You need to do a flashlight test, Turn it on and hold a flashlight up to the screen. If you can see an image then either the power supply board or the backlights are bad. If you see an image then disconnect the cable going from the power supply board to the main board, If the back lights come on then you need to replace the board. If not then its most likely the backlights need replaced.
I hate to be the one that brings the bad news, but if you are able to find a replacement screen for a tv, the cost would be more than what the tv is worth. The screens are the most expensive part of the tv. At this point what I do is take the boards out and try to sale them.
Go to Menu , Picture, Backlight and vary level (0 – 20) • If no backlight changes observed: Check Panel Connector minus (-) pin voltages and P-DIM voltages while changing backlight level. • If minus Panel voltages don’t change, and P-DIM changes, replace SMPS. • If P-DIM doesn’t change replace Main/T-CON Board. MUTE 4 1 9 EXIT to test Panel Backlight Sections.
Not sure how far you are into this, but to remove the heat sink you will see 4 screws around the end of it and 2 screws farther back towards the fan. Those screws will need to be removed. The will also need to be removed as there is a screw under it also that hold it in place.
I had the same issue with a different laptop and a different ssd, I ended up having to connect it to another computer and go so disk management and configure the drive. Once it was done then I installed it in the laptop and was able to install windows on it. Every thing worked fine after that.
Not sure what really happened here but I was getting ready to order a new screen and home button for the phone, The customer was needing their phone back so I Turned on the on screen home button and showed them how to use it. I put the phone back together with the original home button and everything worked just fine.
First check to make sure the cables are connected all the way, Next I would check each cable for the slightest bent connector or tear in the cable. May have to use a magnifing lens, even a slight wrinkle in the cable can cause damage. If you used any heat to separate the screen you may could have damaged the chip connected to the home button.
If this was bought about 1-2 months ago it should still be under warranty. First thing I would do is go to hp support page to see if it can be fixed under warranty before you replace or do anything else with it.