Screen backlight not working

I had a liquid spill a while back. I bought a logic board, trackpad and upper case from ifixit and installed it.

After installing these parts I noticed the screen back light wasn't working so I bought a new screen assembly however the backlight still wasn't working with the new screen. With an external monitor hooked up the mba works fine.

I have done an smc and pram reset but still no luck.

I am about to send the logic board back to ifixit as I believe it must be the back light circuit. Anything else to check before I send it back to them? They are saying they will charge me a restocking fee if it is not found to be faulty which I would like to avoid.

btw, prior to purchasing the new screen I was advised on here that it won't be the logic board that is faulty as ifixit doesn't send out faulty parts! Not sure I believe that anymore.

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