I have an 820-3437 that had some liquid damage. I have replaced a few components and now have normal behavior (fan-spin, image, proper rails, etc). Only issue is that backlight starts out at about 25V and slowly drops down to the non-boosted voltage as I measure it. I've tried multiple screens, and I replaced LP8550. I confirmed that the feedback line has continuity from Pin 5 on LP8550 to the other side of the board near D7701. Any thoughts? Thanks!