CTC167R Pincushion problem


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CTC167R Pincushion problem

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buffalocomputer
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Mar 11, 2010, 1:37 PM

Post #1 of 47 (6492 views)
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CTC167R Pincushion problem	Can't Post

Picture has an hourglass that extends 3 inches at the center

I have checked CR 401,403,404
All caps in the '400' section look good

Any suggestions? I do not have a schematic.

Thanks in advance!

Ron.M
Veteran

Mar 11, 2010, 7:39 PM

Post #2 of 47 (6486 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....
I do not have a schematic either...& to my chagrin , my CTC169 is corrupted !!!.... Mad

...
However , if memory serves , there's a 820 mfd , 200 vdc cap that comes off the power supply bridge that when it goes bad will give you an extreme hour glass pix....
It'll be a large can....

GOOD LUCK....

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

.....
Veteran & Retired TV technician

buffalocomputer
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Mar 11, 2010, 9:36 PM

Post #3 of 47 (6481 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

That is the cap,but it >looks< to be in good shape. A power supply component could affect pincushion?

jts1957
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Mar 11, 2010, 10:25 PM

Post #4 of 47 (6479 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

Hour Glass:

With what piece of test equipment did it "look" O.K.?

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

buffalocomputer
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Mar 11, 2010, 10:33 PM

Post #5 of 47 (6477 views)
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Re: [jts1957] CTC167R Pincushion problem [In reply to]	Can't Post

My eyes told me it wasn't bloated or leaking, and they also told me that I would much rather be working on that piece of equipment!!!!!

Ron.M
Veteran

Mar 11, 2010, 11:30 PM

Post #6 of 47 (6475 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

GREAT pix , jts1957....

I guess we need some clarification here.... Wink

....

Quote

Picture has an hourglass that extends 3 inches at the center

Since you did NOT give us a model # :=>.... Unsure

......
Depending on what size the TV is "hourglass" could have different interpetations....
On a small set that would be descriptive of a "pincushion" problem...
On a large TV , say 25" or bigger , that would be a "hourglass" problem....

Quote

A power supply component could affect pincushion?

NO !!!!!....But it CAN give you an "hourglass" !!!!

From jts1957;=>...

Quote

With what piece of test equipment did it "look" O.K.?

Just looking at this cap does NOT neccessarily mean it's OK.....
You need to check it with a cap checker &/or an ESR meter to get a verdict....

Quote

My eyes told me it wasn't bloated or leaking,

Does NOT mean it's OK....

Quote

they also told me that I would much rather be working on that piece of equipment!!!!!

I agree ABSATIVELY & POSALUTELY !!!!
There is a God !!!!

Here's the thing;...You either have a "hourglass" OR a "pincushion" problem....
Which is it ????

Can you take a pix & post it so we can see exactly what it is you're talking about ????
Please post a model # & check the cap......

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

....
Veteran & Retired TV technician

shadetree
Veteran

Mar 12, 2010, 12:10 AM

Post #7 of 47 (6472 views)
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Re: [jts1957] CTC167R Pincushion problem [In reply to]	Can't Post

Hey thats my sister!!!

buffalocomputer
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Mar 12, 2010, 1:09 AM

Post #8 of 47 (6469 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

Ok- 27gt610fe1 25" set, must be hourglass as it does not bow on top or bottom. Also the color is skewed gradually across the left of the tube (like a magnet was sitting next to it) only test equip I have is a voltmeter, so accurately testing the cap is a problem. I am a laptop/camera/video game tech, tv chassis are a bit out of my scope, but I do well with an iron and schematics.

Thanks for replies:)

Ron.M
Veteran

Mar 12, 2010, 3:58 AM

Post #9 of 47 (6459 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;.....

RRREEEEAAAAALLLLLLL nice & polite like;=>.....

Quote

Can you take a pix & post it so we can see exactly what it is you're talking about ???? (I am a laptop/camera/video game tech,)

In reference to the pix you did post;=>>

Relocate the one on the left to your right foot & the two on the right to each nipple.... Crazy

...
That will allow the compressed watchmacallits to stretch & fill your eyeballs wid glee.... Wink

....

Having fun yet ????

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

....
Veteran & Retired TV technician

techchris
Veteran

Mar 12, 2010, 10:11 AM

Post #10 of 47 (6456 views)
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Re: [shadetree] CTC167R Pincushion problem [In reply to]	Can't Post

it's my mum.No wonder I am still being breast fed.

buffalocomputer
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Mar 12, 2010, 1:12 PM

Post #11 of 47 (6452 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

There are still more problems with this set- when attempting to adjust any on-screen video, the screen blanks when the up or down button is pressed, and the adjustment never occurs (+- line stays in middle of range). That is not a big problem, as this is going in kids room, and adjustments will not be needed.

