Blue Light Fading Issue

Having the same Blue Light Fading issue. I have read a few threads about how to "hopefully" resolve that issue.

Reseated and rechecked all the connections inside the gamepad to make sure nothing was loose.

From the threads, I'm reading the issue is caused by a faulty LCD screen, or a bad motherboard.

From where is everyone purchasing the parts, if someone may provide the link please and thank you.