Lenovo Z50-70 crashes when charger connected, erratic working on battery

[kronikus]

Hi,
my Lenovo Z50-70 NM-273 with Intel i5 and Nvidia N15 discrete graphics work only on battery. And even on battery it is not predictable how long it will last before crashing. Sometimes work for whole hour, sometimes 5 minutes, regardless of what I'm doing.
Same is happening no matter what windows is installed. Curretntly it is on Win 7 64bit, all drivers are installed without any problem - chipset, both graphics etc. Laptop does not overheating, it's clean and with new thermal paste. Furmark works just fine and temperature does not exceed 65 degrees.
Everything seems OK and, for no reason, laptop crash and stays off. Without restarting. Every time. No BSOD, no any error message.
Other problem is that when power adapter is plugged, it crashes instanly.
I can power it again with power adapter, but it crashes in shorter intelval every time. For example, it works on power for 5 minutes an crashes, than next time works for 3 minutes etc. At last, it can not even start.
When laptop is off, baterry charging works fine.
Does anyone have experince with that specific problem?
I have schematics but no boardview.

[mcplslg123]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Gpu issue??

[ktmmotocross]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

check voltages on both side of PQ302, PQ303, PR306 when connected and disconnected charger

[kronikus]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

It passed all graphic tests, works steady 30+ minutes on Furmark. Official drivers for Intel and Nvidia gpu are installed without any problems. Passed dxdiag. Passed Lenovo diagnostic on all components. Maybe the most important fact is that laptop crashes instantly when charger is plugged in? Every time. Even without hard disk. Can that be related to graphics?

[kronikus]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Ok, I'll do measurements on PQ 302/303 and PR306.

[kronikus]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

On battery, turned off:
Drain/Source/Gate
PQ302 15.2/14.8/14.5
PQ303 15.2/.15.2/0
PR306 0(VIN side)/0(diode side)
On battery, turned on:
Drain/Source/Gate
PQ302 15.3/14.9/14.6
PQ303 15.2/15.2/0
PR306 0(VIN side)/0(diode side)
On charger with battery, turned off:
Drain/Source/Gate
PQ302 20/20/5
PQ303 16/20/20
PR306 20(VIN side)/0 (diode side)
On charger and battery, when turned on and than removed battery, PQ303 Drain stay 16.8V untill turned off. Than drops to 0.8V and stay 0.8V unill battery reconected, when jumps to 16.8.
Again, when battery was removed during work, Drain stay at 16.8V untill turning off by power button or crashing.

[ktmmotocross]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

pr306 was mistake. i mean pr316

[kronikus]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

On both side of PR316 voltages are same as on the Drain of PQ303.
Voltage drop across some coils:
PL303 8.2mV; PL304 9.9mV; PL307 1.7mV; PL701 5.9mV; PL9 6.9mV.

[kronikus]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Some tests. I removed RTC battery so don't pay attention to the time.

[RJARRRPCGP]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Hi,
my Lenovo Z50-70 NM-273 with Intel i5 and Nvidia N15 discrete graphics work only on battery. And even on battery it is not predictable how long it will last before crashing. Sometimes work for whole hour, sometimes 5 minutes, regardless of what I'm doing.
Same is happening no matter what windows is installed. Curretntly it is on Win 7 64bit, all drivers are installed without any problem - chipset, both graphics etc. Laptop does not overheating, it's clean and with new thermal paste. Furmark works just fine and temperature does not exceed 65 degrees.
Everything seems OK and, for no reason, laptop crash and stays off. Without restarting. Every time. No BSOD, no any error message.
Other problem is that when power adapter is plugged, it crashes instanly.
I can power it again with power adapter, but it crashes in shorter intelval every time. For example, it works on power for 5 minutes an crashes, than next time works for 3 minutes etc. At last, it can not even start.
When laptop is off, baterry charging works fine.
Does anyone have experince with that specific problem?
I have schematics but no boardview.

Sounds like no crash, just straight to shutdown. (power loss)

[ktmmotocross]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

did u try another charger?

[kronikus]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Yes, It is power loss. Laptop suddenly turns off and stay off.
I tried another charger and other battery, too. Nothing changed.

[Gurmit]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Hi did you find the problem? I am having similar issues with my Z50-70 laptop.

[acshud]

Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

i have a same problem.advice