Backlight for A1278 2.0

Well, I bought a keyboard backlight sheet and installed it. Unfortunately, It does not work. I think I did everything allright. There is a connector on the logic board and I put the strap in it. Does it matter if you put it upside down, this could be the only mistake. Or did I buy a broken one on Ebay? Or maybe, can I test it myself by putting a certain (how many?) voltage on it ansd see if the allumination works?

Who has any advise?

Answer this question I have this problem too

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