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- - 24NC31 Zenith, give me your thoughts... (http://www.videokarma.org/showthread.php?t=92907)

The Caps are here! The Caps are here!

Actually, they arrived a few days ago.

I was all set to reward myself with some old TV work after doing a bunch of less-fun stuff over the past few days. So I warmed up the old soldering iron and sat down to work...

...And quickly realized that I had forgot some of what I had taken apart a few weeks ago...:sigh:

I had unsoldered two capacitor cans, and now I can't be sure how they were installed. One was a 160 mfd can, and the other was a 160mfd/80mfd can. I did label the leads, but here's the problem:

One of the leads was soldered from one terminal of the 160mfd can, to another terminal on the other 160mfd/80mfd can. I labled them both "160mfd".

Here's a pic:

http://img.photobucket.com/albums/v6...lor2/caps1.jpg

Now one of these I marked with a square (as per the can) so I'm pretty sure it leads to the + side of a 160mfd cap. However, the other lead is simply marked with a triangle (again, per the can). I might assume that this side was the - , but why would there be TWO leads to negative?

As was mention by someone else earlier, one of these cans does not "ground" to the chassis... Should I assume the others do?

Can someone tell me if this is correct:

Lead labeled 80mfd connects to the + side of an 80mfd cap, - side of cap to chassis.

Lead labeled 160mfd (square) connects to the + side of 160mfd cap (I actually already did this in the photo) - side of cap to ??? (Because this cap was not grounded to chassis)

Leads labeled 160mfd (triangle) connect to ???

This is damn hard to explain in a written post...

Quote:

Originally Posted by Carmine

Actually, they arrived a few days ago.

I was all set to reward myself with some old TV work after doing a bunch of less-fun stuff over the past few days. So I warmed up the old soldering iron and sat down to work...

...And quickly realized that I had forgot some of what I had taken apart a few weeks ago...:sigh:

I had unsoldered two capacitor cans, and now I can't be sure how they were installed. One was a 160 mfd can, and the other was a 160mfd/80mfd can. I candid label the leads, but here's the problem:

One of the leads was soldered from one terminal of the 160mfd can, to another terminal on the other 160mfd/80mfd can. I labled them both "160mfd".

Here's a pic:

http://img.photobucket.com/albums/v6...lor2/caps1.jpg

Now one of these I marked with a square (as per the can) so I'm pretty sure it leads to the + side of a 160mfd cap. However, the other lead is simply marked with a triangle (again, per the can). I might assume that this side was the - , but why would there be TWO leads to negative?

As was mention by someone else earlier, one of these cans does not "ground" to the chassis... Should I assume the others do?

Can someone tell me if this is correct:

Lead labeled 80mfd connects to the + side of an 80mfd cap, - side of cap to chassis.

Lead labeled 160mfd (square) connects to the + side of 160mfd cap (I actually already did this in the photo) - side of cap to ??? (Because this cap was not grounded to chassis)

Leads labeled 160mfd (triangle) connect to ???

This is damn hard to explain in a written post...

I took a look at the picture you put up when your set went down and it looks like there are two yellow wires that went to the - side of the isolated 160 uf cap. One brown wire to the + side. Double check that to make sure I am not wrong. Just look at the can caps and see how they are mounted to the chassis. Check and see if they go to the chassis ground or have a sleeve to isolate it from chassis ground. The 160 and 80 uf can should go to chassis ground but still double check the picture on that one too. On most can caps the metel can itself is the ground side of the caps in it.

I don't have that schematic, but usually these power suppiles are similar. Usually one of the 160s sort of sits across the output of the power transformer, the + side connected after the rectifiers, and the negative directly to the other side of that winding of the transformer and also to + side of the other 160. The - side of that 2nd 160 goes to chassis ground. But I'd hold out for a schematic to be sure before trying it.

Zenith would have a can floating it would be the can covered with a cardboard sleeve.