers happy and cash
flowing.

Grand total cost of parts to replace is about 20 for about six to 8
little pieces. Compare that to big STK 730-xxx that costs 40. OUCH!!
Dig in and fix them up, not that diffcult, updated two diodes is what
is difference between blown ups one and updated conv. power boards
according to partfinder with latest parts database.

I'll get the parts info and post here.

I have done big bunch already and so far they're good. Right now I'm
rebuilding this one just before shop closed for the day and should
finish that tomorrow. Should take you about half a hour on each.

Those people who have this old power conv board w/ STK 730-xxx on it,
that's fine and bit inefficient SMPS and they had no heatsink grease.
Grease it while you are working on that set for any reason even SMPS
is working. Oh, I nag other co-workers and my boss to get service
model not just model ie:

P61939 is vague and there's multiple suffixes that has unique
redesigns over the time and can cause warrenty service payments
refused and wrong parts ordered.
P61939YX1 has older conv p-boards while P61939YX2 within serial ranges
is the ones with newer power boards has this flawed diode pair that
like to commit self-sucide and take p-board with it and may blow the
5A fuse.

This complete set of serial # and service model is important
especially for warrentry processing or parts ordering.
Bring a maganifying glass &amp; flashlight if you have problem reading
those fine prints on those model label.

It is good to build up number of rebuilt conv. p-boards on hand with
few fuses and have a tech head out with that kit and simply swap it
out and check fuse as necessary.

BTW: old and new conv. power boards are plug/electrically compatible.

Cheers,

Wizard
Click to expand...
 
On Wed, 06 Aug 2003 07:30:52 GMT, "w wallace" &lt;whwallinc1@comcast.net&gt;
wrote:

your right some of thoseSTK's are very expensive and nolonger available of
course. Also not able to find a cross reference either. Tought maybe you
might have the part numbers and the supplier that might have them in stock.
Click to expand...
Take a look,
http://www.iwaynet.net/~nesda/STK.html

Is the cross reference for these STK 730-xxx. You do happen to have
few in your scrap pile for suitable sub, exact part or upsize STK if
you don't have one on hand or is in rush. Otherwise, buy that newer
conv power-boards. These STK were all same except only for power
ratings, the regulation is done from seperate windings for feedback
only to the IC itself and voltages is set by number of windings on the
outputs. Power rating is sized accordingly to transformer core, and
insuring sufficent capacity by that IC and guage size on windings.

In reading your post you refered to a "P61939... and mine is model #
P60812BLLG2., chassis # PTK195AC.
Are we on the same sheet of music here?? Just checking.
Click to expand...
Hahaha... Actually the more to piece together complete info for sure
parts ordering is smaller sticker for the PTK195AC_x. The "x". I
show two kinds listed in partfinder for yours. _A or _A2.

Oh yeah, I remembered had to replace this IC same model STK 730-xxx
IC. Still can get them new IC from RCA or one of RCA's authorized
distributors.

The P61939YX1 used STK730 mounted on big Z shaped heatsink and had no
heatsink compound or thermal pad, YX2 used newer power boards w/ small
U shaped heatsink, basically same chassis with few minor differences.
The main plm was underrated diode pair only on newer power boards.

would appreciate any further help you might have.

thanks,
Wes
Click to expand...
Cheers,

Wizard
 
Was burning the midnight oil a little too long and not thinking on my last
post, trying to do three jobs at once, has my tv not only fried, but my
logical thinking too.

As have the STK730-130 on the "Z" shaped heatsink ( and of course no
compound). Checking further info on small label is as reads... PTK195AC
S 7402K2D..
and nothing further identifing asa " _A or _A2".

So if we updated the board... and maybe eliminate this problem board, would
you have one to sell, limited on time to spend on aquiring and rebuilding a
new board here (not enough hours in a day for me) or maybe direct me to a
source to find one? Or should I just bite the bullet and find a replacement
STK730-130 and stick it in? And will this help solve the problem for a
longer period of time? This OE lasted 6 years.

Thanks for your help Jason .

Wes




Watching movies on a 25" is not the same as on the 60".
"Jason D." &lt;jpero@sympatico.ca&gt; wrote in message
news:3f31d98c.23190938@news1.on.sympatico.ca...
On Wed, 06 Aug 2003 07:30:52 GMT, "w wallace" &lt;whwallinc1@comcast.net
wrote:

your right some of thoseSTK's are very expensive and nolonger available
of
course. Also not able to find a cross reference either. Tought maybe
you
might have the part numbers and the supplier that might have them in
stock.

Take a look,
http://www.iwaynet.net/~nesda/STK.html

Is the cross reference for these STK 730-xxx. You do happen to have
few in your scrap pile for suitable sub, exact part or upsize STK if
you don't have one on hand or is in rush. Otherwise, buy that newer
conv power-boards. These STK were all same except only for power
ratings, the regulation is done from seperate windings for feedback
only to the IC itself and voltages is set by number of windings on the
outputs. Power rating is sized accordingly to transformer core, and
insuring sufficent capacity by that IC and guage size on windings.


In reading your post you refered to a "P61939... and mine is model #
P60812BLLG2., chassis # PTK195AC.
Are we on the same sheet of music here?? Just checking.

Hahaha... Actually the more to piece together complete info for sure
parts ordering is smaller sticker for the PTK195AC_x. The "x". I
show two kinds listed in partfinder for yours. _A or _A2.

Oh yeah, I remembered had to replace this IC same model STK 730-xxx
IC. Still can get them new IC from RCA or one of RCA's authorized
distributors.

The P61939YX1 used STK730 mounted on big Z shaped heatsink and had no
heatsink compound or thermal pad, YX2 used newer power boards w/ small
U shaped heatsink, basically same chassis with few minor differences.
The main plm was underrated diode pair only on newer power boards.


would appreciate any further help you might have.

thanks,
Wes

Cheers,

Wizard
Click to expand...
 
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