Why is the device power on but the screen does not switch on
When powering the device, the screen does not show anything and the device is on at the time
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if the device appears to boot up and run - based on the LED activity - then you either have an internal loose/bad cable connection, bad screen or driver/display module
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It may help diagnose the issue if you can try an external monitor and see if there's a picture on that. That should separate the issue from a GPU problem vs. an LCD display defect.
- de Jerry Wheeler