1949? Motorola 10VT24R, TS-14B chassis

[ZackN920]

Well, i've got this one back in front of me. I ended up putting it back together and out of the way for whatever reason, that im not sure of anymore...Either way, it's been too long.

Anyway's, when I got it back out, I found I have more issues than before. For one, I lost my High Voltage... or at least what is required to get a rastor. I found that a resistor on one of the 1N4007 diode's went open. For now I just took that resistor out of circuit. It's not absolutly necessary right now.

Got HV back, but I have no vertical deflection...Just a horizontal line. That one I can't figure out. I replaced some resistors in the vert circuits, but still have no vertical. Checked a number of other's and cant find any way out or shorted. My tubes are good, and I had it before I put the set away.
Should I swap some of the previously changed caps? I rechecked the vert. transformer and that's still good. What do any of y'all think???

[Phil Nelson]

So, it worked (full raster) when you put it away, and then the vertical collapsed when you brought it out and tried it again?

I'd look for a loose or broken connection somewhere. Have you tried wiggling the tubes? Did you ever clean the tube pins & sockets? Did you clean controls (such as vertical hold)? Is it possible that a blob of solder or a snipped wire stub fell into the wrong place and made a short circuit? Eliminate simple/obvious causes like that before you start chasing more exotic issues.

I would not "shotgun" all of the new caps that you installed. Your TV was mostly working before. It's possible for a new part to fail, but that's far from a common scenario.

I would also put back the resistor that you eliminated. Parts are there for a reason.

If your service manual includes a voltage chart, how about checking the voltages on the vertical tubes? Same deal if the manual has a resistance chart.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[ZackN920]

Originally Posted by Phil Nelson

So, it worked (full raster) when you put it away, and then the vertical collapsed when you brought it out and tried it again?

Yup

Originally Posted by Phil Nelson

I'd look for a loose or broken connection somewhere. Have you tried wiggling the tubes? Did you ever clean the tube pins & sockets? Did you clean controls (such as vertical hold)? Is it possible that a blob of solder or a snipped wire stub fell into the wrong place and made a short circuit? Eliminate simple/obvious causes like that before you start chasing more exotic issues.

I did all of that previously. No blobs of solder...I'm very careful about that.

Originally Posted by Phil Nelson

I would also put back the resistor that you eliminated. Parts are there for a reason.

That resistor was not original to the set, and therefore was not even listed in the schematic. It was one of the resistors I put in when I took the celenium rectifiers out and replaced them with diodes.

Originally Posted by Phil Nelson

If your service manual includes a voltage chart, how about checking the voltages on the vertical tubes? Same deal if the manual has a resistance chart.

Still haven't gotten to checking voltages while on, but did check resistances. Did not help at all. Everything was off, making me think my schematic is wrong for the set. I expected to find a few values off, but not everything!

I did find the reason though. There is a shielded wire that runs from the vert out. tube to a lug with some caps on it, and I found that the outer shielding of the wire was shorting to the inner. Seperated the two at the end of the wire and BAM! Full deflection back

[ZackN920]

Had an interesting few weeks...ah, Jury Duty....Part of being an American! Interesting experience, especially with the Federal...

Anyway's, finally got back to this thing. It's working again, and a little better than before! Changed some resistors out when I was searching for the issues (previous to today) that I was having. Also found that this 10BP4 is in much better shape than I thought. Set still has issues....which of coarse, i'd appreciate help with

Well, I explained in the post above, that I got my vert. deflection back. I also solved the previous issue of the set running worse with full voltage, as compared to the 85 volts beforehand. Also readjusted the ion magnet at the end of the crt, because I noticed a shadow on the edge of the pic. Got it adjusted well, and now this thing gets much brighter than It could before, and the set has GREAT contrast with it.

On to the problems I still have. Two things obvious with the image on the screen. During a still shot, there is an obvious, MAJOR wave going on. Like a flag... I also still have that issue with the vertical lines that go down the screen. (I got a few pics that i'll post later.) These lines do disturb the linearity a bit.

On to the other issues that aren't too important, but still odd and could (probably) be made better.
First off, The sound don't match with best pic on this set... It matches with the worst pic. (When it comes to fine tuning.) I tried to get it re-aligned but its a different set up than the other sets that i've had to deal with this situation on.
Second issue, Transformer (T1 on the SAMS schematic) gets HOT after an hour. Hot as in, don't hold it for longer than 15s or it'll burn. I believe this is the filament transformer.
Third issue would be operation of some of the rear controls. Horizontal & Vertical Hold's don't have much range before they lose sync. I've read that some of these earlier Motorola's though, don't have the best of sync.IDK...
I also found that the Horizontal Linearity control is funky too. It acts more like a brightness control that has less range..

Well, that's where I'm at now. I'll get some pics of my vid issues tomorrow.

[ZackN920]

Got the pics now...
Anyone know of a good hosting site that won't bog down my computers? Even my newer laptop get's bogged down by photobucket, and I'm going to be running low on space, if I keep posting them to Videokarma...