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winemuse
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Posts: 19
Registered: ‎12-08-2016
Location: US
Views: 664
Message 1 of 4

Yoga 900, power lights on, black screen, Tried everything. Replace motherboard, CPU, memory?

Would love feedback here. 

 

Power lights are on, screen is completely black.

I've read other reports of this in the 900 and other Yoga models but 

I've never seen the solution Lenovo support offered. 

They said it was hardware issue, a no power-on-start issue.

This is a newish computer. 

 

What do you think the issue could be?

Pressing power button for 1 minute has no effect.

Using One-key recovery, no effect

F9, increasing brightness, has no effect.

 

Black dead screen, I've tried all my tricks. 

Nothing has worked. 

Sr Support Specialist
Posts: 9,643
Registered: ‎11-30-2015
Location: PH
Views: 636
Message 2 of 4

Re: Yoga 900, power lights on, black screen, Tried everything. Replace motherboard, CPU, memory?

Hi winemuse , 

 

Welcome to the Community Forums. 

 

Confirming a no post issue as differentiated from no display (no faint image , no display even on external) , function keys not working even with caps / num lock , no beeps codes without memory , no harddrive or any external devices, no splash screen , no BIOS access all points down to for a possible systemboard issue else CPU / graphic chips etc all essential for a good POST.

 

More the reason to have it sent for in-warranty repair service thru technical support

 

Update us how it goes on your end .

 

Regards



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winemuse
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Posts: 19
Registered: ‎12-08-2016
Location: US
Views: 620
Message 3 of 4

Re: Yoga 900, power lights on, black screen, Tried everything. Replace motherboard, CPU, memory?

Hi, Spidey, 

 

I'm going to attempt to translate your post since I'm not quite understanding all your tech language,

and I think others may be confused as well if they don't speak computer-ese.

 

Please correct my translation as needed. I'm using normal consumer language

to make sure I understand you. 

 

You are differentiating from Black Screen that is a hardware Issue from

a Black Screen that is the result of other issues.

 

A Power On Self-Test (POST) Failure means the screen failed to work

even after using the power button held for 1 minute.

I've also tried using the caps/locks and function keys to make sure the black screen

is not the result of the brightness beng dimmed.

Also, all external hard devices and USB connections have been disconnected.

There is no splash screen, no access to BIOS, and no display even when

device is attached to another monitor via HDMI.

 

Yes, all true. 

 

You're saying this means a hardware failure of the motherboard (systemboard?)

perhaps with CPU and/or graphic cards issues.

 

I'm guessing systemboard means motherboard

and graphic chips refer to the chips on a graphics card.

 

In which case, those parts need to be replaced. 

 

Just want to make sure I understand, and that this is clear.

 

Thanks.

 

 

 

 

 

 

 

Sr Support Specialist
Posts: 9,643
Registered: ‎11-30-2015
Location: PH
Views: 612
Message 4 of 4

Re: Yoga 900, power lights on, black screen, Tried everything. Replace motherboard, CPU, memory?

Hi winemuse  , 

 

Greetings. 

 

Was just thinking the way you describe the symptoms like a hardware tech , and you got it all correct.

Solid white led on the power , a non LCD issue for the black display , no lenovo screen and non responsive caps lock or function key are typical to a no post issue (power on self test).

 

Not immediate replacement of motherboard but perhaps isolate in those areas that can be best confirmed by service technicians (cleaning the heatsinks and fan, reapplying thermal paste etc , checking hot spots , inspecting CPU). 

You may have some warranty coverage on this so in warranty repair would have it all covered either thru sending or carry in to nearby Best Buy pc tech. Chat support is also available. 

 

Thanks for the clarification.

 

Regards



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