4" Flat BW CRT , can't flip image vertically

[HelloVoltage]

I have experience in this matter from repairing a few arcade cabinets with reflectors.
Please provide all available information on the crt, and the video source.

Welcome to videokarma.

[samu]

Originally Posted by HelloVoltage

I have experience in this matter from repairing a few arcade cabinets with reflectors.
Please provide all available information on the crt, and the video source.

Welcome to videokarma.

Thank you,

The video source is composite, coming from a Nintendo Wii.

It's hard to find information on these, it seems like there are many variations of these Chinese versions of the 04JM Sony tube.

My CRT is marked model no. YC-103A, but nothing comes up online for that.
Most other images I find online have their board marked with either Sony or Tosho, mine only says YC-103 with no manufacturer name.

Here's a site that has a lot of information on similar products. ( https://geeseang.wordpress.com/exper...lat-4inch-crt/ )

My model has an LA7806 IC controller, which could be important as I believe this is what drives the deflection coils?

Only other information I could find that seems to be from a potential manufacturer is here ( http://www.hanseelec.com/product/vie...CRT-002&ku=CRT ) , but again, not a perfect match to mine.

I'll attach some pictures of it.

[zeno]

I dont know about lolly pop tubes but THINK the beam is scattering &
not hitting the screen directly. On many sets @1975 this could happen
A vert out would short
DC got on the yoke
This caused the beam to shift off the screen & you would get
a dim blank foggy pix. from the scattering. When you turned it off
you would see a flash with a vert problem, either missing the
bottom or top half for a second.

73 Zeno
LFOD !

[samu]

Originally Posted by zeno

I dont know about lolly pop tubes but THINK the beam is scattering &
not hitting the screen directly. On many sets @1975 this could happen
A vert out would short
DC got on the yoke
This caused the beam to shift off the screen & you would get
a dim blank foggy pix. from the scattering. When you turned it off
you would see a flash with a vert problem, either missing the
bottom or top half for a second.

73 Zeno
LFOD !

Thanks for the help,

That sounds a lot like what I have here, but I don't quite understand how simply swapping the vertical coil leads can cause all of this. It works fine if I swap them back to normal.

As for the flashing and missing of half of the screen when turning it off, it doesn't look that way in person. I'll link some videos I took of it both swapped and normal.

Here's the menu sweep with no vertical swap: https://youtu.be/Q9U8DVKnXiU
Here's the menu sweep (it's a little hard to see) with the swap: https://youtu.be/V4hkpaW4GHM
Here it is turning off with no swap: https://youtu.be/FNcV1TAB-LQ
Here it is turning off while swapped: https://youtu.be/_4dOJMq9uhI


Maybe that gives some clues... idk

P.S. If anyone else has a 4 inch flat CRT unit like this that's just sitting around, I would greatly appreciate it if you wanted to try swapping the vertical leads and see what happens.
Just take care to check the resistances between the leads and only swap between leads that have continuity (the higher resistance leads at about 15ohms are the vertical ones).

[zeno]

If you have a scope look at & compare the wave form & DCV on
both swapped & unswapped wires. may be a clue there.

Zeno

[JeffB]

Try rotating the deflection yoke 180 degrees to match the flipped vertical.