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Videokarma.org TV - Video - Vintage Television & Radio Forums (http://www.videokarma.org/index.php)

- Solid State CRT Televisions (http://www.videokarma.org/forumdisplay.php?f=184)

- - Zenith 25DC56 console TV acquired! (http://www.videokarma.org/showthread.php?t=266869)

MRX37

04-29-2016 08:31 AM

Quote:

Originally Posted by TUD1 (Post 3161378)

I sure hope so. I don't have a test pattern generator to do any convergence or purity or anything. I'm going to take a look at those capacitors and replace them and replace the CRT socket, and hopefully, I'll be in business.

Do you have a DVD player? Can you burn a DVD?

If yes then here's your test pattern generator:
http://techpreservation.com/dvddl/testdisc.htm

TUD1	04-29-2016 08:59 AM

I'm not too concerned with test patterns right now. My main concerns are those three safety caps, the CRT socket and the tripler. When I get a raster, I'll proceed from there. I can't burn a DVD anyhow - all that computer hogwash confuses me.

dieseljeep

04-29-2016 09:40 AM

Quote:

Originally Posted by zeno (Post 3161402)

Yes you MUST. There are 2 on the flyback & 3 more under the chassis.
They are 22-5001 Zenith OEM. If you cant find them check with
findemkeepem (sp?) he can point you to the RIGHT substitute.
You can use almost any socket. The only difference in Zenith
sockets I ever found is lead length & push on connectors.
The tripler has been changed & focus divider deleted. If you change
it back USE OEM. IIRC the divider is NOT the common 800-616 kit.
Check with someone with a parts book for subs. IIRC its 63-9898
but its been years.

Here is the scenario...
One or more caps opened & the HV & focus went up. That
caused the socket to arc, the divider to crack or melt then
finally the tripler to burn or open. A butcher moused the set
but left it with bad caps so it happend again. Now odds are the
tripler is gone again.

73 Zeno:smoke:

I don't remember seeing a value on the replacement caps, only a Zenith part number. IIRC, they were a carefully selected value, with a close tolerance.
I never subbed Zenith HV parts, as Zenith had one of the oldest and best distributors located in Milwaukee. It was very seldom, that they had to order anything. Their stocks were that complete! :thmbsp:

ed857

04-29-2016 09:49 AM

Those Caps. are .0018mf @ 1.6KV.

What I've done B4 is replace all 5 caps. with one 800-616 ( .01mf @ 1.6KV )

Ed

dieseljeep

04-29-2016 10:09 AM

Quote:

Originally Posted by ed857 (Post 3161413)

Those Caps. are .0018mf @ 1.6KV.

What I've done B4 is replace all 5 caps. with one 800-616 ( .01mf @ 1.6KV )

Ed

I was thinking about that very thing myself! :thmbsp:
I haven't worked on one of those sets for probably 30 years and of all the Zeniths I have, I don't have one of that model. :sigh:

TUD1	04-29-2016 07:10 PM

I really don't see what's so special about the 22-5001 special cap. I mean it's just a capacitor - I didn't know it was that critical. If I used a .0018 with at least a 1.6 KV rating - what difference does it make? I took the 25DC56 out of the cabinet today. I'm going to take it to the radio club and clean all the controls and whatnot. I'm also supposed to get a CRT tester.

jr_tech

04-29-2016 08:19 PM

Quote:

Originally Posted by TUD1 (Post 3161442)

Some discussion of the safety cap issue here:

http://www.videokarma.org/showthread...nith+capacitor

jr

TUD1	04-29-2016 08:53 PM

Interesting thread. I'm glad I learned that polyester caps can't handle the high voltage pulses. Polypropylene it is. I can't wait to get this TV fixed - I already know where I'm going to put it. I'm keeping my fingers crossed that the CRT checks good. Assuming I get a tester tomorrow.

TUD1	04-29-2016 10:39 PM

I took the tuner out of the set and used up the last of my tuner cleaner on it. Not the Tun-O-Wash - but my newer Radioshack stuff. Even being a gold tuner, it was still very tarnished.

TUD1	04-30-2016 12:58 PM

Good news! The picture tube checked good on my new RCA WT-115A. All three guns checked right around the same.

TUD1	04-30-2016 01:31 PM

We also replaced the white safety caps with .002 at 1600 volt Sprague Orange Drops. Everybody there seemed to think that those caps would be just fine in there. If they're not - I'll just have to take them out again.

sampson159

04-30-2016 08:19 PM

i just aquired a flat chassis today.had high voltage with a vertical collapse.cleaned the module and controls,voila!a working set with a beautiful crt.the cabinet is a mess but the set will also require a tuner rebuilt and full restore on the cabinet.the crt delivered a fine,razor sharp pic today.it was a trade from fellow vker Os X.i couldnt make the etf today but we made some nice trades.i got a nice bugeye zenith with stand and a zenith full tuber that needs some help.all told,good day and met a really nice fellow

TUD1	04-30-2016 11:29 PM

Nice! I always find it fascinating with both radios and TV's that the set with the cabinet in good shape will almost always have a chassis in bad shape, and a set with a very poor condition cabinet will have a chassis in good shape - usually working out of the box. I find this phenomenon to be very consistent. Take my Zenith Chromacolor for example - the cabinet is in near mint condition, but the chassis has suffered a meltdown.

Electronic M

05-01-2016 06:44 AM

Orange drop style caps were the better and later safety cap option.

TUD1	05-01-2016 09:21 AM

Good. I was informed that even though the new caps are only 200 picofarads higher than the original, it could still affect the horizontal deflection. I guess we'll just have to wait and find out. I'll also be deleting the instant on feature.

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