ART Tube MP might be easily fixed
Check the tube and the power adaptor - I bought mine "as-is" for near zero with a dead adaptor
DO NOT open that thing up unless you want to deal with fragile ribbon connections that WILL break on you at least twice. I opened one up once before selling it and It took 4 hours to get it back together! I wan't sure if I would make the sale.
On the other hand, perhaps broken ribbon connectors IS your problem...
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