(This post was edited by buffalocomputer on Mar 12, 2010, 1:16 PM)

Ron.M
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Mar 12, 2010, 7:33 PM

Post #12 of 47 (6442 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;.....

THANK you for the pix...Cleared it up nicely.....
You definitely have a PINCUSHION problem....

THIS is an "Hourglass"=>>>

This problem involves a different circuit....
It is NOT in the power supply but in the Horiz out circuit....
Please give me some time to find a schematic or similar wiring diagram & I'll get back to you.....

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

buffalocomputer
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Mar 12, 2010, 8:03 PM

Post #13 of 47 (6440 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

Thank you! Cool

In the meantime, I have a sylvania srt4127w that was blowing fuses. Replaces the rectifier diodes, and now get power, but all video is compressed into 1 horizontal line across the middle of the screen. I would suspect bad vert IC, but do not have schematics... Unsure

mel
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Mar 13, 2010, 1:17 AM

Post #14 of 47 (6433 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

SAMs 3308 says adjust R4803 for straight vertical lines at left and right sides of screen. Components in the 4800 series involve the pincushion circuit. I would suspect any of the electrolytic caps or transitors in this circuit.

Ron.M
Veteran

Mar 13, 2010, 2:12 AM

Post #15 of 47 (6429 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

Apparently Mel has a service manual for your TV....
I STILL can NOT find a "free" CTC167r manual online....Even with the model# , NO luck.... Unsure

...
I did manage to find & replace my corrupted CTC169 manual.... Laugh

.....
I do not know how close , if at all , the 2 chassis are....
The only way to figure that out would be to post a pic of the chassis top view & rear apron view....
In the meantime try Mel's suggestion....

PS:...Post the EXACT model # & Chassis # for the
Sylvania & I'll see what I can do there for you....

GOOD LUCK....

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

....
Veteran & Retired TV technician

(This post was edited by Ron.M on Mar 14, 2010, 12:49 AM)

buffalocomputer
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Mar 13, 2010, 12:43 PM

Post #16 of 47 (6422 views)
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Re: [mel] CTC167R Pincushion problem [In reply to]	Can't Post

R803 is definitely the culprit Smile

- The plastic 'thumbscrew' is broken, and pressure to the component remedys the problem. I checked for bad solder, but that is not the problem. Do you have the value for that resistor so I can get a replacement?

Thank you!

I will get a chassis # for the Sylvania today

buffalocomputer
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Mar 13, 2010, 11:36 PM

Post #17 of 47 (6415 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

That TV Badly needs to be degaussed.. looks like a rainbow on the screen.

Next tv- I have a sylvania srt4127w, BL2700F01012-1 chassis that was blowing fuses. I replaced the rectifier diodes, and now get power, but all video is compressed into 1 horizontal line across the middle of the screen.

Service manual: http://forum-files2.fobby.net/0004/5937/SYLVANIA%206420FE.pdf

Thanks again for help

(This post was edited by buffalocomputer on Mar 13, 2010, 11:38 PM)

mel
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Mar 13, 2010, 11:43 PM

Post #18 of 47 (6410 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

1000 ohm mfr P/N 181106

Ron.M
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Mar 14, 2010, 12:47 AM

Post #19 of 47 (6407 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

IF this is the correct manual :=>..,
http://forum-files2.fobby.net/0004/5937/SYLVANIA%206420FE.pdf ....

look at page #32 in the PDF reader index or page #7-9 ....
On the upper left corner is IC551 , a LA78040A , which is your vertical output IC....
More than likely , it's bad....
You also need to check pin #2 for B+ of 26 vdc....
And C503 (47 mfd @ 35 vdc) for value & ESR....
IC551 is located near the tuner....
C503 is next to the IC...

Which one are you talking about here;=>..."""That TV Badly needs to be degaussed.. looks like a rainbow on the screen."""

Good Luck & have fun.... Sly

.....

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

....
Veteran & Retired TV technician

(This post was edited by Ron.M on Mar 14, 2010, 3:26 AM)

buffalocomputer
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Mar 14, 2010, 12:51 PM

Post #20 of 47 (6396 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

Thank you - I got 0vdc from ground to pin 2 of the LA78040a with the chassis out of the TV on my bench.

The whole 500 component sections looks to have been pretty warm for a while (not surprising being surrounded by heatsinks?) as it is slightly 'browned', the darkest being around R575, 578, 579

Ron.M
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Mar 14, 2010, 5:48 PM

Post #21 of 47 (6391 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;....

Check both ends of R513 for your 26 vdc source...
One side will give you 0 vdc & the other (we hope) should have the 26 vdc....
Also read ohms to ground from pin #2 of IC551....

