Hi @larry767 ,
Just verifying that the Power button board you have is part # [https://www.amazon.com/749650-001-LS-A991P-455MKL32L01-Repairing-Accessories/dp/B07RL5F1CH|749650-001]? Zoom in for a closer look
This is the specified part number for the power button board shown on p.46 of the [http://h10032.www1.hp.com/ctg/Manual/c04886216|hardware and service manual] for the laptop, taken from this [https://support.hp.com/us-en/product/hp-15-g000-notebook-pc-series/6545564/model/7174240/manuals|webpage].
On p.46 you will also find the necessary pre-requisite steps and then the procedure to remove / replace the power button board
What is the board number of the motherboard?
It may be possible to find the schematic of the motherboard by searching for ''(insert motherboard board number) schematic''. Worth a try anyway