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Old 08-17-2014, 08:17 PM   #1
taleoftwocities
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Blank screen, modded bios, undervolted CPU


Hello everyone. I hope you can help.
Laptop is Lenovo y510p (with 755m sli and i7).
A week ago, i decided to flash modded bios (a lot more options), everything went well, then i flashed vbios for second gt 755m.
After that, i was looking for these new options, and i found Vcore Voltage Offset, i changed it to -65mV (i did it because my lenovo temps are extremly high, so undervolting should help a little). I saved setting, and restarted. After restart, i got blank screen. Keyboards led are on, so are power leds, fans are spinning too. And it gets hot after some time (i think VGA is getting hot, but im not sure).
First, i tried all popular tricks, like blind flash, hard reset, FN + ESC and so on.. i wanted to reset cmos via jumper or battery but battery was "sticked" for good and i couldnt find normal jumper (i found 2 pins named "jme1jcmos2" and i connected them with some metal for few sec), still blank screen.
Finally i gave up, and went to computer service.
Today they said that, they flashed new bios but screen is still blank. So what can be the problem? Maybe something with this vbios? This lenovo has integrated graphic and 2x 755m so is it possible that every 3 graphic card got burned or sth?
Which component can be bad?

Regards

Last edited by taleoftwocities; 08-17-2014 at 08:19 PM.
 
Old 08-17-2014, 08:22 PM   #2
Firerat
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Flash stock bios
 
Old 08-17-2014, 10:34 PM   #3
taleoftwocities
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They said they did flash stock bios. Maybe they did it wrong?
Can BIOS premanently change CPU or GPU settings (like voltages) so even after flashing new bios, these settings stay changed?

Last edited by taleoftwocities; 08-17-2014 at 11:11 PM.
 
Old 08-22-2014, 04:34 PM   #4
onebuck
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Member Response

Hi,

Welcome to LQ!

To reset the computer, press and hold the power button for four seconds;
Quote:
From http://www.lenovo.com/shop/americas/...ug_english.pdf
Your computer does not respond.

• To turn off your computer, press and hold the Power button for four
seconds or more. If the computer still does not respond, remove the
AC power adapter and the battery pack.
Hope this helps.
have fun & enjoy!
 
Old 08-22-2014, 04:36 PM   #5
taleoftwocities
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Hi.
Unfortunately, the problem is more complicated than that.
Even changing bios rom didn't help.
 
Old 08-22-2014, 05:22 PM   #6
onebuck
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Member Response

Hi,

Was this done by a certified shop? Under warranty?
 
Old 08-22-2014, 05:28 PM   #7
lleb
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Quote:
Originally Posted by taleoftwocities View Post
They said they did flash stock bios. Maybe they did it wrong?
Can BIOS premanently change CPU or GPU settings (like voltages) so even after flashing new bios, these settings stay changed?
if they did flash the BIOS, then it is most likely in its default settings. you might have to go back in and readjust the setting to better match your CPU/RAM
 
Old 08-22-2014, 05:38 PM   #8
taleoftwocities
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Well, it was done by regular computer service.
@lleb, what do you mean?
By the way, i spoke with another guy with same issue, he did the same thing (undervolt cpu in the same modded bios), and he is waiting for Lenovo service.
I could do the same, but i do not want to wait one month for repair...
 
Old 08-22-2014, 08:46 PM   #9
lleb
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simple some BIOS when they are flashed will not properly detect the CPU and thus you will have to manually "overclock" even though it is just putting the voltage(s) back were they belong
 
Old 08-22-2014, 08:52 PM   #10
taleoftwocities
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so how do i manualy overclock voltages on CPU?
 
  


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