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Crumbtrail TV Forums: TV Equipment: Projection TV Forum:
Round 2 with the RCA PTK195 61"

 

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Misfire
User


Sep 21, 2015, 2:41 PM

Post #126 of 177 (4674 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

silly question?? why are there (+) signs on where I'm going to be using a ground?
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00675.jpg


jts1957
Veteran


Sep 21, 2015, 3:47 PM

Post #127 of 177 (4671 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

http://imgur.com/du4VNRS

J19701 has both positive and negative voltages.
Note the ground symbols with 'ZZ' - They are all the same cold ground.
Note the direction of the + symbol on the four circled electrolytic capacitors,
(Note the directions that the four rectifier diodes point.)


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Location: Far, Far Away


Misfire
User


Sep 22, 2015, 11:50 AM

Post #128 of 177 (4664 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00676.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00677.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00678_1.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00679.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00680.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00681.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00682.jpg
Think I had these V's all the time, That rainbow ribbon cable is bout piece of crap, altho? I don't know? whats next? still no convergence in menu.


jts1957
Veteran


Sep 22, 2015, 2:48 PM

Post #129 of 177 (4659 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Reinstalling STK #2 would prove that, but I'd suggest leaving well enough alone. Foils will start detaching from board sooner or later.Wink


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Location: Far, Far Away


Ron.M
Veteran


Sep 22, 2015, 5:30 PM

Post #130 of 177 (4653 views)
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Re: [jts1957 & Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

jts1957 & Misfire;.....

With the exception of the voltage at pin 1 being a bit low (-38 vdc instead of -45 as it should be ) I'd let this slide for now & check the Troubleshooting Guide in the manual..
On page 1-52 in my manual , there's a section called "Convergence Circuit Defective"...
The top box says;=>...
"No Convergence Correction"..
At the bottom of that page is a block that says;=>..
""5V at IC501 pins 2,4,5 etc""..
That would be IC19501 , which is on the Convergence Circuit Board....
Unless the 5V is missing you are going to have a nightmare to fix this problem....
I would hope that IS your problem !!!..

I'm having a problem getting a handle on this as to where to go...
What bothers me is WHY did R14703 blow out in the first place & WHY is the -45 vdc now reading at -38 vdc...
It might be a good idea to disconnect ALL the convergence yoke connectors fron the Convergence Circuit Board & see if the -38 vdc goes up...
IF it does , then it should be easy to find the cause...
(I HOPE !!!...Angelic)....


Later...Ron.M...Cool..
Veteran & Retired TV technician


Misfire
User


Sep 23, 2015, 2:31 AM

Post #131 of 177 (4645 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

well the voltage came up on pin one to 44.5v while messing around with this thing,,, I'm hearing a sizzeling sound from crt's,,, can unplug the conv connector one at time and it lightens up,,, goes away when all unplugged, can tap the board and it will change to a pulse sizzle sound, when all conv plugged in, I have the board all the way removed looking for maybe a bad connection or cold solder break, <br> oh yea, I cant find the IC19501


(This post was edited by Misfire on Sep 23, 2015, 2:33 AM)


jts1957
Veteran


Sep 23, 2015, 2:51 AM

Post #132 of 177 (4641 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

http://imgur.com/SB9INpW

Also look for any more coolant damaged areas.


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Location: Far, Far Away


Misfire
User


Sep 23, 2015, 4:15 PM

Post #133 of 177 (4631 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

I stand corrected,,, the sound or sizzle sound would be effected from tapping or slightly moving around the main board close to back side,,, I resoldered the fly-back coil and anything that looked obvious,, got the sound gone and went back to the original seen of the crime and resoldered anything that look like been infected from coolant,,, to no avail.
Hell, damn TV is working again and not making any buzzing or sizzeling sounds,, just the alignment is off,,, some of the letters in the menu from the red gun are little larger than green an blue side.
oh yea, once again to ask? would it be of any use to see what diag codes it might have to offer? and whats best way get them come up?


