Lenovo Y50-70 Touch Soft bricked!

Hi, guys!
I had a whitelisted bios + advanced menu and unlocked vbios for lenovo y50-70 touch. Today I decided to undervolt the cpu in the advanced / overclocking tab in the bios. I tested -90mv stable in windows, but when i applied -70mv in bios and hit F10 and saved, the laptop shut down and never wants to get to the POST screen. I tried disconnecting the bios battery, main battery swapping ram, holding power on when everything above disconnected - still nothing after multiple attempts. (I never tried to disconnect the SSD, but I dont think it would make any difference). After all these attempts, I also tried to start the laptop and leave it for 1 hr - nothing. Looks like my settings have been "programmed" into the chip?!. When I start the computer the keyboard is on (caps lock / num lock dont respond with the little light indicator). Cpu & GPU under the heatpipes are hot after 1 hour of "trying to boot" operation. Any ideas how to fix that problem?
Thank you very much!

 

Disconnecting BIOS battery should clear BIOS and get you going, but maybe you didn't give it enough time (there could be capacitors holding a charge)? I would just leave it overnight and then try restarting, I know you know you it, but also make sure main battery is out.

 

Thanks, Will try tonight. I always did just like 1-2 minutes and shorting the positive and negative on the bios battery connector

 

Remove laptop battery, CMOS/BIOS battery, and power cord. Hold power button for 30 seconds. It shouldn't need all night. There must have been some other glitch, because it's a soft change with voltages, nothing is hard coded, just registers changed in CMOS that always revert back to default with power removed.

Next time though, try using Intel XTU (Extreme Tuning Utility) where you can adjust that stuff in Windows, and test immediately. If it locks up, usually you can shut down or reboot and it will automatically reset the settings.

 

I tried everything above and still no POST screen. I also removed the 2 ram blocks, but nothing more than a black screen and keyboard on. Main battery has been disconnected for a week already. I don't understand how a single setting in bios could make such a big mess. I guess bad bios coding from the modifier of my bios... Any other ideas are welcome!
Thanks...

 

If you had voltmeter, you could check voltage coming to CPU (very carefully, you could easily short something otherwise) to verify voltage was reset to normal and therefore something else causes the problem. I undervolted my i7 4710 by more than 150mV in tests and it wasn't stable, but it would boot up.
Another crazy idea, take it outside, if it's cold and try to boot up then, in colder temp. CPU will be more stable and maybe not crash before post, assuming the voltage got stuck on some too low voltage, just be careful of water condensation.

 

Ok, I'm going to try the "crazy idea" I live in Colorado @ 8000ft & dry air, so that might as well be a good idea. Tonight imma "freeze" the MB, as long as it doesn't snow and give reports here.
Cheers.