In Samsung Galaxy S6 Edge G925F Display is connected the the motherboard with a cable connector. If your LCD is not working, you obviously have to check if a faulty LCD is not causing this problem. If the LCD is okay then check the LCD connector.
If you ever already been tried to replace a new replacement LCD screen and new flex cable wire and notihng happens but the display problem still exists like, black screen display, blue screen display, white screen display, garbled and saturated screen display.
Before you may proceed, you need to make sure first that the flex cable and the LCD is working fine or you have it tried with new replacement installed but nothing happens.
Note: this solution covers only for hardware repair and may not help on software related issues.
Check and clean the LCD pin connector, for possible damaged and oxidation build up. Trace each corresponding LED connection down to a components where it is connected, check also and then replace that components if found damaged.
To fix the display problem, you may first try to replace or install a new LCD screen module, to easily confirm if the LCD’s backlight LEDs were still working or already damaged.
You can also check the LED’s using the multimeter if you can manage without damaging the LCD flex connector.
If the newly installed LCD still shows the same problem and the LED light doesn’t light up, refer to the solution below and locate the highlighted components on the PCB board.
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Samsung SM-Galaxy S6 Edge G925F LCD Display IC Solution Jumper Problem Ways LCD Display Not Working