Misfire
User


Sep 23, 2015, 4:53 PM

Post #134 of 177 (4627 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

I poked around at the IC19501 chip a little, would these be considered the 5V you regard?
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00691.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00693.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00694.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00695.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00701.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00703.jpg


jts1957
Veteran


Sep 23, 2015, 5:30 PM

Post #135 of 177 (4622 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

You're going in to OBSERVE ... NOT to change!
In case you get the urge to tinker, even AFTER being warned that changing the WRONG PARAMETER's VALUE or even a once in 100 year spike on the power company line can result in a TOTALLY non-working TV...
NOTE: Before making any changes in the service adjustments its recommended to keep a record of the on set values.

SERVICE MENU
To access the service menu, turn the receiver on, press the menu button on
the front panel, and hold it down while pressing the power button. While
holding down the menu button, release the power button and press the
volume + button. The screen will display a one line menu, on the left the
parameter P0, and on the right the value of that parameter V0. Release
buttons.
Adjustments are made by selecting the proper parameter and
changing the value of that parameter. To change the parameter number use
channel up and down buttons. To adjust the current value of that parameter
use volume + and - buttons.
To access and change any of the adjustments,
the proper parameter pass number must be entered. SET TO 76
All service adjustments are bus controlled, except focus and screen.

ERROR CODES
If certain failures occur, the matching error codes will be stored in the
EEPROM. These error codes will be displayed in parameters 1, 2, and 3.
The first failure error code will be stored at parameter 1, and the second
failure error code in parameter 2. Parameter 3 will be updated to display the
most recent failure occurred in the chassis.


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 23, 2015, 5:33 PM)


Misfire
User


Sep 26, 2015, 1:02 AM

Post #136 of 177 (4600 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

All I can do is give you everything its brought up, don't really understand (level of codes) <br>p1 v16 <br>p6 v10 <br>p6 v8 <br>p7 v6 <br>p8 v4 <br>p9 v3 <br>p10 v29 <br>p11 v99 <br>p12 v 0 <br>p13 v79 <br>p14 v61 <br>p15 v79 <br>p16 v29 <br>p17 v32 <br>p18 v37 <br>p19 v22 <br>p20 v36 <br> missed one p4 10


(This post was edited by Misfire on Sep 26, 2015, 1:03 AM)


jts1957
Veteran


Sep 26, 2015, 3:41 AM

Post #137 of 177 (4596 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

If you're saying that pressing Vol until '76' is shown and then pressing CH once resulted in p1 ... then pressing CH once more brought up p6, then it appears that either some 'p's are MIA or maybe they chose to leave unused out. Btw, I'll assume the first p6 is actually p5. And that p4 actually appeared before p5.
Strange, but you insisted.


Quote
don't really understand (level of codes)

That's why we don't suggest customer accessing service menus.


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Location: Far, Far Away


Misfire
User


Sep 26, 2015, 7:17 AM

Post #138 of 177 (4587 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

lets try again,,
p1 v16
p2 v16
p3 v44
p4 v10
p5 v10
p6 v8
p7 v6
p8 v4
p9 v3
p10 v29
p11 v99
p12 v0
p13 v79
p14 v61
p15 v79
p16 v29
p17 v32
p18 v37
p19 v22
p20 v36
p21 v39
p22 v42
v23 v3


jts1957
Veteran


Sep 26, 2015, 8:47 AM

Post #139 of 177 (4584 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

p1 / p2 (Older) = Run IIC clock or data held low
p3 (Most Recent) = FPIP fails to acknowledge


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Location: Far, Far Away


Misfire
User


Sep 26, 2015, 3:34 PM

Post #140 of 177 (4575 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

1st question,, you guys must not think too much of the code info, because we are just now getting there?
2nd, Is this a convergence or a power supply problem? or does this fit in anywhere on the problem at hand?


jts1957
Veteran


Sep 26, 2015, 4:26 PM

Post #141 of 177 (4568 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

I'm saying just the opposite (Can't speak for Ron.). You are the one who insisted on checking the error codes out.
Well the 'Most Recently generated code' has something to do with Pix-in-Pix, The other 2 (plus whatever other codes that may have occurred and been overwritten in location 3) could possibly affect Digital convergence.

"Because only the last error location (03) is incremented upon each additional error, the error codes should all be reset to 0 upon completion of the service effort so that a three error code history will be available in the future. The error code numbers are changed just like the other alignment parameters."

