This is ringing a bell. Wasn't there a thermisitor that would go bad causing this behavior??

Are you referring to the degaussing circuit?
It could be.
Max.

 

But it would be wise to take it to a tv repair shopn't find paperwork.

You are kidding right? Where are you going to find a TV repair shop today?????? Even if you could find one, who do you think would still be around that could repair this thing???


Besides there is no fun in taking it to the shop anyway.

 

Are you referring to the degaussing circuit?
It could be.
Max.

Yes! That is where it was! Good memory!

 

See if you can pull an arc off of the anode cap on the horizontal oscillator.

Or you could do it the safe way and look for a horizontal line. Oh! Wait a minute, we've already know we have got one of those.

 

Hello,

As it is a b&w television, it will not have a degausing coil.
Check for the connections of the deflection coils.

Bertus

 

Are you referring to the degaussing circuit?
It could be.
Max.

As this is a black and white TV and it won't have a degaussing coil. It is only necessary with (colour) shadow mask tubes.

 

Didn't realize it was B&W.
Mea culpa.
Max.

 

What test equipment do you have?

 

Hello,

As it is a b&w television, it will not have a degausing coil.
Check for the connections of the deflection coils.

Bertus

Maybe I missed it but I don't see any place the TS mentioned a B&W set. It is a 1980 TV. In the US chances are it would be color but could still be B&W. OP mentioned a "white dot". That does not necessarily mean it is B&W. Sounds like it is a portable TV (TS calls it a "travel TV"???? never heard that term before) if it is a portable TV with battaeries then it could be B&W.

 

TS did include this link

http://www.radiomuseum.org/r/yoko_f_3.html

Looks like a portable. Does not mention B&W but bet it is.

 

Looks like a transistor set too so much for my idea of testing the horizontal output tube.

 

TS did include this link

http://www.radiomuseum.org/r/yoko_f_3.html

Looks like a portable. Does not mention B&W but bet it is.

From that link:
Notes TV-FM/AM Receiver, Stereo Cassette player; 5" b/w TV with VHF-/UHF tuner, AM/FM radio, telescopic antenna, 3.5 mm terminals for ext. speakers, ext. antenna in, earphones. Made in Korea.

 

I searched a couple of Sams sites. No luck with Yoko Electronics.

 

Attached is a schematic of the Yoko F-1 from here. Reportedly the F-1, F-2 and F-3 have TV, TV + radio and TV + radio + tape respectively. The TVs in each are said to be similar or identical.

 

Attached is a schematic of the Yoko F-1 from here. Reportedly the F-1, F-2 and F-3 have TV, TV + radio and TV + radio + tape respectively. The TVs in each are said to be similar or identical.

Who where did you find that baby? Now id we can only get the TS to chime in.

 

This is a start, ive marked all the main 12V dc feeds in red. First checks should be R601 & TR601 in the powersupply, either one of these could cause low voltage, & check for faulty / leaking electrolytic capacitors.

 

well, thanks all, i might do the visual inspection today, or its gonna be in the weekend

 

Well.. opened it up, but thought it would be a bit less chaotic and less wires all over the place

 

Looks a lot like in the picture

 

There is this one screw that i cant reach with a screwdriver, 3 cm above the screw there is another circuit board