Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Laptops, Tablets, and Mobile Devices
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 12-20-2018, 10:12 AM   #1
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default 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.
Attached Files
File Type: pdf Lenovo Z50-70=1=ACLUA_MB_20131231_Schematic.pdf (1.46 MB, 27 views)

Last edited by kronikus; 12-20-2018 at 10:19 AM..
kronikus is offline   Reply With Quote
Old 12-21-2018, 02:10 AM   #2
mcplslg123
Badcaps Veteran
 
Join Date: Jun 2015
City & State: siliguri
My Country: india
Line Voltage: 220vac,60hz
I'm a: Professional Tech
Posts: 4,413
Default Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Gpu issue??
mcplslg123 is offline   Reply With Quote
Old 12-21-2018, 09:48 AM   #3
ktmmotocross
Boardkiller
 
ktmmotocross's Avatar
 
Join Date: Feb 2014
City & State: slovakia
My Country: slovakia
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 2,654
Default 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
ktmmotocross is offline   Reply With Quote
Old 12-21-2018, 09:56 AM   #4
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default 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 is offline   Reply With Quote
Old 12-21-2018, 09:57 AM   #5
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Ok, I'll do measurements on PQ 302/303 and PR306.
kronikus is offline   Reply With Quote
Old 12-21-2018, 10:52 AM   #6
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default 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.

Last edited by kronikus; 12-21-2018 at 10:55 AM..
kronikus is offline   Reply With Quote
Old 12-21-2018, 02:49 PM   #7
ktmmotocross
Boardkiller
 
ktmmotocross's Avatar
 
Join Date: Feb 2014
City & State: slovakia
My Country: slovakia
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 2,654
Default Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

pr306 was mistake. i mean pr316
ktmmotocross is offline   Reply With Quote
Old 12-21-2018, 04:20 PM   #8
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default 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 is offline   Reply With Quote
Old 12-21-2018, 05:34 PM   #9
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default 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.
Attached Images
File Type: jpg 01 Nvidia GPU.jpg (296.7 KB, 13 views)
File Type: jpg 02 Intel GPU.jpg (305.2 KB, 8 views)
File Type: jpg 03 GPU.jpg (45.6 KB, 6 views)
File Type: jpg 04 MOBO.jpg (54.6 KB, 4 views)
File Type: jpg 05 Furmark.jpg (88.1 KB, 10 views)
File Type: jpg 06 CPU.jpg (32.7 KB, 4 views)
File Type: jpg 07 HDD.jpg (52.5 KB, 5 views)
kronikus is offline   Reply With Quote
Old 12-21-2018, 05:38 PM   #10
RJARRRPCGP
Badcaps Veteran
 
Join Date: Jul 2004
City & State: North Springfield, Vermont
My Country: USA
Line Voltage: 118-127V 59-63.5 Hz-> actualizo: pérdido de voltaje
I'm a: Knowledge Seeker
Posts: 6,038
Default Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

Quote:
Originally Posted by kronikus View Post
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)
__________________
ASRock B550 PG Velocita

Ryzen 5 "Vermeer" 5600X

32 GB G.Skill Trident Z Neo F4-3600C18D-32GTZN

Sapphire Nitro+ Radeon RX 6600 XT

eVGA Supernova G3 750W

Western Digital Black SN850 1TB NVMe SSD




"¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr"!" -mí mismo

"There's nothing more unattractive than a chick smoking a cigarette" -Topcat

"Today's lesson in pissivity comes in the form of a ziplock baggie full of GPU extension brackets & hardware that for the last ~3 years have been on my bench, always in my way, getting moved around constantly....and yesterday I found myself in need of them....and the bastards are now nowhere to be found! Motherfracker!!" -Topcat

"did I see a chair fly? I think I did! Time for popcorn!" -ratdude747

Last edited by RJARRRPCGP; 12-21-2018 at 05:40 PM..
RJARRRPCGP is offline   Reply With Quote
Old 12-21-2018, 11:38 PM   #11
ktmmotocross
Boardkiller
 
ktmmotocross's Avatar
 
Join Date: Feb 2014
City & State: slovakia
My Country: slovakia
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 2,654
Default Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

did u try another charger?
ktmmotocross is offline   Reply With Quote
Old 12-22-2018, 02:20 AM   #12
kronikus
Member
 
Join Date: Feb 2015
City & State: Zagreb
My Country: Croatia
I'm a: Knowledge Seeker
Posts: 66
Default 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.
kronikus is offline   Reply With Quote
Old 05-29-2020, 09:22 PM   #13
Gurmit
New Member
 
Join Date: May 2020
City & State: Singapore
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 1
Default 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.
Gurmit is offline   Reply With Quote
Old 07-12-2021, 11:17 PM   #14
acshud
Member
 
Join Date: Sep 2017
City & State: iasi
My Country: romania
I'm a: Knowledge Seeker
Posts: 61
Default Re: Lenovo Z50-70 crashes when charger connected, erratic working on battery

i have a same problem.advice
acshud is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums © 2003 - 2022
Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 08:15 AM.
Did you find this forum helpful?