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[Blank Screen] LCD Problem or Another Hardware Failure?

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Hello!

I've Lenovo ThinkPad T470 with blank screen LCD.

When I short press Power button, the step is like this:

* Fan is running
* Green LED on Power Button is Light Up
* Keyboard Backlight is Dimmed
* Red LED ThinkPad on LCD cover is Light Up

*

* After a few second:
* Fan is stop
* Green LED on Power Button is still Light Up
* Keyboard Backlight is off
* Red LED ThinkPad on LCD cover is Light Up
* LCD black screen
* No beep sound

[video|4876]

When I long press power button:

* Green LED on Power Button is off
* Keyboard Backlight is off
* Red LED ThinkPad on LCD cover is off
* LCD black screen

I Need Advice

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Lenovo ThinkPad T470

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open