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CTC167R Pincushion problem

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mel
Veteran

Mar 14, 2010, 10:14 PM

Post #26 of 47 (1848 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

Send me yout email address and i'll send you the schematic of the pincushion circuit.

Ron.M
Veteran

Mar 14, 2010, 10:52 PM

Post #27 of 47 (1840 views)
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Re: [mel] CTC167R Pincushion problem [In reply to]	Can't Post

Mel;....

Quote

Send me yout email address and i'll send you the schematic of the pincushion circuit.

IF you back up 3 posts to post # 24 & take a look at that GIGANTIC pix of a 27" GE with the purity problem , you'll see that he HAS the pincushion problem FIXED !!!!
I'm now trying to help him with the purity problem....
I know what it is , just not exactly where it's at on the board....

Thanks for trying to help.... Wink

....

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

.....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 14, 2010, 11:08 PM

Post #28 of 47 (1838 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

hmmmm. Somehow I just can't seem to remember having Alzheimers... Tongue

I need to know what section of the board you need to see to get better resolution pix.. Unsure

Yes, the vertical IC is the same as listed in the schematic

Ron.M
Veteran

Mar 15, 2010, 12:22 AM

Post #29 of 47 (1834 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

EXCELLENT PIX !!! ... THANK YOU !!!!

This is similar to what we're looking for;=>...
It's called a "Degaussing Thermistor"....

In your set it will be silver colored on both sides...(It's actually solder)...
It will be about 1/2 ~ 3/4 inch in diameter....
In the RCA/GE sets the wire will generally come loose at the area I marked in the pix below....

It will be in the area I took from your pix shown below;=>.....

IF memory serves (See , you're not the ONLY one with "memory lapses")
the thermistor should be hiding under that 15 watt oblong sandy colored resistor....
Dead center , bottom of my pix.....

One OR both of the wires may be separated from the thermistor....
They CAN be resoldered , however it is a bit of a trick to get it right...
IF done wrong , the center part splits & becomes useless...
Then it's time for a new one....

Set #2;=>...
When you get the cap , put it in & try the set....
My hopes are not that high that it will work....
You "may" need the IC also...
Check the rest of the voltages on IC551....
Please post results on both TVs...OK....THANKS..... Sly

....

Good Luck..... Laugh

.....

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

....
Veteran & Retired TV technician

(This post was edited by Ron.M on Mar 15, 2010, 12:27 AM)

Ron.M
Veteran

Mar 15, 2010, 12:40 AM

Post #30 of 47 (1826 views)
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buffalocomputer [In reply to]	Can't Post

buffalocomputer;...

PS;...

There's been many , many times that I found that the center part was gone & all that was left was 2 little skinny wires sticking up from the board.... Unsure

...
You "may" find that too on your set... Wink

....
Do not be suprised if all that there is is 2 skinny wires under that 15 watt resistor.... Smile

......

Good Luck...

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

....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 15, 2010, 12:58 AM

Post #31 of 47 (1824 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

BINGO! the thermistor >was< located next to the fuse, but is now in regions unknown. Will try to hunt one down when I hunt down that cap. Smile

Ron.M
Veteran

Mar 15, 2010, 2:36 AM

Post #32 of 47 (1818 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

2 pieces of info;.....

#1;=>...Not all degaussing thermistors are the same....
There are a lot of RCAs that are....
NOT a good idea to put just any one in....

#2;=>....Check under where the thermistor was connected for RP??101 or RT??101...
This insures you have the right part & gives you a way to do the following;=>...
Google it or , since Mel has the manual for this TV , ask him real nice &
polite like for the RCA part number...
He seems nice enough , he might do it...
Then Google it....

Good Luck....

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

....
Veteran & Retired TV technician

(This post was edited by Ron.M on Mar 15, 2010, 2:50 AM)

Ron.M
Veteran

Mar 15, 2010, 7:37 AM

Post #33 of 47 (1804 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

I believe the part number for the thermistor for RCA 27GT610 is.........207768.... Smile

....99.91% sure.....
Perhaps Mel would confirm OR correct ....OK....THANKS.... Sly

....

