Old Muntz TV for sale Locally to me, Should I pick it up?

[vortalexfan]

Originally Posted by Kevin Kuehn

Found a pdf download of the manual for your scope. That's a very nice scope.
http://bama.edebris.com/manuals/tek/453/
The controls on those vintage scopes are all very similar, and really not as scary as you might first think.

Yes, I did find that manual and downloaded it, and read through it, just not sure where where everything hooks up in regards to trying to find the waveform for the horizontal and vertical oscillator and what switches should be used and which ones shouldn't be used.

[Electronic M]

Originally Posted by vortalexfan

Yes, I did find that manual and downloaded it, and read through it, just not sure where where everything hooks up in regards to trying to find the waveform for the horizontal and vertical oscillator and what switches should be used and which ones shouldn't be used.

Sam's lists scope measurement points and shows correct waveforms in most TV manuals.

[Kevin Kuehn]

Originally Posted by Electronic M

Sam's lists scope measurement points and shows correct waveforms in most TV manuals.

I've never seen much until you get into the late 50's -60's. Riders is more likely to show whatever the manufactures provided. But it's still best practice to do some reading and get yourself a basic understanding of where to look, and how to use an oscilloscope. I suppose some of the old time repair guys will say you don't need a scope, but that's a hard way to learn in my opinion, and without the theory you end up learning from trial and error more so than understanding what's actually going on. Maybe that's just me, because I tend to grab the scope even when taking DC voltage measurements, just to see how much and what kind of AC signal may be present.

[Kevin Kuehn]

Originally Posted by vortalexfan

Yes, I did find that manual and downloaded it, and read through it, just not sure where where everything hooks up in regards to trying to find the waveform for the horizontal and vertical oscillator and what switches should be used and which ones shouldn't be used.

You would do well to find yourself a couple books on early television servicing. A very good one is Television and FM Receiver Servicing by Milton Kiver, or any TV servicing books written by Milton Kiver in the early 50's are going to be very similar in content. What you want is material from or slightly after the period of the first consumer televisions. Those will tend to give you the most basic understanding, although they are all going to assume you have a basic understanding of AC and DC circuits and AM radio operation. TV repair is one of those subjects where it's very difficult to jump in feet first without first making your way though the ranks of simpler circuits. You absolutely need a solid understanding of those basic building blocks.

[vortalexfan]

Originally Posted by Kevin Kuehn

You would do well to find yourself a couple books on early television servicing. A very good one is Television and FM Receiver Servicing by Milton Kiver, or any TV servicing books written by Milton Kiver in the early 50's are going to be very similar in content. What you want is material from or slightly after the period of the first consumer televisions. Those will tend to give you the most basic understanding, although they are all going to assume you have a basic understanding of AC and DC circuits and AM radio operation. TV repair is one of those subjects where it's very difficult to jump in feet first without first making your way though the ranks of simpler circuits. You absolutely need a solid understanding of those basic building blocks.

I have repaired successfully many radios and have a basic understanding of how those kinds of circuits work. So I'm surprised that this TV is kicking my butt as much as it is.

Although I don't think it helps any that this TV was in a house with no roof and no climate control for over 20 years. That might be part of why this TV is giving me such fits.

[Kevin Kuehn]

Originally Posted by vortalexfan

Although I don't think it helps any that this TV was in a house with no roof and no climate control for over 20 years. That might be part of why this TV is giving me such fits.

You're exactly right. It's not a simple recap and play, this one requires more advanced troubleshooting and a deeper understanding of the circuitry. It's very difficult for anyone here to give canned answers as to what may fix it without being able to troubleshoot the circuitry.

[vortalexfan]

Originally Posted by Kevin Kuehn

You're exactly right. It's not a simple recap and play, this one requires more advanced troubleshooting and a deeper understanding of the circuitry. It's very difficult for anyone here to give canned answers as to what may fix it without being able to troubleshoot the circuitry.

my guess is that besides the capacitors being bad in this thing (which all of the capacitors have all been replaced now), ALL the resistors are bad as well which will require all of the resistors to be replaced as well, in order to help fix the excessive current draw.

I have about 25% of the resistors replaced already, and I think I'm making some progress, not a whole lot of progress but some.

I think I have the oscilloscope figured out as far as how to use it, I just need to figure out where the test points are for the horizontal and vertical oscillators, and figure out which voltage scale to and time scale to use to test the vertical and horizontal oscillators in this tv, which unfortunately Sam's isn't very helpful in that regard...

[vortalexfan]

OK, I just had another thought, How would one test the Vertical output transformer, Horizontal output transformer/flyback transformer, and the vertical block oscillator transformer to see if they aren't shorted or open?

[vortalexfan]

OK So here's a YouTube Link to my Video showing what the TV is currently doing.

https://youtu.be/TfFZxX8DOQU

Hopefully this will work better, and won't require you to log into a Google Account.

P. S. You'll have to turn up the volume really loud to hear the audio.