PTK195


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pocketwatch62
New User

Feb 6, 2012, 7:59 PM

Post #1 of 17 (2608 views)
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PTK195	Can't Post

Hello All!
I have a ptk195 model# P52955.
Had to replace the flyback, and now
i don't have convergence in the menu anymore.
Does any one know what could have happened and why?
Thanks For the replys.

Ron.M
Veteran

Feb 6, 2012, 10:05 PM

Post #2 of 17 (2600 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;....

I have to ask the following;....
Since youy already replaced the flyback , how much experience in TV repair do you have ????
I could not find a free service manual for your TV...
However...
How does the convergence look onscreen ???...
I found a user manual that is close to what you set is....
On page 35 it shows the menu for "Screen"
Item #6 on the menu page says "Adjust Proijection TV"...
Do you get that page in your menu ???

Please post back with your findings;....THANKS... Smile

...

Have a GREAT day & week.... Sly

...

Later...Ron.M.... Cool

...
Veteran & Retired TV technician

pocketwatch62
New User

Feb 7, 2012, 2:30 PM

Post #3 of 17 (2592 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

Thank You Sir for the reply,
I've fixed a few TV's, But i'm not a "TV Repair Man"
I have nothing in the user menu about Adjust Projection,
Convergence of nothing. It used to be there but not now.
It does not come up now with V80 in the service menu.
I have 2 convergence PSB it does the same with both boards.
the picture looks fair, but it still adjusting a little,
especially the blue.
Thank You Sir,

Ron.M
Veteran

Feb 7, 2012, 7:05 PM

Post #4 of 17 (2581 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;.....

I've had NO luck in finding a service manual for your TV...
I have several manuals for the PTK195 chassis & none of them show a "V80" in the service menu...
Are you getting the "Screen" page in your customer menu ???
Do you have the exact service manual for your TV & would you be willing to send it to me ???
Did you replace the flyback with an EXACT replacement or did you/they sub it ???..<<.Important info...
"PSB" refers to Power Supply Board , right ???...Just confirming...
Was there any snapping or popping when the flyback went out ???

THANKS.... Smile

.....

Later...Ron.M.... Cool

....
Veteran & Retired TV technician

(This post was edited by Ron.M on Feb 7, 2012, 7:08 PM)

pocketwatch62
New User

Feb 8, 2012, 2:47 PM

Post #5 of 17 (2566 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

Thank You Sir,
I am getting the screen option in the user menu, but convergence is
not there any more. I do not have the service manuel. I found this online
"Entering the Service Mode Using the Front Panel Controls
1. Press and release the POWER button to turn the
instrument on.
2. Press and hold the MENU button.
a. Press and release the POWER button.
b. Press and release the VOL+ button.
3. Release the MENU button.
The instrument will display the following menu:
The CH � and CH � buttons on the front panel (or the
remote transmitter) are used to change the parameter (P)
number. The VOL + and VOL - buttons are used to change the
parameter value (V).
NOTE: Attempting to change the parameter number (using
CH � or CH �) at this point will cause the instrument
to exit the service mode. A valid security code must
be entered (using VOL + or VOL -) before selecting
an alignment parameter.
Security Codes
When the service mode is first turned on, the parameter will
be "0", which does not correspond to an alignment. This is the
security code parameter, the purpose of which is to prevent
accidental entry into the parameter groups. The value (V)
must be set to 76 for Front panel access to chassis
alignments. The value (V) must be set to 80 for Front panel
(remote control) convergence adjustments"
The flyback was a replacement (239111)
A few pops and that was it, It also took out the HOT.
Yes PSB refers to power supply board.
Thanks

zip
User

Feb 8, 2012, 7:56 PM

Post #6 of 17 (2555 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

Check your power supply for the convergence circuit,you have lost your
convergence supply voltage and when the tv set is turned on and it goes
thru the boot up, it does'nt find the convergence circuit and removes it from
the menu screen, (for tv's that don't have convergence in them) so you need
to find the problem with the no power issue and the menu will return, it is
(the voltage) feed- via the flyback transformer. Could be bad solder joint or a wire
left unplugged ect.

Ron.M
Veteran

Feb 8, 2012, 8:08 PM

Post #7 of 17 (2554 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;.....

Found a slew of info on your problem..
You will need a DMM to check volts & ohms...
Check this out 1st;=>....
http://www.tv-forums.com/...cgi?post=93690#93690
Check the volts at connector P/J19701....
They must read what the list says...