Let's reset each error location (01 / 02 & 03) to zero, and recheck after set has been restarted a few times.


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 26, 2015, 4:29 PM)


Misfire
User


Sep 26, 2015, 5:14 PM

Post #142 of 177 (4565 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

I wouldn't say insisted on knowing,, I try to be as polite as possibly talking or asking questions to you guy's,, I have read other threads and seen how people come across to you guys and understand, You guys are still trying to help me so I must be doing something right Wink
Every time I'm finished testing on the TV, I unplug it, How long can it store codes or do I manually put (0) in for the p1,p2,p3 areas? And I almost hate to ask, but what is this?
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00704.jpg


jts1957
Veteran


Sep 26, 2015, 6:18 PM

Post #143 of 177 (4561 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post


Quote
"Because only the last error location (03) is incremented upon each additional error, the error codes should all be reset to 0 upon completion of the service effort so that a three error code history will be available in the future. The error code numbers are changed just like the other alignment parameters."

See post #135.

That is a test connector (?J19504? May say, but can't see in your pix.). V Sync, Clock & Data, if I recall correctly.


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 26, 2015, 6:19 PM)


Misfire
User


Sep 26, 2015, 11:45 PM

Post #144 of 177 (4556 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

you were close,, J19503, srry didn't have that in foto, I have turned p1,p2,p3 all back to zero and turned TV on/off a few times while letting it stay on, flip thru channels a few times, It has failed to set a code, while it was on, I let it run a good bit, question? should all the big aluminum fins on conv board be getting warm? I have 2 that are not.


jts1957
Veteran


Sep 27, 2015, 2:20 AM

Post #145 of 177 (4552 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post


Quote
should all the big aluminum fins on conv board be getting warm?


Like to like should be equivalent. Three have 4 transistors, two others have 2 transistors and one has 3 transistors.


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Location: Far, Far Away


Misfire
User


Sep 27, 2015, 4:04 AM

Post #146 of 177 (4548 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

so whats next step? seeing if the transisters are all getting power? or what do you recommend?


Misfire
User


Sep 27, 2015, 7:38 PM

Post #147 of 177 (4534 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

   Well I did find a wiring schematic with what voltage's should be, (http://diagramas.diagramasde.com/televisores/PTK195M.pdf
took awhile to find, when I have little more time I will go probing around it, I also kept finding on the (convergence not found in menu) insist it is the small power supply board and R19701,R19702,R19703 as well as CR19709,CR19710. I will just replace those and see what happens. any input is always appr, Aufweidersen,


jts1957
Veteran


Sep 27, 2015, 7:55 PM

Post #148 of 177 (4530 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Resistors were checked in posts 109/110.
Plus and minus 15 volt diodes, and you say you have these voltages.

Power Supply for convergence (PhotoFact Gold 9) differs from your set. NO STK. (PF Gold 18 would be closer)
Cr19709 doesn't exist; Cr19710 does.


Quote
seeing if the transisters are all getting power

Seemed like a reasonable course of action. Keep heat sinks from shorting to anything - they may not all be at ground potential.
They are mostly Darlington transistors, so may read a little different that regular ones.


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 27, 2015, 11:13 PM)


Misfire
User


Sep 28, 2015, 3:02 PM

Post #149 of 177 (4519 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

well not only said but proved with fotos on power supply board for convergence board,,, but had also read that the diodes I had mentioned would go open under load, guess not the case because power is getting to the convergence board to make 4 of 6 large aluminum fins warm, as far as probing voltages on the mosfet's or transistor's? I don't really know what I'm looking for? Some are 40V, some are 46V, 16V and 7V.
Being curious about the conv pow sup,, do you know what the max amp pull would be on that? I want to test it, just because it has V's dosnt mean it has the A,,,,


Ron.M
Veteran


Sep 28, 2015, 4:45 PM

Post #150 of 177 (4514 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

Misfire;.....


Quote
4 of 6 large aluminum fins warm,

You may have discovered something !!!..
How about posting the Reference numbers of the transistors/ICs on the "cool" heat sinks..
It may be worth checking into...

Later..Ron.M...Cool..
Veteran & Retired TV technician

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