Regarding the dim problem of the NV-E6GCP, it is because the life of the OLED has expired, and it can be solved by replacing the OLED display. But this 1" OLED has been discontinued, there are almost no replacement screens on the market.
I can provide maintenance services for NV-E6GCP-UK and NV-E6GCP-DC. (It is not recommended to solder by yourself, because this OLED‘'s distance between PIN and PIN is too close, it is easy to damage the PIN during soldering, and it is easy to tear the PIN after soldering)
All you need to do is remove the screen from the wall mount,and then send them to me by express, and I will send them back to you after the repair is completed.

Notice:

Considering this OLED is not easy to solder and avoid OLED damage caused by soldering, this product only provides maintenance services, and the screen is not sold separately.