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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


Aug 3, 2015, 2:41 AM

Post #1 of 177 (6995 views)
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Round 2 with the RCA PTK195 61" Can't Post

   Really want to thank the guys for the help on first round,,, So everything had been just dandy till the other day, was wanting show it off,,,, I don't really watch tv much, And the screen did this when turned on,,, any ideas?
[URL=http://s776.photobucket.com/user/Misfire_photo/media/CAM00410.jpg.html]


(This post was edited by Misfire on Aug 3, 2015, 2:48 AM)



Misfire
User


Aug 3, 2015, 3:02 PM

Post #2 of 177 (6983 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

And want to add that it is only the red gun that is causing this,


Ron.M
Veteran


Aug 7, 2015, 7:13 PM

Post #3 of 177 (6938 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

Misfire;....

The RCA PTK 195 chassis can be a NIGHTMARE to service...
I'll try to help you...
Right off the top , there are 2 possibilities that come to mind...
1)..
The red yoke slid down the neck of the red CRT...
2)..
You have a problem in the red convergence circuitry...
Could be in the power supply or the red convergence transistors...

A model number may help...
Getting a service manual for the PTK195 is a BITCH
There are 2 completely different versions of the convergence circuitry for the PTK195 chassis series..
And I could NOT find one of them...Mad....

How much TV/Electronic repair experience do you have ???

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


jts1957
Veteran


Aug 7, 2015, 7:19 PM

Post #4 of 177 (6935 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

SAME set as before: http://www.tv-forums.com/...search_engine#158113


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Location: Far, Far Away


Misfire
User


Aug 8, 2015, 1:28 PM

Post #5 of 177 (6929 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Hey guy's, yup, me again,,, Thinking this might be it for the ole gal unless you guys think its worth messing with, I had switched the small elec board from the red gun to the blue gun and vice versa, and changed the jumper wire accordingly, everything was hooked back up,,, I was just looking for a change or a difference, the one in the foto was replaced because of TV coolant gotten on it from red gun earlier,
When I powered the set up, the resister in the yellow circle started glowing red as hell and set didn't come on, So I don't know now, the little boards on bottem of guns all have same part number other than the jumper wire location which I switched, I wouldn't think that would have done it?
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00563.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00561.jpg


Ron.M
Veteran


Aug 8, 2015, 7:01 PM

Post #6 of 177 (6918 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Misfire;...

I'll be back as soon as I can find the manual that I got from jts1957..
.
Thanks...

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

(This post was edited by Ron.M on Aug 8, 2015, 9:47 PM)


jts1957
Veteran


Aug 8, 2015, 7:46 PM

Post #7 of 177 (6914 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

B= JW256
R= JW258
G= JW257

R14703 Filament 3.0 (2.7) 3W


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Location: Far, Far Away


Ron.M
Veteran


Aug 8, 2015, 8:16 PM

Post #8 of 177 (6908 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

jts1957;....

Thanks again for the service manual location...
Got the manual again...
Thanks for the jumper & resistor info...

Misfire;...
I downloaded a 19 part manual that I have to put together into one gigantic service manual...
As soon as I do that & look thru it , I'll be back...


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

(This post was edited by Ron.M on Aug 8, 2015, 9:33 PM)


jts1957
Veteran


Aug 8, 2015, 8:35 PM

Post #9 of 177 (6904 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Ron, I'm NOT having an IMAX issue (a Kodak moment maybe).


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Location: Far, Far Away


Ron.M
Veteran


Aug 8, 2015, 9:43 PM

Post #10 of 177 (6892 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 
jts1957;...

Chalk that one up to the gremlins again !!!!..

I swear it was when I made that post...
Now that I came back , it looks OK...
BTW...
I only have one way to post...
I do NOT have the choice between "Advanced Editor" or "Basic Editor" modes...


