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The Lenovo Z70-80 was released in September 2015 by Lenovo, model number 80FG00DCUS.

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*Z50-75 not Z70-80* Computer turns on, but black screen, fan runs fast

*No option for Z50-75 so I had to choose Z70-80*

I’ve had this problem for a couple of years now, either I’ll try to fix it or sell it but I just can’t seem to find the reason for this happening.

Problem: I tried turning on my Lenovo Z50-75 one day and all I would get is a black screen and the fans running really fast, blowing out a lot of air. I’ve tried multiple things but had no result.

I know that there nothing wrong with the screen because when I would turn it on previously the webcam light (the LED which would turn on when the webcam was active) would blink at startup but now with it doing this it doesn’t turn on at all, I just get a non-working black screen with a two second pause before the fans go turbo mode.

I’ve tried;

- Switched out each RAM sticks before completely changing the RAM sticks

- Taking out the battery and just using the charger to turn it on

- Plugging in HDMI into an external TV and then monitor

- Letting it charge for at least 10 hours with it running, then leaving it to charge without it running

- Changed the HDD multiple times with different Windows/Linux operating systems

- Format HDD to try reinstall Windows on the original HDD

- Hard restart the laptop - take battery/charger out and keep the power button pushed for 30 seconds

- Taken out the fan and given it a good clean

If I don’t hard restart it then when I turn it on, it would straight away turn on the fans but if I did a hard restart it then it would wait 2-3 seconds before the fans came on and maybe give it a chance to come on.

Sometimes in the past, if I hard restarted it, it would turn on occasionally but it would be very slow and crash after an hour or so of usage then it would repeat with the fans and black screen problem. If I sometimes mess with it by changing around the RAM sticks it would sometimes work but now it doesn’t do that anymore

I’ve had a problem trying to the back frame off after unscrewing all the screws. I’m afraid if I try anymore it’ll most likely break so I can’t get to anything inside, I wanted to try change the thermal paste but I can’t get into it. I just have access to the battery/wifi card/RAM/HDD/fan

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Opties

Hi,

Try a full power refresh by removing the RTC (Real Time Clock) battery from the motherboard as well and check if it resolves the problem.

I realize that you have removed the battery and held the power button operated for 30 seconds but sometimes it takes a bit more to restore the BIOS to its default settings. Also it may seem a bit over the top but it may come down to having to try it as nothing else seems to have worked

Here’s the procedure:

Disconnect the charger if connected.

Remove the main battery from the laptop.

Dis-assemble the laptop so that you can remove the RTC battery from the motherboard.

Here’s the hardware maintenance manual for the laptop. This will help you to gain access to the motherboard. (see p.54) You don’t have to remove the board just dis-assemble enough to access it

Here’s an image of what the battery looks like and where it is located on the motherboard which may help. It appears that it is soldered to the board so be careful when removing it and remember the orientation for when you go to put it back. When it is out use a voltmeter to check the battery voltage. If it is <2.6V DC replace it

Block Image

(click on image to enlarge for better viewing)

Press and hold the power button for a full 30 seconds.

Replace the RTC battery (remember the orientation!)

Reassemble the laptop and reinsert the main battery.

Connect the charger and try to turn it on

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Killinq zal eeuwig dankbaar zijn.
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