Admiral 20B1 Combo restoration - Page 3 - Videokarma.org TV - Video

SwizzyMan · #31 10-01-2015, 02:41 PM

I must note that I am only keeping it on for about 3 seconds at the most. Just to see if the problem is still there. But I am still at a loss as to WHAT I messed up. I have been going over schematics and looking for shorts and cant find anything. I will just redo the electrolytics this weekend and see how it goes.

SwizzyMan · #32 10-07-2015, 04:04 PM

Fixed my red plating issue. Broken cap lead inside the electrolytic. Now it seems that my filter choke is smoking!! It is the one beside the 6x5 tube. Still no raster. Could this power supply be a complete loss or should I keep going with it? Anyone have a spare 20B1 combo power supply lying around I can have?

***Eric H*** · #33 10-07-2015, 04:42 PM

If you had the Cap hooked up wrong originally it might be shorted now even if it's hooked up right.

Can you bypass the switch and power up the PS by itself and see if it still has a short?
At least you would know if the short is in the PS or the Chassis somewhere.

SwizzyMan · #34 10-10-2015, 11:48 AM

cant power up the TV without the power supply I think.

Anyone else have any input?

***Eric H*** · #35 10-10-2015, 01:12 PM

I was under the impression the problem was with the power supply?
Of course the short could be either in the power supply or the TV chassis so I was suggesting powering up the supply by itself and see if it still has a problem and checking the output voltages to see if they are correct.

SwizzyMan · #36 10-10-2015, 01:15 PM

My bad the power supply is the problem. I cant run the power supply chassis without the tv chassis hooked up since the tv supplies the filaments and other voltages besides the AC to the power supply..

SwizzyMan · #37 10-10-2015, 04:42 PM

Also not sure why I can't get a raster.... I have an ultor of about 7.8kv

***Eric H*** · #38 10-10-2015, 06:08 PM

Everything on this diagram is on the power supply chassis isn't it?

With the power supply disconnected from everything else you should be able to put 120VAC on the primary where the Phono Motor is attached and run the power supply by itself.

If you still get red plating on the rectifier then the short is on the PS chassis, if not then it's further downstream in the TV or radio chassis, it should be fairly easy from there to figure out exactly which circuit has the short on it.

I'm guessing your High Voltage is low because of the drag on the power supply voltage.

El Predicta · #39 10-10-2015, 06:22 PM

I may have an extra power supply, will check.

SwizzyMan · #40 10-10-2015, 06:41 PM

Eric, You may have missed this but I did solve my red plating issue (broken ground lead on the electrolytic) My problem now is that my filter choke I THINK is smoking. And I can't seem to find out why.

SwizzyMan · #41 10-10-2015, 07:43 PM

Also I forgot to mention. I forgot to replace a .002 uf paper cap on the output plate bypass. That could be a potential problem!

SwizzyMan · #42 10-11-2015, 02:33 PM

With the power supply disconnected from the TV and the radio but turned on everything seems to be fine now. No smoke, nothing..

SwizzyMan · #43 10-21-2015, 04:46 PM

Anyone have a spare 20b1 combo power supply I could have?

Electronic M · #44 10-21-2015, 04:53 PM

If the supply don't smoke running disconnected from the TV and radio chassis, and is producing rated or higher voltage at all outputs, then the power supply chassis is fine. There is likely a short or excessive power consumption in the TV and or radio chassis.

SwizzyMan · #45 10-21-2015, 04:55 PM

Will check for anything this weekend. Didnt think I'd have so much trouble working on this.