You need to check the ohms of;=>...

R575, 578 & 579 @ 1/4 watt.....
Each should be 15 ohms....
These 3 , I suspect will probably check OK ,
maybe off value a bit...
IF so you can replace with 1/2 watt resistors....
R513= 5.6 @ 2 watts...Vertical out IC B+...
Use ONLY 2 watt replacement if bad....

PLEASE post results of ALL checks....

ALSO;=>...

Quote

Which one are you talking about here;=>..."""That TV Badly needs to be degaussed.. looks like a rainbow on the screen."""

WHICH ONE ???

Thank you;.... Sly

...

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

....
Veteran & Retired TV technician

(This post was edited by Ron.M on Mar 14, 2010, 5:49 PM)

buffalocomputer
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Mar 14, 2010, 6:37 PM

Post #22 of 47 (6384 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

1st, my apologies - I AM reading 28VDC at pin 2 of the vert chip after replacing the ground probe on my meter... Blush

Contrary to the manual schematics, R575, 578, 579 are all 47 ohm resistors, and R513 is a 4.7 ohm 2 watter
The 47's are within an ohm, and the 4.7 reads 5.2

Not sure why the values different on my board, the schematic routing looks the same...

I am also getting 28.8 VDC on BOTH sides of R513

It is the other TV showing the rainbow (actually lots-o-green on right bottom corner with a bit of warpage, and bluish along the left side)

Ron.M
Veteran

Mar 14, 2010, 7:17 PM

Post #23 of 47 (6380 views)
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Re: [buffalocomputer] CTC167R Pincushion problem [In reply to]	Can't Post

buffalocomputer;.....

Quote

Not sure why the values different on my board, the schematic routing looks the same...

OK , the manual is close but no cigar....
ARE you SURE it's the right one ???
Where did you find it ???
We may have to make do with what we got...
The resistors can be taken as good...All are within tolerence....

Is the pix compressed down to one skinny line across the screen OR is it about 1/2 inch or larger so you can see some video ???
Did you check C503 (47 mfd @ 35 vdc) for value & ESR ???....

Quote

It is the other TV showing the rainbow (actually lots-o-green on right bottom corner with a bit of warpage, and bluish along the left side)

When you get the control installed for the pincushion & adjusted , PLEASE take a pix WITH video & post it....
AND pix's of the chassis as earlier requested...
I'm 99.99997% certain I know what that is....But need to see it....

Apology not needed.....Everyone has equipment failure (& mental lapses) at one time or another.... Wink

....

PLEASE answer ALL questions & post....

THANK you.... Sly

....

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

....
Veteran & Retired TV technician

buffalocomputer
New User

Mar 14, 2010, 7:45 PM

Post #24 of 47 (6376 views)
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Re: [Ron.M] CTC167R Pincushion problem [In reply to]	Can't Post

TV #1 ^^^^

TV2:
The manual was googled and is for a smaller Sylvania set, but has same chassis #. Perhaps different revisions of the same chassis?

1 very skinny line (maybe 1/8 in.)

I only have a cheap multi, so cap checking is basic... I did the ohms check, started at infinity, raised gradually for a sec. or 2 then back to infinity.

Ron.M
Veteran

Mar 14, 2010, 9:02 PM

Post #25 of 47 (6374 views)
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buffalocomputer;....

THANKS for the GREAT pix....
Are we having a problem ("maybe" Alzheimers.. Wink

..)....
RE;=>......

Quote

When you get the control installed for the pincushion & adjusted , PLEASE take a pix WITH video & post it.... <<EXCELLENT JOB !!!
AND pix's of the chassis as earlier requested... << Alzheimers , right ???

OR "memory lapse" or back cover is on , or ???
Needed BOTH !!!

Quote

I only have a cheap multi, so cap checking is basic... I did the ohms check, started at infinity, raised gradually for a sec. or 2 then back to infinity.

That is NOT the way to check caps , especially electrolytics !!!!!... Frown

...
ALL that does is tell you the cap is able to charge up...That's IT ... Unsure

....
I have 2 cap meters , 1 for ESR (The one below) & 1 for value....Both cheeeep !!!
One of the best ways is to get a cheap ESR meter.... Smile

....
Suggestion;=>...
http://matelectronics.com/...L_2d3333#aMUL_2d3333

It's cheap & basic , but it gets the job done...
IF you decide to get it , I'll give you some important advice on how to use it....

For now , just go to your local parts store & buy a 47 mfd @ 35 vdc (or 50 vdc if they don't have a 35 vdc cap) cap & replace it....

Also check on the number on the vertical IC....Is it the same as what's in the manual ???

Thank you.... Laugh

....

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

....
Veteran & Retired TV technician

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