Then check these out;=>....

Quote

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\

The above is from;=>...
http://www.riddledtv.com/...s-ptk195mt-t366.html

I realize you changed the PSB 2x...
It's possible they are both bad...
PLEASE check R19703 as that part comes up often as a problem...

Another tip;=>....

Quote

Make:RCA
Model:P52810LVG2
Chassis:PTK195AB
Problem:Convergence Problem, no digicon communication between main board and convergence board, bank of heat sinks on convergence board, stone cold
Solution:Replace STK730-130, NTE cross, NTE7125, problem solved. You may have to get into the codes to adjust set.

Compliments of slinteriors (A semi-active contributer here also) at;=>....
http://tvrepairassistance.lefora.com/...h-convergence-issue/

That's enough for starters...
PLEASE post results & findings....THANKS.... Sly

...

Have fun.... Wink

....

Later...Ron.M..... Cool

.....
Veteran & Retired TV technician

pocketwatch62
New User

Feb 10, 2012, 2:39 PM

Post #8 of 17 (2533 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

Thank you Guys,
First of I have 119Vac on J/P19700.
Second, I have no volts on P/J19701.
Again it's the same with both boards, Strange thing is that the
heatsink gets warm , (But not hot) on both boards. Those resisitors and diodes
seem to be ok.Just don't think the same problem with both boards, but possible.
The tv make no difference with the convergence PSB on or off.
Could the STK730-130 keep the boards from having any output voltages?
Thanks Guys

Ron.M
Veteran

Feb 10, 2012, 8:41 PM

Post #9 of 17 (2520 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;....

Quote

Could the STK730-130 keep the boards from having any output voltages?

YES !!!! & More than likely the cause...
Common problem...
But , first , lets make sure....OK ???

Quote

Second, I have no volts on P/J19701.

UNLESS you are reading the volts wrong ,
That's why you have the convergence problem....
Turn the TV on & please check the voltages on U19700 (STK730-130)...
These voltages must be read from "Hot" ground...
PLEASE use care so you do NOT short pins together with your meter probe...
Can be hazardous to your health OR the TVs... Unsure

...
Hook your negative meter probe to the minus side of C19702...
That is a large 220 mfd lytic @ 200 vdc coming off the 4 diodes from the AC line...
Use care when connecting your meter there as when the set is plugged in you can get a dandy shock & meet all your dead friends & relatives.... Wink

...
Turn the TV on & please check the following voltages on U19700 (STK730-130)...

Pin #1=-40 vdc
Pin #2=-33.2 vdc
Pin #3=0.0 vdc (Hot ground)...
Pin #4=+1.6 vdc
Pin #5=+1.6 vdc
Pin #6=+1.4 vdc
Pin #7=+.03 vdc ( For all practical purposes 0.0 vdc)
Pin #8=+.08 vdc (^^)
Pin #9=+.08 vdc (^^)
Pin #10=No connection
Pin #11=+157 vdc
Pin #12=+157 vdc

Please note that those are approximate & your voltages may vary slightly ......
Then look for connector J19105....
It will be in a cluster of 7 connectors near a corner of the convergence output board...
Near J19105 should be a diode CR19200...
One end comes from the flyback , the other end supplies 22 vdc to turn on the power supply...
Connect the negative probe of your meter to chassis ground (The coax connector on the tuner is ideal) & the positive probe of your meter to the band end of the diode...
You should get ~+22 vdc...
Post results.....

Quote

Strange thing is that the
heatsink gets warm , (But not hot) on both boards.

Could be bad ICs...Not saying they are...

Quote

Just don't think the same problem with both boards, but possible.

You have a missing voltage & we have to find out where it's at...
PLEASE post your results.....THANKS.... Sly

...

Have fun.... Wink

....