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


Misfire
User


Aug 9, 2015, 12:14 AM

Post #11 of 177 (6887 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

sense it was working from last time, I watched a few videos from you-tube from my lap-top using this digital to analog conversion thing,,, would that maybe have an impact on anything?
http://i776.photobucket.com/albums/yy45/Misfire_photo/IMG_20150808_200203.jpg


jts1957
Veteran


Aug 9, 2015, 3:38 AM

Post #12 of 177 (6883 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Edit Profile ...
Post writer/editor: 'Advanced' or 'Basic' editor drop down box
Note: The advanced editor required Internet Explorer version 5.5 or greater

Misfire: Nah.


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Location: Far, Far Away

(This post was edited by jts1957 on Aug 9, 2015, 3:39 AM)


Ron.M
Veteran


Aug 9, 2015, 4:31 PM

Post #13 of 177 (6870 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

jts1957;....


Quote
Edit Profile

Do you mean "my" Personal Profile ???
Because 'Advanced' or 'Basic' editor is NOT shown at the reply box as it was...

I have the new Windows 8.1 with Internet Explorer 10 , so that should cover it , but , it doesn't...




Misfire;...
Double Nah !!!...

Now back to the TV;...

On the yokes there are 2 sets of wires...
Both will have 4 wires each...
One set should have a red , blue , yellow & a green wire...(Usually)..
That set is for Horiz & vertical deflection & IS NOT the set we want...
The set we want will have thinner wires..
That set is for the convergence...
The thinner wires on the red yoke will go to the convergence board...
There are 3 connectors running along the left side of the panel , I believe...
The bottom connector should be "J19301" & is the connector for the red yoke..
UNPLUG the wiring that goes to that connector...
The center one , "J19302" , is for the green yoke...
Disconnect that one & PLUG the red connector into the green connection..
Plug the wires that go to the green yoke into the red connection...
Essentially what we are doing here is switching convergence circuits from the red & green to see what gives..
Turn on the TV ...
Do not worry about the convergence being out of kilter, it will be !!...
What we want to know is IF the previous red box that you had before is STILL red or did it change to green..
Please post results...

THANKS...

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

(This post was edited by Ron.M on Aug 12, 2015, 5:48 PM)


Misfire
User


Aug 10, 2015, 3:15 PM

Post #14 of 177 (6844 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Hey Ron,, I had tried something similar to that earlier with the small circuit boards that mount on bottem of guns, and put jumper wires in appropriate location for color, I swapped the red with blue gun board and turned on set and this resister was glowing red as hell,,, now set will not come on.
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00561.jpg


Ron.M
Veteran


Aug 10, 2015, 5:01 PM

Post #15 of 177 (6837 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Misfire;....



Quote
Hey Ron,, I had tried something similar to that earlier with the small circuit boards that mount on bottem of guns


NO , NO , NOOOOO , you DIDN't !!!....
Those boards are for CRT drive , video to the CRT , focus , ETC & have NOTHING,I repeat , NOTHING to do with the convergence test that I asked for...


Quote
I swapped the red with blue gun board and turned on set and this resister was glowing red as hell,,

Swapping those 2 boards accomplished NOTHING as you found out the hard way...


Quote
turned on set and this resister was glowing red as hell,,,

Did you replace that resistor with an EXACT replacement ???..

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


jts1957
Veteran


Aug 10, 2015, 5:09 PM

Post #16 of 177 (6835 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

First three jumpers determines the color drive that is fed to each CRT cathode. Necessary for a working set to have ONLY one of each color. Since all three CRTs are the same, usually just swapping whole boards (if wire length adequate) is sufficient for testing.


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Location: Far, Far Away


Misfire
User


Aug 10, 2015, 5:55 PM

Post #17 of 177 (6832 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

No sir, not replaced anything, just swapped the red gun board with blue gun board prior to your instruction's on swapping the plug in leads on convergence board,,, would that have caused the resister to glow?


jts1957
Veteran


Aug 10, 2015, 6:04 PM

Post #18 of 177 (6829 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post


Quote
would that have caused the resister to glow?

Nah also.


