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Old 02-03-2017, 05:37 PM   #1
spintop
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Default Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Hi

My Lenovo Yoga 2 Pro cannot turn ON. The power Led light and keyboard flashes every 5 secs.
I search the website, found that its a common problem with this laptop.
Tried all the fixes but still it doesn't help. I removed the battery, cmos battery and hdd, power it on, still the same.
could be a mainboard issue??

Anyone can help ??
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Old 02-06-2017, 12:30 AM   #2
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Anyone can help ??
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Old 02-06-2017, 06:52 AM   #3
ciki
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Have few of them same issue ,replaced battery charging chip BQ735 i think ,but firs check bios if u can reprogram
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Old 02-06-2017, 10:44 AM   #4
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Laptop can't boot at all so cannot reprogram.
Do I have to remove the bios chip and reprogram it outside ?
Thanks !
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Old 02-07-2017, 07:24 AM   #5
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

hi ciki

i managed to reprogram the winbond eprom with 8Mbytes bin file, by wiring the contacts out.
but the result is still the same, blinking keyboard backlight.

I also found an EC file, which chip do i need to program this to?

Thanks

Last edited by spintop; 02-07-2017 at 07:26 AM..
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Old 02-08-2017, 07:49 PM   #6
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

does anyone has the dump file ?
thks
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Old 02-08-2017, 08:34 PM   #7
RJARRRPCGP
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

You said "cannot turn on", but I had an HP CQ 61 that had a keyboard light blink much like that.
I would get fan and drive power. Seemed it was reporting a CPU failure...
Same board manufacturer???
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Last edited by RJARRRPCGP; 02-08-2017 at 08:35 PM..
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Old 02-08-2017, 08:42 PM   #8
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Quote:
Originally Posted by RJARRRPCGP View Post
You said "cannot turn on", but I had an HP CQ 61 that had a keyboard light blink much like that.
I would get fan and drive power. Seemed it was reporting a CPU failure...
Same board manufacturer???

yes when plug in ac adapter, the keyboard backlight flashes every few secs, blank screen. i can feel the fan is also turning on and off.

maybe u are right it could be a cpu failure, i also cannot be sure.
i also cannot find the schematic, to measure the voltage rail
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Old 02-09-2017, 07:21 PM   #9
RJARRRPCGP
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Quote:
Originally Posted by spintop View Post
i can feel the fan is also turning on and off.
In my case, it would turn on and stay on, including the fan... Just nothing else would happen...
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Old 02-10-2017, 07:03 PM   #10
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

i noticed that when i just plugged in the ac adaptor (with battery removed), without doing anything on the on/off button, the keyboard backlight flashes on and off immediately.

maybe this is not normal, something is resetting itself.
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Old 02-15-2017, 06:40 PM   #11
ciki
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Quote:
Originally Posted by spintop View Post
i noticed that when i just plugged in the ac adaptor (with battery removed), without doing anything on the on/off button, the keyboard backlight flashes on and off immediately.

maybe this is not normal, something is resetting itself.
Try replace battery charging chip ,had 2 off them same symptoms
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Old 02-15-2017, 07:40 PM   #12
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

Quote:
Originally Posted by ciki View Post
Try replace battery charging chip ,had 2 off them same symptoms
i cannot find the chip u mentioned on the board. can u point to me location of this charging chip in image.
thanks
Attached Images
File Type: jpg IMG 1.jpg (531.9 KB, 85 views)
File Type: jpg IMG 2.jpg (595.3 KB, 88 views)
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Old 12-07-2017, 03:27 AM   #13
tlh
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

bios i have the same problem.
Is there a bios to send
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Old 12-08-2017, 06:42 PM   #14
spintop
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Default Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec

mine laptop is still not possible to fix yet.
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