Matsushita with lots of Green

jayleone

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Looking for some help on this matsushita issue. I have a 19" matsushita tube and chassis (TM-220) that is over saturated with green. I've tried adjusting the G-Contrast (R324), but it did not make much of a difference. So I started looking for the green drive. I noticed on the neck board the B-drive pot (R363) and R-drive pot (R364), but no green drive pot? I checked the schematic and still can't locate it. Any ideas? Is it possible it may just be the tube and not the chassis at all?

Also, are there any Wei Ya (or other universal chassis) that work with a Matsushita tube?

Thanks for the help!
 
i almost guarantee its got a tube issue. however if you could pul the green transistor just to verify, that would tell you for sure. (as in pull the transistor, if green is still on, then tube is shorted)

i got one here, same damn story. Havent dug back into it but im 99% sure its a tube issue.

I dont know for sure if 8 liners or the like offere a weiya chassis for that tube, as its kind of an oddball one.
 
sounds like a tube issue to me too, all too familiar with those now. :(

if it helps to know any for future reference, some monitor manufacturers combine 2 primary colors on the drive controls into one knob. Red's usually a standalone and they'll combine the Green and Blue ones.

I know Wells-Gardner does this, and some manufacturers will separate all 3.
 
I don't think they're combined... but they fix green, and you can adjust the red and blue to match the green. You adjust green by tweaking the overall brightness, and bringing the other colors to the green level.

DogP
 
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