T400 LCD Inverter Questions

Hello Everyone
I'Ve got a few questions about the LCD Inverters. First of all: 
Is there a difference between 41W1479 and 41W1478? There must be, because they are different numbers, but wherein lies the difference?
Secondly, I've built in a 41W1478 card where there was a 41W1479 before. Had lots of flickering in the first try, then re-installed the card, and after that, it stopped working completely. Any idea on what i did wrong?
Looking forward to your answers

The inverter that was inside before didnt work (screen was all dark), the new one was flickering. Then i turned it off, re-connected the inverter, and when i turned it on again, the screen was all dark as well...
Are you sure its the motherboard? because replacing an expensive part isn't really the solution i was hoping to find, tbh

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