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andefoo
Paper Tape
Posts: 2
Registered: ‎07-19-2016
Location: FI
Views: 1,237
Message 1 of 4

IdeaPad Yoga power button not working (?)

Specs: Lenovo IdeaPad Yoga 11.6" HD/Core i7-3689Y/4 GB/128 GB

 

All is fine when the machine is on or in sleep mode. The problems start when it shuts down or goes to some deeper hibernation (whatever happens when the machine has been in sleep mode long enough). Then, the machine won't start up anymore, even if the power is connected.

 

After some googling, we decided to try to disconnect the battery. This didn't help (and there was no BIOS update for this particular model) but while disassembling the machine we found out that when the front panel (power button + power light) motherboard connection was detached, the machine powered up. All was again fine until the machine shut down. So the machine can be jump-started by detaching the cable but either the front panel circuit or connection seems to be broken.

 

Any ideas what to do?

 

The following picture illustrates the issue:

 

lenovo_yoga_problem.jpg

 

 

Sr Support Specialist
Posts: 9,501
Registered: ‎11-30-2015
Location: PH
Views: 1,213
Message 2 of 4

Re: IdeaPad Yoga power button not working (?)

Hi andefoo , 

 

Welcome to the Community Forums. 

 

WOuld you have the machine number (check on the machine number from the sticker or check it from here ,just keep your serial number confidential) based on the image that it would look more of a Yoga 11s  instead of yoga11  which have different structure specially with the power board. 

 

WIll it turn on if you use the Novo button instead of the power button? If same non powering issue probable point of failure would be both on power cable and board that needs to be check. You can have it sent for repair or if you have the tools and skill to use the hardware manual  (yoga 11s) for the guide along listed is the FRU number if needed , 

 

Update us how it would work best for you. 

 

Regards



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andefoo
Paper Tape
Posts: 2
Registered: ‎07-19-2016
Location: FI
Views: 1,203
Message 3 of 4

Re: IdeaPad Yoga power button not working (?)

Yes the machine is actually Yoga 11s, thanks for noticing it!

 

Using Novo button doesn't help either. It seems that after keeping the machine in sleep mode long enough, the only way to get it back up is to remove the keyboard and detach+attach the cable in picture.

 

So if I understood correctly, based on this information, what could help would be to replace either VIUU4 Power Board FFC (90202814) and/or its cable (e)? Would it make sense to narrow down the suspect by using the other cable that looks about the same (rotation cable (f)) to see if the power problem goes away that way, or are they incompatible? I guess the problem could also be on the motherboard side?

 

On the other hand, it just turned out the machine still has some warranty left so the sane solution would of course be to just send it to service. The problem with that is that it can take weeks and I was not sure whether it can be repaired. But I assume now that fixing this should be quite straightforward. 

 

Sr Support Specialist
Posts: 9,501
Registered: ‎11-30-2015
Location: PH
Views: 1,198
Message 4 of 4

Re: IdeaPad Yoga power button not working (?)

Hi andefoo , 

 

Greetings. 

 

I would encourage you to give technical support a call and use the current warranty coverage as like you hyphothesized on your isolation and even using the novo key , possible points of failure may be the power cable , power board and systemboard that needs to be checked. 

 

As we suspected as the a non software /firmware issue but more of a mechanical contact failure , best to have it arranged for service as the warranty would cover both parts and labor. 

 

Regards



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