Laptop screen is black but touch screen is working.

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Lenovo Yoga 710-14IKB

Lenovo Yoga 710-14IKB は2016年8月に発売されました。モデル名は80V4. 14インチタッチススクリーンコンバーチブルラップトップです。

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Matt Monteverde @mangomonte

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投稿日: 2021年12月9日

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Laptop screen is black but touch screen is working.

My laptop fell off the bed and now the screen stays black when turning it on. There is no visible physical damage to the screen. I have plugged it into a monitor and everything is working including the touch function on thre screen. I have opened the bottom of the laptop and disconnected and reconnected the battery and unplugged and reconnected the display cable going to the motherboard. Should I order a new screen? There doesn't appear to be a backlight for the screen either. Is there any way to see if the display cable is loose without removing the screen?

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jayeff @jayeff 評価: 449.3千 11 366 1.4千 · Answer 1 · 2021-12-10T01:41:21-07:00

Hi @mangomonte ,

Check if you can see any images on the laptop screen when you shine at torch at an angle close to the screen. They will be very faint if they are there so trying this in a darkened room may help to see them

If there are images then no backlights may be due to a signal voltage not being received on the dispoff# lead on the eDP cable connector (see pin 5 on eDP connector image below).

You could always check if there is power on the +LEDVDD inputs (see pins 1 &2). Backlight power is always supplied to the LCD panel and it is turned on and off in the LCD panel by a signal voltage on the dispoff# lead.

If the LED power is there and if the dispoff# lead has a signal voltage (3.3V DC?) you may have to check the eDP cable connection on the LCD panel.

Here’s the hardware maintenance manual for the laptop. Go to p.48 to view the necessary pre-requisite steps to remove the LCD unit, so that you can check the cable connection.

Also maybe check the sensor board connection in the lid. The sensor board signals (see pin 26) when the lid is closed and this causes the backlights to be turned off. (see p.59 in the manual).

(click on image to enlarge).

Hopefully this is of some help.

Lenovo Yoga 710-14IKB

Laptop screen is black but touch screen is working.

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