HP Envy X360 15-u483CL will not power up.

[WileyWon]

A few days ago, I put my laptop into hibernation.  It seemed to shut down nicely.   Later that day, I pressed the power button, but nothing happened.

The next day, I opened it up and found the power button had broken from the power button board.  So, I purchased a new power button board, part 774599-001 and installed it.    Still, when I press the power button, nothing happens.   No lights, no sounds, no clicks -- nothing.

So, I may have one of these three conditions:
1.  The motherboard failed.  When it didn't power up, I pressed the power button with too much force and that is what broke the button.  Now I have a new button board, but m/b is still faulty.
2.  The power button board that I installed is faulty.
3.  I somehow caused a new issue while I was working on it.

I have tried draining power, starting without a battery, and holding the Windows-B keys.  Nothing has helped.

What should I try next?
Does anybody know which of the 6 pins in the power board cable can be shorted together to start the computer?  If that works, I will know that the power button board is bad and the system board is good.

[erico]

The part number of the power button board should be 830190-001. The one you installed may have been a superceded part number. The HP PartSurfer is more accurate than the Maintenance & Service guide.

You may have inadvertently purchased and installed the wrong part. I see the part number you used in the Maintenance & Service guide. http://h10032.www1.hp.com/ctg/Manual/c04642245.pdf

Reference source. HP PartSurfer data for your notebook. See the hyperlink below.

https://partsurfer.hp.com/partsurfer/?searchtext=M1W62UA&searchby=product

[WileyWon]

Well, now I am thoroughly confused.  The part number that you specified is listed as "No longer supplied" on HP PartSurfer.  What does that mean?   I can no longer get it directly from HP?  I will have to find another source?

Here is a link that includes 6 pictures that exactly depict the part that came out of my laptop:

https://www.cpumedics.com/hp-830190-001-32y62pb0010-power-button-board-for-hp-envy-x360-15-u473cl-u4...
You will notice that it has only 1 hole, 1 large slot, and 1 small slot on the opposite edge.

Also notice that the seller is calling it a part  number 830190-001, just as you said it should be.

The part that I actually purchased from an Amazon seller might be a 774599-001, but it did not physically fit into my laptop because the holes did not line up correctly.  You will notice that it has three holes.  It will not physically fit into my laptop without modification.  I expected it to work electronically, but we still do not know why it didn't.
https://www.amazon.com/gp/product/B07VVC7NM7/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

I do not believe the part was superceded by a newer part.  More likely, the opposite is true.  I am convinced that the Maintenance & Service Guide was just flat wrong.  The same document specified the CPU as an i7-5500U in one place and an i7-6500U in another section.

So, I guess I need to launch an all out search for the correct part.   
I hope I can find it for under $100 and it will probably be used.

I would still love to know which two wires from the power board to the system board can be connected together to start the laptop.  That would be a definitive test to determine which of the two boards is at fault.   
Do you know where I can find a schematic diagram for the system board?

[erico]

I found it at a number of online vendors at the hyperlink below.

https://www.google.com/search?q=HP+830190-001&rlz=1C1CHBF_enUS918US918&oq=HP+830190-001&aqs=chrome.....

Schematics for notebook system boards are difficult to come by unless you happen to be in the notebook or PC repair trade,

[WileyWon]

I spent a few hours searching over the weekend and came up with the same results that you did.
You'll notice in the results that some boards have 3 holes and others have 1 hole, 1 large slot, and 1 small slot on the opposite edge.
There is a ton of confusion and misinformation out there.   The same pictures and part numbers are associated with both boards.
The 3-hole variation is easy to find on Amazon or eBay for $13 to $25.
The 1-hole version is near impossible to find and can cost between $50 and $250 in condition "refurbished".
Both versions are stamped "DAY62PPB8B0 Rev B" on the PCB.  My motherboard is stamped "DAY62PMB8E0" if that matters.
The 1-hole version is what came out of my computer.  The 3-hole version did not work as a replacement.   Even if it did work, it would need to be physically modified to fit into the laptop case. 

I can only speculate about which part number belongs to which version of the power board.
The 3-hole version might be part number 774599-001, aka: B07VVC7NM7
The 1-hole version might be part number 830190-001, aka: 32Y62PB0010
To add to the confusion, both variations are stamped "DAY62PPB8B0 Rev B" on the PCB.

It appears that HP changed the physical characteristics of the PCB and assigned a different part number.
What we don't know is whether they also changed the electrical characteristics. 
I would love to hear from somebody who was able to substitute one part for the other and have it work properly.

So, now I have to decide.  Do I spend $50 for a used part that might not fix my issue?
Or do I perform further testing to prove whether or not the power PCB is actually the reason my laptop will not power up?
What I really need is a schematic that will show me which ribbon connector pins to short together to get the laptop to power up.