I can't say I've ever seen the socket go bad. But, I have had to disconnect, clean with contact cleaner and reconnect before. You have to be really specific with your testing. Any pushing you are doing is flexing the entire board and screen. This is either the cable or screen and based on your comments Id say the screen.
This Dell Inspiron 15 (3521 / 5521) video repair tutorial was brought to you by http://www.parts-people.com SHOP FOR DELL INSPIRON 15 (3521 / 5521) PARTS: LC
On looking through the forums i came upon some tests to isolate the problem. I tried: 1. The LCD BIST (Built in self test) : Passes. All colors are displayed with no distortion of any kind. Crystal Clear display. 2. Connect Laptop to an External Display : Pass. I connected to a VGA Monitor.
Thank you Mike l will try to buy a new LCD screen becourse l insert the LCD connector for many times but nothing is working. Apr 3, 2020 by Elton Makombe @ellomax The most common and simplest reasons that a computer monitor is unable to display a screen image include: (Select 2 answers) -Wrong input selection. -Loose cable connections. A user's Android 7 phone has been crashing and they complain that their data usage has gone way up although their phone habits haven't changed. The Solution: Dead pixels and lines cannot be easily repaired and the LCD screen or LCD screen ribbon cable should be replaced. A Flickering Screen: Flickering screens are usually caused by inconsistent power. The LCD inverter, which supplies power to the LCD screen's florescent light bulb, may be failing. When the LCD inverter starts failing
It's gotten progressively worse too. Now, even slight movements will trigger the problem (i.e., the cushion that it sits on shifts as I get up). It seems to be related to the hinges where the LCD connects to the laptop. Movement at the hinges produces the most striking effects. I'm guessing that it may be the LCD cable, but I'm not positive.

7. Change The Sharpness Settings. Virtually all modern HDTVs offer a form of digital sharpening. This is usually listed under TV settings alongside contrast, brightness, etc. Use your TV remote control to access those menus, usually by first pressing the menu button. Lowering the sharpness level will soften the image.

Connect any peripherals to the display device. Connect the display device and computer to AC power. Turn on the computer and the display device. If you are not using an HP monitor, select the correct video source on the monitor, projector, or TV. For example, if you are using an HDMI port, set the source to HDMI.
I've disassembled the laptop and removed the screen to check if the cable was loose, but it's not so I think the cable might be broken. This problem first occurred only a few months after I bought it, but it happened super rarely and it usually just went away if I pushed the screen down a little bit while it was open standing in an upright
Problem #1 – Display toggle. Laptops have multiple display modes. The four most common are: 1) laptop display only, 2) external display only, 3) duplicate the laptop display on the external display, and 4) extend the laptop display onto the external display. The computer may not be in a mode that displays the presentation on the external
\n laptop lcd cable problems
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    • laptop lcd cable problems