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Location: Far, Far Away


Misfire
User


Aug 11, 2015, 9:44 AM

Post #19 of 177 (6827 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

well I guess I can forget about the red cone I had in the screen and try to focus on why the set wont come on now,
from that resister glow? would you say it went bad or something down stream caused it to burn out?


Ron.M
Veteran


Aug 11, 2015, 5:10 PM

Post #20 of 177 (6818 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

Misfire;...

The reason the set may not be coming on COULD be due to the resistor that you said is fried !!!
That being R14703 !!!
EDIT;...REMOVE ALL 3 CRT panels from the bottom of the CRTs...
Then;=>..
Unsolder one end of that resistor to isolate it from the circuit...
Use your handy-dandy DVM to read ohms & check & see what you get across the leads...
Chances are that it's bad..
THEN check ohms to chassis ground (Tuner cover is a good place for chassis ground) on EACH side of R14703...
You should get a very low reading on one side & a higher reading on the other...
PLEASE POST READINGS !!!...
AFTER YOU POST THE READINGS:..
IF resistor reads bad;...
Try replacing that with a 3 WATT 3 or 2.7 ohm flameproof resistor...

PLEASE post results & lets stay on course...


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

(This post was edited by Ron.M on Aug 11, 2015, 7:49 PM)


jts1957
Veteran


Aug 11, 2015, 5:23 PM

Post #21 of 177 (6810 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post


Quote
THEN check ohms to chassis ground (Tuner cover is a good place for chassis ground) on EACH side of R14703...
You should get a very low reading on one side & a higher reading on the other...

CRT filament on one side ... flyback transformer winding on other. I suspect there won't be very much of a difference.


-------------------------
Location: Far, Far Away

(This post was edited by jts1957 on Aug 11, 2015, 5:24 PM)


Ron.M
Veteran


Aug 11, 2015, 7:44 PM

Post #22 of 177 (6805 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

jts1957;....


Quote
CRT filament on one side ... flyback transformer winding on other. I suspect there won't be very much of a difference.

You'd think that in a "normal" schematic !!!
I traced out the filament line all over the SM & could NOT find where it connects to the R , G & B CRT filaments...
Off the flyback , one line runs to xrp (?) etc (342-D) , a second line goes thru R14703 to a connector at 322-D , another line breaks off there to CR19200 & splits off to conv 381-F !!!

A person can get dizzy chasing lines around this manual...

I'm going to edit my previous post & see IF that helps...

Thanks jts1957...


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


Misfire
User


Aug 16, 2015, 9:40 AM

Post #23 of 177 (6663 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

all reading are on the 200 ohm scale,,, also tried the 20Mohm on the no reading one.
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00573.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00576.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00577.jpg


Ron.M
Veteran


Aug 16, 2015, 4:26 PM

Post #24 of 177 (6657 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

 

Misfire;.....

THANKS for the pix with the readings...

55.7 ohms means R14703 DEFINITELY BAD !!!!
0.03 ohms to apparently chassis ground means that the winding on the flyback apparently good...
1 . indicates no shorts on the line to other circuits that are fed thru R14703...
I STRONGLY suggest you get a 3.0 OR 2.7 ohm 3 watt flameproof resistor & install it..
With ALL the CRT panels OFF the CRTs , turn the TV on..
Observe R14703 & see if it smokes or turns red..
IF it does , STOP & post back here..
IF OK , connect the green & blue CRT panels back onto their respective CRTs...
Again turn the TV on & watch R14703...
IF OK , connect the red CRT panel onto the red CRT..
Observe R14703 & see if it smokes or turns red..
IF it does , STOP & post back here..
When you do this PLEASE post back with the results & we should have the red square back to tackle...

THANKS...

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

(This post was edited by Ron.M on Aug 16, 2015, 4:38 PM)


Misfire
User


Aug 19, 2015, 10:17 AM

Post #25 of 177 (6609 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to] Can't Post

Did everything you said step by step and we are back to square one with the red cone just like the first picture in thread,,, whew, whats next?

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