53 Sylvania first start after recap! HELP - Videokarma.org TV - Video

Mick AV-8 · #1 11-10-2009, 06:38 PM

Well guys here is my view of the picture screen after all the recaping and endless questions.
Now the saga continues. The raster is low and to the right on the screen.
The photo shows a line but I can not see it with the eye, but it is not filling the screen.
Moved the magnet on the neck around forward and back.. and this is the best I can obtain.
Hope I am not in trouble, and you can help me make some adjustments??
Still got my fingers crossed and hoping for the best.

kvflyer · #2 11-10-2009, 07:04 PM

Two things I would try first. Make sure the yoke is all the way up to the bell of the tube and if this set has an ion trap, I would bet it is not in the right place. Do not despair, your picture tube appears to be good, the flyback is good and the yoke is good. It is easy for me to say, but it is all down hill now...

Mick AV-8 · #3 11-10-2009, 08:44 PM

Not sure what the screw is on the yoke?
Think it is labeled centering..does that twist the yoke to throw the picture left or right? Can you just take a screw driver and turn it in or out?
Turned the horz. size and height controls. Worked the magnet on the neck..is that the ion trap you mentioned?
Got the raster to fill the full screen

Have an old VHS and the 300Ohm connector.
If I hook these up to the antenna switch..I should be getting a pictured right?
And if this works..I read I might be able to run a VCR through the old VHS.
Or I might need to buy a modulator?
But so far I am really pumped that it has started up with no fiasco.

Mick AV-8 · #4 11-10-2009, 08:48 PM

Also forgot to mention that if I place my hand near the horiz. osc. tube it will hum.
slight high pitch ring... take it away and the ring goes away. put my hand near it and slightly turned the AGC screw and it dissapeared.
Whats that all about?

Charlie · #5 11-10-2009, 09:39 PM

The line in the photo is a result of using the digital camera. Each photo you take will show the line in a different position.

Your VCR should work without using the seperate modulator. If you have a VCR with 300 ohm outputs, that really is old!! Next time you're at Walmart, pick up a 300/75 ohm transformer to leave on the back of your set. Radio Shack will have them as well.

If that tube hums when you put your hand near it, stop putting your hand near it!

Nah, I don't think I've heard of that happening. Perhaps someone else has. The high pitch ring you hear is normal. If you were to play with the horz hold, you'll hear the pitch change as you are changing the frequency in which the tube operates. Some sets are pretty loud... others are not. My 72 Zenith is quite anoying I think.

The screw you mention... is it on the back side of the yoke assembly? If it's not for centering, it may be your focus. I think my Philco uses a focus like that. If you have your Sams for the set, the last page showing the rear of the set should tell you what that screw is for.

You got light on the screen and no nasty surprises... that's good! You'll find that you'll be doing lots of tweaking for a while once you run a tape or DVD for producing a picture. Keep in mind that if you run a tape in the VCR, the top part of the screen will likely pull to one side. That's pretty normal on old sets mixed with VCR tapes.

Also, you can plug a DVD player into the back of the vcr and set vcr to line in to get a dvd to play on it. YOur vcr would be working as your modulator for you.

jr_tech · #6 11-10-2009, 09:42 PM

LIGHT!!!

If you are talking about the screw sticking out above the base of the tube, it is the focus:
http://www.videokarma.org/attachment...8&d=1257472420

Is your focus ok? you might try turning the screw a few turns either way to see if it improves.

When you play a VCR tape, you may experience "flagging"... the top few inches of the screen may appear to be waving horizontally... this is fairly common on older sets, and perhaps the Horizontal AFC circuit can be modified to correct this. A DVD should work fine, with no flagging. Play through a modulator, or perhaps through your VCR.

jr

jeyurkon · #7 11-10-2009, 11:11 PM

The long screw sticking out above the base of the CRT is the vertical centering. The large diameter screw with the hole in the center is the focus.

Did you keep track of the orientation of the ion-trap when you removed the CRT? You might need to try flipping it around if not.

You've actually made good progress!

John

jr_tech · #8 11-10-2009, 11:45 PM

"The long screw sticking out above the base of the CRT is the vertical centering. The large diameter screw with the hole in the center is the focus."

OOPS!

I have seen way more Philcos than I have Sylvanias* !

jr

*In fact, I don't have a Sylvania set...yikes! I gotta fix that!

Mick AV-8 · #9 11-11-2009, 06:55 AM

Okay..so if the long screw is for vert. centering ...does this move the screen shot form left to right depending on the direction of the screw in or out>
It kind of looks like the yoke has some kind of spring in there and this can push back or colapse as it is adjusted?
Just wondering if some one can explain this..because once I try and get an actual picure..I know the adjusting will really then begin...
And again thaks to all who have given me there help..this is fun when things actually work!

jeyurkon · #10 11-11-2009, 07:07 AM

Quote:

Originally Posted by Mick AV-8

Okay..so if the long screw is for vert. centering ...does this move the screen shot form left to right depending on the direction of the screw in or out>
It kind of looks like the yoke has some kind of spring in there and this can push back or colapse as it is adjusted?
Just wondering if some one can explain this..because once I try and get an actual picure..I know the adjusting will really then begin...
And again thaks to all who have given me there help..this is fun when things actually work!