Good night..... Sly

.....

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

.....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 15, 2010, 11:36 PM

Post #34 of 47 (1798 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

LOL- just got home to find that the 47mfd is actually a 100 on this board... try again tomorrow..

I don't suppose I could temporarily short out the leads to the thermistor to coax the set into a quick degauss? I do like smoke and sparks :)

Ron.M
Veteran

Mar 16, 2010, 1:58 AM

Post #35 of 47 (1794 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

Well , that's the problem with having a similar schematic/service manual....

Quote

I don't suppose I could temporarily short out the leads to the thermistor to coax the set into a quick degauss? I do like smoke and sparks :)

Save the smoke & sparks for New Years Eve OR the 4th of July if you are in the USA...
I don't do hospital visits & definitely don't do funerals... Mad

....
So , NO don't do it !!!!... Unsure

....
You can cause damage....
Maybe even blow out that 15 watter !!!...
Just don't get too anxious & get the thermistor & cap , do it right.... Smile

.....
Patience , sir , patience.... Sly

.....

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

....

Veteran & Retired TV technician

buffalocomputer
New User

Mar 23, 2010, 12:13 AM

Post #36 of 47 (1781 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

Update: - The cap was not the problem, I have ordered the vertical IC

______________________________________________________

Can you confirm the part # for the thermistor?

The 207768 (according to Google) looks like a ceramic cap, not like the metal disc that was described.

Ron.M
Veteran

Mar 23, 2010, 1:10 AM

Post #37 of 47 (1778 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....
If you go to the link below;=>.....

http://www.partstore.com/...ersJan098RCA8Product

You'll see the part is listed as a Thermistor degaus....
Yes , it does look like a ceramic cap....But it's NOT......
I have one here & it's reddish in color & about 1/2 inch in diameter....
RCA discontinued making the originals due to this very problem....
IF you go across to where it says "See all models that use this part" click on that , model numbers pop up....
Where you see page #s , click on #10 , 14 , 18 , 22 , & finally #24....
There you will see model #27GT600 & 27GT612.....
It seems to me that the RCA 27GT610 fits right between those & the part # I gave you I'm STILL 99.91% sure.

Do NOT buy it from them , they want $9.95 + s&h.....
MCM has it for $5.34 + s&h....
Mcm=>...

http://www.mcmelectronics.com/...t/RCA-207768-/207768

If you shop around you might find it cheaper.....

Good Luck....

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

.....
Veteran & Retired TV technician

(This post was edited by Ron.M on Mar 23, 2010, 1:11 AM)

buffalocomputer
New User

Mar 29, 2010, 5:12 PM

Post #38 of 47 (1764 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

OK- The thermistor worked well -the color is 90% better, which is good enough for the kids to play games on. Thank you!

I installed the vert chip in the sylvania, an it looked great! Unfortunately, 2 of volume/channel controls on the front of the set were not centered, and I had to pull the chassis to adjust them. After re-inserting the chassis and re-powering, this is what I got:

I took a quick look for bad joints, but it looks good

Ron.M
Veteran

Mar 29, 2010, 6:08 PM

Post #39 of 47 (1758 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;.....

"""""OK- The thermistor worked well -the color is 90% better, which is good enough for the kids to play games on.""""
That should improve to 100% as you cycle the TV on & off a few times with breaks in between to allow the thermistor to cool down...
The TV was SO far out of purity that one cylcle could not do it all....
Give it some time & it should clear out the rest.... Wink

...

