No display backlight the system works otherwise

I have a 27 5k 2015, no backlight on screen.

Changed the screen, exactly the same issue. Can see lcd working with torch in both and external ok. I doubt if two screens backlights would fail, is there a fuse on the logicboard?? I can't find anything. 3 leds on, not forth. Any ideas? Thankyou

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Lets backup here you replaced the screen? This person didn't. There issue is likely a power supply problem and/or the Voltage Regulator Module (VRM) on the logic board.

From what you describe you have a backlight issue.

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