Later...Ron.M.... Cool

...
Veteran & Retired TV technician

pocketwatch62
New User

Feb 14, 2012, 2:34 AM

Post #10 of 17 (2494 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

sorry sir for the delay,
on the STK730-130 i have the following
pin1 -40volts
pin2 -33volts
pin4 +1.4volts
pin5 +1.4volts
pin6 +1.2volts
pin7 0volts
pin8 .038volts
pin9 .038volts
pin11 the meter bounces around with tv on, But 155volts with off
pin12 the meter bounces around with tv on, But 155volts with off.
from -side of the c19702.
i guess i was checking wrong.
everything seems ok but the bouncing around of the meter on pin 11 and 12 of stk730-130 with the tv on.
Thank You Sir,
any more ideals?
i have 23volts on the cathode end of cr19200 to cold tuner ground.

pocketwatch62
New User

Feb 14, 2012, 2:49 AM

Post #11 of 17 (2490 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

Also Ron,
All six heat sinks on the convergence board are ice cold.
I assume that is not normal.
Thank You Sir,
I appreciate you Time

Ron.M
Veteran

Feb 14, 2012, 7:56 PM

Post #12 of 17 (2471 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;.....

Nice work...THANKS.... Smile

...

Quote

All six heat sinks on the convergence board are ice cold.
I assume that is not normal.

NO , it's not...Should be warm , at least , after the set's been on for awhile....

Not sure that the volts on pins #11 & 12 should be bouncing around like that....
Let's experiment a bit....
Unplug the connector at J19106 on the convergence power supply board & re-check the volts on pins #11 &12 ...(TV on)
See if they are more stable & not bouncing around...
Also with J19106 unplugged , please take readings from the pins (All 14 pins) on the board connector...
Use the tuner coax connector as ground...
Use care not to short pins together while you do that...
When you are done , please post results......THANKS.... Sly

....

Later...Ron.M.... Cool

....
Veteran & Retired TV technician

Ron.M
Veteran

Feb 15, 2012, 8:18 PM

Post #13 of 17 (2459 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

pocketwatch62;...

Made a big "boo boo" here....

Concerns;=>...

Quote

Use the tuner coax connector as ground...

Ole brain had a fart...
With J19106 unplugged , you have also unplugged the ground connections to the chassis & your readings should be nil on all pins....
Instead of using the tuner coax as ground , use either pin 11 or 12 on the transformer T19701...
Then your readings should be accurate...
SORRY about that.... Unsure

...
Thanks.... Sly

....

Later...Ron.M.... Cool

...
Veteran & Retired TV technician

(This post was edited by Ron.M on Feb 15, 2012, 8:20 PM)

pocketwatch62
New User

Feb 16, 2012, 7:58 PM

Post #14 of 17 (2445 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

Not a problem Sir,
I found the problem,
It was pin #3 on J19503 (Clock and Data Connector)
The solder was cracked. Resoldered and got the
"Adjust Projection TV" Menu back.
I want to THANK YOU for your Time.
"And patience" with me. I've learned a lot from you.
It's always good to learn from the best.
Again Thank You Sir, I will keep in touch.
Pocketwatch62

Ron.M
Veteran

Feb 16, 2012, 8:19 PM

Post #15 of 17 (2439 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;.....

You're MOST Welcome....
Don't know what I did to help , but , it's always nice to be appreciated...

GLAD you found the problem...
Who'd have thunk it was a clock line connection & how you managed to find that needle in a giant haystack....

Quote

Second, I have no volts on P/J19701.

Got thrown off track by that little piece of misinfo.....

Congratulations & enjoy the TV....

Have a GREAT day & weekend.... Sly

....

Later...Ron.M.... Cool

....
Veteran & Retired TV technician

pocketwatch62
New User

Feb 29, 2012, 2:48 PM

Post #16 of 17 (2339 views)
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Re: [Ron.M] PTK195 [In reply to]	Can't Post

Good Morning Sir,
It's me again,
Sorry to bother you. Got another problem.
Oh it's a PTK195
Model # P52955
When in convergence the blue will align just fine, But when in red convergence
the Green moves. Have you seen this before?
Thank You Sir, for your reply.

Ron.M
Veteran

Feb 29, 2012, 11:47 PM

Post #17 of 17 (2319 views)
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Re: [pocketwatch62] PTK195 [In reply to]	Can't Post

pocketwatch62;.....

Now that the spammers appear to be gone ......

Quote

When in convergence the blue will align just fine, But when in red convergence
the Green moves. Have you seen this before?
Thank You Sir, for your reply.

Check the convergence wires that go to the Green yoke & the Red yoke & reverse them...
These will be relatively thin wires (4 each)..
The heavier wires are for deflection & do NOT need to be switched & will NOT fix the problem....
The connectors should be the same , so there should be no problem switching them...

Have a GREAT day & week...

Later...Ron.M... Cool

...
Veteran & Retired TV technician

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