Replacement for NT20M-DF121-V1

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We have a old NT20M-DF121-V1 HMI with a NT20M-LK203-EV1 interface module. The power supply board burnt up pretty bad so looking for a replacement unit. I have looked on Ebay for some time now and have not been able to locate one. There are lost of very close part numbers but None the same. Ive also tried to find what the different part numbers mean so I could see if one of the ones on ebay would work but ive spent hours trying to find that info. If anyone could give some advice i would really appreciate that

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Yes I saw that, Thanks. I would not pay that price for another obsolete HMI. I would put the money towards updating with a modern controller. 

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