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First of all, thank you for your prompt answer. would guess that it is a gentle attempt of "planned aging of the product", as all other components on board are rather good quality, so is the design and the board itself. good point, not sure though if 3.3V VRs would survive it, as LV...

Bought a second hand DS-7216HGHI-SH. Was told that just power adapter is missing. I have added regular 12V DC socket in parallel, so I can use standard 12V connector. In process I have noticed that all four 470u/10V caps were swollen, so replaced all caps just in case. On board battery CR-1220...