Hi @royalflush26831
Has the laptop been dropped or gotten wet at all?
Try connecting an external monitor (TV?) to the laptop's HDMI port and view the display from the laptop on the monitor and check if it flickering as well or is stable. Don't forget to press the F7 key (or Fn + F7 keys) to toggle the display output between the laptop and the external monitor.
If the monitor display is OK it could either be a faulty/loose EDP cable connection (either end motherboard or LCD panel) or a faulty LCD panel.
With the display showing on the laptop screen, try moving the lid slowly, very slowly back and forth and check if this affects the flickering at all e.g. stays the same, worse, stops.
If slowly moving the lid affects the flickering, then most likely its a cable problem e.g. loose connection or damaged where it passes through the hinge to get from the motherboard to the LCD panel in the lid
If slowly moving the lid does not affect the flickering it still could be the cable or the LCD panel.
Here's the maintenance and service guide for the laptop.
Go to p.76 (82 of 109 pdf) to view the procedure to remove the LCD panel. This will allow you to check and inspect the EDP cable to see if it is securely connected and not damaged and also to replace the LCD panel if necessary.
If the monitor display is also flickering, then there's a problem on the motherboard and the schematics would be needed to find out what's wrong.
When the laptop is open also check if you can pinpoint where it seems to be getting hot as this may help to narrow down what may be a problem.