Motorola TS-430B-02. Anyone ever heard of it?
 

Hey all, I'm trying to bring this table top Motorola tv back to life and can't find any information on it. The chassis model does not show up anywhere online, and searching for Motorola portable TVs and table top TVs brings nothing up on the internet that looks like it.


The problem right now is just lack of power. I couldn't find a schematic since there is no record online of this set that I can find. I replaced all of the capacitors and all of the tubes test good, but I can't find any fuses to check

Also I don't know what the deal is, but all of the components on the neck of the CRT move freely. They shouldn't be doing this.. I might have put time and money into something that can't be saved.

It's in Riders TV Manual 25.

There should probably be a clamp and sleeve like extension on the back of the yoke. The extension probably was made of a plastic that crumbled. I don't know if there should be a ion trap also on that CRT.

Here is a link to a thread on this forum where Crist rebuilds the rear of a yoke. Just to show what could be done.
http://videokarma.org/showthread.php?t=268978&page=7

You say there are no fuses but are you familiar with fusistors? Fusistors look like resistors often the sand coated variety and are often in series with one leg of the power cord. If it don't have a fusistor get a DMM and follow the AC power system looking for opens...Could be as simple as a failed open power switch (I see that plenty).

Looks like a 17P5 i once owned... Look very closely at the tube chart on the FB cage, this is a series string hot chassis, Check the white round resistor next to the tuner on the chassis its in-line.... LOVED that tv when i was a kid.. :)

SR

I got really familiar with fuse resistors when I did audio repairs. Every pioneer and sansui that came in had so many blown fuse resistors. Gosh was that awful.. I'll check this set and try tracing the AC. I just figured the fuse would be obvious in a tv since they were supposed to be pretty user serviceable to an extent.

Making that part to hold the yoke is probably something I can't do myself, but if the chassis comes to life it'll be worth a shot.

There is another strange thing going on. There is a place in the set where two pins are sticking up with nothing bridging them, but it looks like something should be bridging them. On the little diagram it is the little cylinder part to the right of the tube with "16ohms hot, 175ohms cold" next to it.

Hey looking at the picture I think this is a 17P5, or at least something very close.

The part that's missing is called a thermistor and is why it's dead. For testing just use a 5 watt or larger 15 ohm resistor.

Is the thermistor similar to a round black fridge magnet? I found an odd piece in the bottom of the casing and was wondering what it was.

Also anyone know what the black stuff is that peeling off the back of the CRT and making a mess everywhere?

Heres the guts of mine...

Forget the in line diode. I confused it with another model.. See that corner piece of cardboard by the red adjustment straw and yoke plug? See if theres a fuse hiding under there.. Yours is the SAME color as my first 17P5 was...

SR

Yes. A thermistor is typically a black disc. round the size of a nickel but thicker.

The black CRT coating is called "aquadag" It's conductive and grounded to form a capacitor thet filters the high voltage supply. You should recoat it once you've got the set working with something called "slip plate".

https://www.slipplate.com/product/slip-plate-aerosol

MG Chemical makes a similar product. It also come in a spray can.
Here is a version that you brush on.
https://www.amazon.com/MG-Chemicals-..._&dpSrc=detail
The aquadag falling off the CRTS of RCA sets of that era is common, I've got one or two sets with that problem.

Thermistors frequently go bad. The fact that your's is unplugged might mean there is other problems.

Hows this set doing?

SR

Nada????