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4 Posts

10-25-2020

United Kingdom of Great Britain and Northern Ireland

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Lenovo Z50-70 not booting - only power/battery LEDs on

2020-10-25, 18:49 PM

Until yesterday the Z50 was working normally.

Today I tried to switch it on and I'm not even able to get to the Lenovo logo.

 

It's like it is trying to boot, some kind of noise is coming from the HDD or the fan (cannot say for sure) but it last just one second and then it fully stops.

The LEDs for power and battery seem to work properly though (the battery turns off when unplugging the power and on when plugging it).

Keyboard is fully unresponsive (no startup lights shown, caps-lock LEDs doesn't toggle). As said above, the Display is always off.

 

The only way I can see the motherboard is at least trying doing something are the LEDs on the front panel.

Interestingly, when the system is ON (according to power LED) it gives a single loud beep plugging the power in or out (it produces the same beep on both directions).

 

I tried already:

  • boot without battery pack
  • boot with battery pack
  • boot to BIOS with side NOVO button
  • CMOS battery reset procedure

 

Nothing had any kind of effect.

 

Any more things to try?

Running out of ideas here. Starting thinking the motherboard could be cooked, but don't know how it may have happened.

 

I've seen similar problems in the forum, but no clear suggested resolution.

A person suggested to ground the device (apparently the device was statically charged), but how to do it? The wall-plug I have already have ground, so don't see the point here.

 

Any suggestion is welcome.

 

Thanks

 

D

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12665 Posts

11-30-2015

Philippines

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Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2020-10-26, 9:28 AM

Hi davege,

 

Welcome to the Community Forums.

 

I would usually remove the harddrive after the battery.

 

First thing is to check if the machine would POST.

 

Then try to remove the memory, using one ram at a time then to swap it later.

 

Use the Novo button to turn on.

A good POST should show a display with the Novo Menu and BIOS set up and keyboards working.

Num lock and caps lock should also work with its led.

 

If still the same then you can decide to have it checked with the local service center near you.

 

I hope this helps answer your query.

Update us how it goes.

 

Regards

 



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4 Posts

10-25-2020

United Kingdom of Great Britain and Northern Ireland

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Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2020-10-26, 21:32 PM

Hi @spidey101 ,

 

thanks for your reply.

 

I removed the bottom cover of the laptop and this is what it looks like:

 

Tonight I tried to:

 

  • boot with NOVO button after removing HDD
  • boot with NOVO button after removing RAM
  • boot with NOVO button after moving RAM into the second slot

 

Unfortunately with any of these scenarios, I managed to change the behaviour of the laptop.

Nothing is shown on screen in any case and keyboard is not responsive.

 

I also tried to push the NOVO button without the bottom cover and noticed the fan is spinning for around a second before switching off completely.

Didn't notice any other clue.

 

Do you have any other suggestion?

 

Thanks,

 

Davide

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12665 Posts

11-30-2015

Philippines

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Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2020-10-26, 21:50 PM

Hi davege,

 

Next thing to do is have a service center check on this if they would suggest board replacement or if there is anything else that they can do if they would be able to perform board level troubleshooting.

 

Part of which is to also test both rams on a different machine just to prove that it is not the memory stick.

 

They may also be able to try cleaning the fans and reapplying thermal grease to the heatsink components before testing the board.

 

Regards

 



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4 Posts

10-25-2020

United Kingdom of Great Britain and Northern Ireland

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  • Message 5 of 8

Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2020-10-26, 22:50 PM

Hi @spidey101 ,

 

thanks again.

 

Just a couple of more questions:

 

  • when you say board tests/replacement you refer to the motherboard, right?
  • If you see the picture in my configuration I have only one slot RAM used (the component is 8GB) - is it normal to have a free slot?

 

D

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12665 Posts

11-30-2015

Philippines

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  • Message 6 of 8

Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2020-10-27, 14:55 PM

Hi davege,

 

Greetings.

 

Yes. If all other accessory parts like ram would be tested working then it only leaves the systemboard/ motherboard.

 

Some service centers may have capability to perform board level mapping on the possible points of failure to avoid full replacement.

 

I hope all works out for you.

 

Regards



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1 Posts

03-30-2021

Czech Republic

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  • Message 7 of 8

Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2021-03-30, 20:46 PM

Hi Davide, did you make any progress with this problem? I have the same Z50-70 laptop with the same or very similar issue. The laptop takes hours to get to POST (I generally leave it overnight to turn on), during which time the power, battery and Num Lock lights stay on, but it seems to work fine once it gets to POST. It goes to sleep and wakes from sleep as quickly as normal.

 

I've tried removing the following components, with no improvement:

  • Battery
  • Hard drive
  • DVD Drive
  • RAM
  • Wifi card
  • Keyboard
  • Touchpad
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4 Posts

10-25-2020

United Kingdom of Great Britain and Northern Ireland

4 Signins

15 Page Views

  • Posts: 4
  • Registered: ‎10-25-2020
  • Location: United Kingdom of Great Britain and Northern Ireland
  • Views: 15
  • Message 8 of 8

Re:Lenovo Z50-70 not booting - only power/battery LEDs on

2021-04-05, 14:57 PM

Hello,

 

in my case POST phase was never reached, so probably that's something different.

 

In the end, as I expected the motherboard was cooked, so I decided to move on and buy a new laptop...

 

Good luck with your issue, but I suggest you ask for an investigation on the power rails of the motherboard.

 

Thanks,

 

Davide

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