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-   -   Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec (https://www.badcaps.net/forum/showthread.php?t=60131)

spintop 02-03-2017 05:37 PM

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 ??

spintop 02-06-2017 12:30 AM

Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec
 
Anyone can help ??

ciki 02-06-2017 06:52 AM

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

spintop 02-06-2017 10:44 AM

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 !

spintop 02-07-2017 07:24 AM

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

spintop 02-08-2017 07:49 PM

Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec
 
does anyone has the dump file ?
thks

RJARRRPCGP 02-08-2017 08:34 PM

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???

spintop 02-08-2017 08:42 PM

Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec
 
Quote:

Originally Posted by RJARRRPCGP (Post 724759)
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

RJARRRPCGP 02-09-2017 07:21 PM

Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec
 
Quote:

Originally Posted by spintop (Post 724760)
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...

spintop 02-10-2017 07:03 PM

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.

ciki 02-15-2017 06:40 PM

Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec
 
Quote:

Originally Posted by spintop (Post 725331)
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

spintop 02-15-2017 07:40 PM

Re: Lenovo Yoga 2 Pro - cannot turn on, keyboard blinking every 5 sec
 
2 Attachment(s)
Quote:

Originally Posted by ciki (Post 726583)
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

tlh 12-07-2017 03:27 AM

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

spintop 12-08-2017 06:42 PM

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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