As to the Sylvania:....
You need to check ALL the wiring going to the CRT module EXCEPT the focus lead...
See page 32 pdf # (or 7-10 manual page #) upper right corner in the service manual (W-3 area on schematic)....
Chech the +200 vdc supply & make sure it's ~+200 vdc there....
Also check for the +8 vdc on the other connector....
Check for bad solder connections on the CRT module & the FLYBACK....
The +200 vdc comes from the flyback thru a diode...
PLEASE post back with results....THANK you.... Sly

.....

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

.....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 29, 2010, 9:58 PM

Post #40 of 47 (1752 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

+200 is at 197, +8 is 7.8 or so.

currently checking closer for cold/broken joints.

By checking wires, I assume you mean for continuity/ohms?

Ron.M
Veteran

Mar 29, 2010, 10:08 PM

Post #41 of 47 (1751 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

""""By checking wires, I assume you mean for continuity/ohms?""""
You can do that too , if you want to...
I was primarily interested to make sure they are connected/seated properly....

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

.....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 29, 2010, 10:19 PM

Post #42 of 47 (1749 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

+200 VDC - 198.5 +8 VDC - 7.9 R,G,B 1.5 Screen - 80v Heater - 0 

Re-flowed flyback connections

Solder on the heatsinks were cracked

(This post was edited by buffalocomputer on Mar 29, 2010, 10:21 PM)

Ron.M
Veteran

Mar 29, 2010, 10:42 PM

Post #43 of 47 (1745 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

You didn't say what the results are !!!...

& I don't know how you are doing this;=>... 

Please try to stop it , as in larger posts , it makes them harder to read.... Unsure

...
I don't know what means anyways.... Laugh

....

THANKS.... Smile

.....

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

....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 29, 2010, 10:53 PM

Post #44 of 47 (1740 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

That is XML language.. I don't know how it got on there. Showed up after I added an edit [mad] - it stands for line break or newline

try this again-
Screen - 80v
R, G, B -1.5v
200 vdc - 198v
Heater - 0v
8 vdc - 7.9v

Ron.M
Veteran

Mar 29, 2010, 11:22 PM

Post #45 of 47 (1737 views)
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Re: [buffalocomputer] Sylvania TV... [In reply to]	Can't Post

buffalocomputer;......

Those readings look OK....
The heater WILL read 0v because it's high requency AC from the Flyback...
Do not worry , it's there or you wouldn't have briteness....
BUT , I'm NOT sure about the screen voltage...
The screen adjust is on the flyback....
There are 2 adjustments on the Flyback...
The top one is for focus....
The bottom one is for screen...
Before you adjust it , check & make sure the control is NOT damaged....
Could've happened when you reset the main board....
IF it's OK , turn the screen control CCW...
It should get darker & the lines should diminish as you turn it further...
You should also see video coming in....
If you don't see any change , read the voltage while adjusting the control & see if the voltage changes accordingly...

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

...
Veteran & Retired TV technician

buffalocomputer
New User

Mar 29, 2010, 11:53 PM

Post #46 of 47 (1736 views)
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Re: [Ron.M] Sylvania TV... [In reply to]	Can't Post

I did some subtle adjustments to the flyback and the with and B+ pots on the board and got this:

The problem I see (or do not see) is that there is no sound at all, and no hint of any input. The screen does not change with cable hooked or unhooked, and the channel find finds nothing...

Ron.M
Veteran

Mar 30, 2010, 12:16 AM

Post #47 of 47 (1733 views)
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Re: [buffalocomputer] Sylvania TV... [In reply to]	Can't Post

buffalocomputer;.....

I feel like we're playing "Pong"....
1st;....What happened here;=>
"""If you don't see any change , read the voltage while adjusting the control & see if the voltage changes accordingly"""...
What readings did you get ????

"""I did some subtle adjustments to the flyback and the with and B+ pots on the board and got this""""
WHAT B+ pots did you mess with ???? ...NEED SPECIFIC info.....

Check on the bottom side of the board for any dinged connections , scratched areas , bent wires from components (caps , resistors , ICs , etc) or ANY signs of damage....

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

....
Veteran & Retired TV technician

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