I believe it moves it up/down as you adjust the screw in and out. There doesn't appear to be any adjustment for horizontal centering. Or, maybe I have it reversed.

Could you give us a photo of where the ion-trap is positioned?

John

Mick AV-8 · #11 11-11-2009, 10:15 PM

Thanks guys!
Here are a few more pics.
The trap is just off a little from original marking.
I guess I have flagging on the top.. I am running a tape from my old VCR.
The Great Waldo Pepper!
On the right is a dent..kind of a black spot pushing the picture and the top of the heads of the actors is pushed over to the left a little. Not sure if you can see it in the picture..but wondering what would adjust the left distortion?
Not sure if this is flagging? or something else.

jeyurkon · #12 11-11-2009, 11:57 PM

Quote:

Originally Posted by Mick AV-8

Thanks guys!
Here are a few more pics.
The trap is just off a little from original marking.
I guess I have flagging on the top.. I am running a tape from my old VCR.
The Great Waldo Pepper!
On the right is a dent..kind of a black spot pushing the picture and the top of the heads of the actors is pushed over to the left a little. Not sure if you can see it in the picture..but wondering what would adjust the left distortion?
Not sure if this is flagging? or something else.

A VCR isn't the best source and what you see may be flagging.

Check, using the Sylvania schematic and not the Sam's, C193 and make sure it's a 0.005 uF capacitor and not something larger. It's across the cathodes of the horizontal disc tube, V17 a 6AL5. If it's larger then flagging will be more of an issue.

The black bar on the right could be because of the VCR source, it could be a horizontal phase adjust, or a centering problem.

It would be better to make sure you have a good video source first, but adjust the contrast to near minimum and raise the brightness until you can see the horizontal blanking on the right side of the picture. It should be about 1/4" wide. If it's larger, then the horizontal phasing either needs adjusting or the VCR source is an issue.

If the above explanation doesn't make sense I'll take a photo of my screen and label it.

Is the raster somewhat dim or is that just how the photo appears?

Oh yeah! You have a picture! Aren't you excited! Congrats!

John

Charlie · #13 11-12-2009, 07:18 AM

Congratulations! She is coming to life!!

It looks like your camera needs an adjustment of some sort.

If you have a DVD player or a over-the-air digital converter box, plug those outputs into the VCR inputs and run that on the screen.

Mick AV-8 · #14 11-12-2009, 07:37 AM

I will check the cap to see if it is no larger than .005uF.
I was turning and tuning for a few hours..
Tried to plug in a DVD player into the VCR..but found out it was not working.
So I will probably go a get a chepo DVD and look for a modulator.
Any suggestions as to what would be a decend type of modulator?
I had to put my finger over the camera flash..as it keep whipping out the photo picture.
It is not too bad..especially in a dark cellar workshop.

On the right knob..the channel tunner and in the middle is a center knob.
They seem to turn as one..I can hold the outside of the channel tuner knob...and then with other hand turn the center knob. Center knob does not seem to realy do much. So not sure if it is suppose to turn freely from eachother?

I can get a decent picture..then turn the channel tuner about two full turns and pick it up again. I should not do that right..once you have it picked up turning to find it again in another location on the dial wouldnt make the picture better would it?

Oh yeah..anything you can do in regards to pictures and instructions would be much appreciated. I now others will learn..as I read these and other posts and there are many lurkers like me who enjoy the informative discussion. MUCH APPRECIATED and YES ..first there was ..light..then now a PICTURE!!

Charlie · #15 11-12-2009, 08:02 AM

Quote:

Originally Posted by Mick AV-8

I can get a decent picture..then turn the channel tuner about two full turns and pick it up again. I should not do that right..once you have it picked up turning to find it again in another location on the dial wouldnt make the picture better would it?

If you're talking about turning the fine tuner full turns and getting a picture each time, that's normal. Some fine tuners have a stopping point, some do not. If you watch the inside of the tuner as you turn the fine tuning knob, there's a cam that pushes a spring loaded pin in and out. That pin is what's making the fine tune adjustment. Once you go around the world once, it starts over again.

Quote:

Originally Posted by Mick AV-8

On the right knob..the channel tunner and in the middle is a center knob.
They seem to turn as one..I can hold the outside of the channel tuner knob...and then with other hand turn the center knob. Center knob does not seem to realy do much. So not sure if it is suppose to turn freely from eachother?

If the channel selector and the fine tuning are turning together, it could be a few things... the shafts could be slightly bent, the shafts could use a shot of spray in there to loosen old grease between the two shafts, or the knobs themselves are rubbin against each other. Seems I recall my HaloLite has a shaft issue as well. It's even worse with the chassis inside the cabinet. It's as if they didn't give quite enough shaft length for the knobs to fit on there well. They could have also designed the knobs a little better.

As far as modulators go, I don't think it matters too much. I have several, and they all seem to perform the same. Haven't bought one in a while, but i would think you could get one at WalMart or Rat Shack for 20 bucks.