Round 2 with the RCA PTK195 61": Page 5


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Round 2 with the RCA PTK195 61"

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Misfire
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Sep 16, 2015, 8:18 AM

Post #101 of 177 (5315 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00644.jpg

Ron.M
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Sep 16, 2015, 5:02 PM

Post #102 of 177 (5308 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Misfire;.....

Very good !!!
That's more like it...

One last thing to check...
IF you don't feel comfortable with this check , DO NOT do it...
Check for DC volts on pin #4 of U19700...
Use the negative side of C19702 for your "-" lead of your meter & the "+" on pin #4.....
Be careful as there are potentially dangerous volts in that area...
Please post the reading & the STK number of U19700..
(Want to make sure I have the right info)...

Thanks...

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

...
Veteran & Retired TV technician

Misfire
User

Sep 16, 2015, 9:38 PM

Post #103 of 177 (5296 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00645.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00649.jpg

jts1957
Veteran

Sep 16, 2015, 10:07 PM

Post #104 of 177 (5293 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Time to go shoppin'!

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Location: Far, Far Away

Misfire
User

Sep 17, 2015, 12:10 PM

Post #105 of 177 (5280 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Has the STK gone bad? I've already replaced it once, And I got the big 200 cap to discharge just messing around, that thing does go POW!

jts1957
Veteran

Sep 17, 2015, 12:41 PM

Post #106 of 177 (5277 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Sounds bad to me. See if Ron agrees.

Quote

I got the big 200 cap to discharge just messing around, that thing does go POW!

Good thing you no use your tongue. Tongue

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Location: Far, Far Away

Ron.M
Veteran

Sep 17, 2015, 5:59 PM

Post #107 of 177 (5268 views)
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Re: [jts1957 & Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Misfire;....

I agree with jts1957...
It looks like the STK has bit the dust again...

So start shopping for one...
When you have it installed , do NOT hook the power supply up to the convergence panel...
Read the output voltages at J19701 as before & post readings...

Later...Ron.M... Cool

...
Veteran & Retired TV technician

Misfire
User

Sep 19, 2015, 4:08 AM

Post #108 of 177 (5252 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

OK, new STK in place,,, this shows voltage in,,
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00651.jpg
And this shows voltage at pin 4 of STK,
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00653.jpg
Am I doing something wrong??

jts1957
Veteran

Sep 19, 2015, 5:06 AM

Post #109 of 177 (5248 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Were you monitoring Pin 4 as set was connected to AC and then turned on?

Check the 5 high value resistors:
For ease of measurement float either end of R19700 & R19722, then measure all 5:
R19700
R19701
R19702
R19703
R19722

IF they check OK, reconnect resistors.

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Location: Far, Far Away

Misfire
User

Sep 19, 2015, 6:21 PM

Post #110 of 177 (5238 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/CAM00656.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00654.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00660.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00661.jpg
http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00663.jpg

jts1957
Veteran

Sep 19, 2015, 7:44 PM

Post #111 of 177 (5233 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Now I'm really curious what's happening on pin 4 between the time you plug-in and turn the set on and the time you finally get your test leads connected?
In other words, find a way to have meter test leads connected so you can monitor pin 4 as set is turned on. Tack two short wires (a half inch piece of resistor lead) to ground and ANY convenient point that connects to pin 4 and connect alligator jumper leads between tacked "test stakes" and each meter lead (Red jumper between red meter test lead and pin 4 test stake / black jumper between black meter test lead and ground test stake.

R19714 is NOT open? (39 hundredth of one ohm)

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Location: Far, Far Away

Misfire
User

Sep 19, 2015, 10:44 PM

Post #112 of 177 (5227 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

one leg is lifted on resister
http://s776.photobucket.com/user/Misfire_photo/media/CAM00664.jpg.html
http://s776.photobucket.com/user/Misfire_photo/media/CAM00665.jpg.html?filters[user]=109979979&filters[recent]=1&sort=1&o=2
http://s776.photobucket.com/user/Misfire_photo/media/CAM00666.jpg.html?filters[user]=109979979&filters[recent]=1&sort=1&o=1
and whole lot nothin going on when power turned on,,, rainbow connector not used, just red and black AC from the board the flyback is on.

jts1957
Veteran

Sep 19, 2015, 11:35 PM

Post #113 of 177 (5222 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Do you have approx 145 Volts DC on IC19700 pins 11 & 12 (they are SAME point - let's not go through that again)?
Try plugging in rainbow connector, Convergence PS is supposed to be turned on via rectified filament on pin 3 of J19304.

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Location: Far, Far Away

Misfire
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Sep 20, 2015, 1:27 AM

Post #114 of 177 (5218 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/CAM00667.jpg
didn't hook up rainbow connector because I don't have approx. 145V,

jts1957
Veteran

Sep 20, 2015, 2:15 AM

Post #115 of 177 (5215 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Voltage may come down once IC starts running.
IC may start running once rainbow connected.

Let's see what Ron thinks.

Ron ...
Read page 25 Circuit Overview and see if I'm even in the ballpark.

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Location: Far, Far Away

Ron.M
Veteran

Sep 20, 2015, 7:29 PM

Post #116 of 177 (5200 views)
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Re: [jts1957 & Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

jts1957;....

Have a question;...

What does the "rainbow" refer to ???
We both may be in the ballpark , but this power supply is way out in left field..

He has NO +23 vdc on pin # 4 of J19701..
That voltage is coming from the flyback pin 8...
It also goes thru R14703 which he replaced before..
I'd start looking there for WHY there's NO +23 vdc on J19701...
I may be on a wild goose chase with that , but it seems to me that the +23 vdc is vital to turn the Conv PS on..
Re-check R14703 & make sure that it's STILL OK...

Misfire;...
Re-check R14703 & make sure that it's STILL OK & post results...
IF it's bad , replace it again...

PLUG J19304 into J19701 & read the voltages on that connector (J19701)...
Post ALL readings;=>..
Pin #1= ??
Pin #2=??
Pin #3 is chassis ground & should read 0.0 volts...
Pin #4 =??
Pin #5 = ??
Pin #6 = ??

Have fun...

Later...Ron.M... Cool

Veteran & Retired TV technician

(This post was edited by Ron.M on Sep 20, 2015, 8:04 PM)

jts1957
Veteran

Sep 20, 2015, 7:58 PM

Post #117 of 177 (5192 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Quote

Try plugging in rainbow connector, Convergence PS is supposed to be turned on via rectified filament on pin 3 of J19304.

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

Ron.M
Veteran

Sep 20, 2015, 8:07 PM

Post #118 of 177 (5186 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

jts1957;...

Quote

Try plugging in rainbow connector???..

STILL doesn't clarify WHAT the hell a "rainbow connector" is in an older RCA TV !!!
I though a "rainbow connector" has to do with the flat panel TVs...

OK , minor "brain fart" !!!
I edited post...
IF memory serves , he did not get any readings with those 2 connectors hooked up...

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

...
Veteran & Retired TV technician

(This post was edited by Ron.M on Sep 20, 2015, 8:13 PM)

jts1957
Veteran

Sep 20, 2015, 8:17 PM

Post #119 of 177 (5179 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Rainbow connector: http://s776.photobucket.com/...ia/CAM00640.jpg.html Connects convergence PS to convergence board.

Also observe that pins on connectors J19304 & J19701 are reversed from one to the other (Pin 3 is pin 4, Pin 1 is Pin 6, etc.) and there appears to be NO "P" connectors (at least not on schematic).

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Location: Far, Far Away

(This post was edited by jts1957 on Sep 20, 2015, 8:28 PM)

Ron.M
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Sep 20, 2015, 8:36 PM

Post #120 of 177 (5172 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

jts1957.....

OK...
Been quite awhile since I've worked on one of these sets & I called them wire cable assemblies...

Enjoy the rest of your Sunday...
I'm going to watch some football..

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

..
Veteran & Retired TV technician

Misfire
User

Sep 20, 2015, 10:17 PM

Post #121 of 177 (5166 views)
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Re: [Ron.M] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

just to clarify,,, recheck R14703? if good, plug in cables from CPS (convergence power supply) to board, turn on TV and observe voltages at the 6 wire plug? #3 being ground?

Ron.M
Veteran

Sep 21, 2015, 2:29 AM

Post #122 of 177 (5159 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Misfire;..

""recheck R14703? if good, plug in cables from CPS (convergence power supply) to board,""
Yes..
BTW:...
IF R14703 IS bad , it MUST be 3.0 OR 2.7 ohms @ 3 watts..

"" turn on TV and observe voltages at the 6 wire plug? ""
Yes..

#3 being ground?
I don't know IF the panel has the pin numbers for J19701 on the solder side the power supply panel...
On J19701 . pin 3 IS ground ("-")..
On the connector J19304 , pin 4 IS the ground...

Later..Ron.M... Cool

..
Veteran & Retired TV technician

(This post was edited by Ron.M on Sep 21, 2015, 2:35 AM)

jts1957
Veteran

Sep 21, 2015, 2:44 AM

Post #123 of 177 (5154 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

Just do the same as before when you made a test stake for HOT ground at C19702.
This time, Pin 11 AND Pin 12 of T19701 or any convenient point along that SAME trace would be ideal for a Cold ground test stake.

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Location: Far, Far Away

Misfire
User

Sep 21, 2015, 11:40 AM

Post #124 of 177 (5142 views)
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Re: [jts1957] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

confused, this is on the board the STK is on, <br>http://i776.photobucket.com/albums/yy45/Misfire_photo/CAM00670.jpg <br>I have no idea on pin 11 and 12 jts is referring to, can I use the pin with red arrow pointing to for ground? <br>
and the 3 watt 3 ohm resister I replaced is good,

(This post was edited by Misfire on Sep 21, 2015, 11:43 AM)

jts1957
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Sep 21, 2015, 1:40 PM

Post #125 of 177 (5138 views)
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Re: [Misfire] Round 2 with the RCA PTK195 61" [In reply to]	Can't Post

http://imgur.com/SreBh73

Notes:
Bottom (foil) view of circuit board
Blue = T19701
Green = Pins 11 & 12 of T19701
Red = J19701 Pin 3

ANY point on that thick black ground foil will work.

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

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