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PostPosted: Tue Mar 06, 2018 10:20 am 
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Pilgrim
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Hi guys, thank you for maintaining this forum!

My Lenovo Thinkcentre E93z ( s/n S1002WQE model 10B8003TIX current bios version FFKT28AUS) upgraded to W10 pro 64bit shuts down properly, the power led turns off but after 6 seconds it reboots.

None of the solutions found googling helped me. I booted a live linux distro, I shut it down and it restarted after 6 seconds as usual.

To solve the problem I tried to update BIOS to the last release FFKT46A downloaded from lenovo website but without any success. I tried to update it from the windows utlity, from a cdrom and from a bootable usb but the version of the bios doesn't change, no errors, watch the video: https://youtu.be/n47ELqpmgJ8

If I update the same release already installed it seems to work https://imgur.com/a/t3akz

I brought it to the lenovo official technical service, they tried everything I had already tried and they stated that the motherboard is broken and must be changed.

I ask you, is this true?

thank you very much indeed


Last edited by luca789 on Wed Mar 07, 2018 12:37 am, edited 1 time in total.

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PostPosted: Tue Mar 06, 2018 10:29 am 
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Mobo-fu Master
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Could be a simple fix, but also a very complicated one. Hope the easy way out is found.
Check the BIOS pages as to state of use after a power outage.. should be there, and if so, set to "stay off".
May also be an issue with a previous 'sleep' mode, and not brought out properly. Requires an "Fn" key and maybe the power button, or another key. Check the user manual as to restoring to normal on/off switching.

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PostPosted: Wed Mar 07, 2018 2:00 am 
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Karls, thanks for your help.
i set to "stay off" in case of power outage but I don't understand what should happen with the FN + pwr button and I tried to google it and to look for the pdf manual but without any success. Could you explain better?


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PostPosted: Wed Mar 07, 2018 3:15 am 
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I also wonder why I can't update the Bios


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PostPosted: Wed Mar 07, 2018 4:33 am 
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shall I try to uninstall the cr2032 battery and install it back again?


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PostPosted: Wed Mar 07, 2018 8:06 am 
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Not much success in finding a user manual for that unit. But did find one main site..
https://support.lenovo.com/us/en/search ... masthead_S
And maybe some support?
https://download.lenovo.com/pccbbs/thin ... hmm_en.pdf
The regular desktops and 'small' computer models have a PSU that is usually on mains power all the time, unless turned off. Laptops seldom have that need for power control.
That PSU provides a +5 volt stand-by source for certain features such as USB ports and BIOS needs. If the unit is turned off and power is interrupted, it may turn on by itself if that BIOS control line is not set to "stay off". For server installs and special needs, the unit may be required to self-restart if unattended.
The "Fn" key controls which features those "F" keys provide. Normal use is just the "F1" through "F12" feature, but using the "Fn" button with each key provides the secondary feature, noted by a small icon.
If a unit is put to sleep for quick access later, it should return to full status. But with some units, if awakened in the wrong mode, can give problems. A combination of the "Fn" key with the power button should clear any errant commands and restore normal operations. May not apply to all brands and models, that is a proprietary design.

A BIOS update should be done only if revised features include newer CPU or memory types, or for hardware driver updates.
Doing a spontaneous BIOS update may cause problems. For each unit, the specific BIOS program is mandated. Some units require a BIOS update program on a floppy disk, which is more or less antiquated. Most will do a BIOS update from a flash memory (USB) stick which is ISO formatted for auto-boot. Some also do a BIOS update from within the OS control. For any needs of creating a bootable media, check http://www.bootdisk.com/
In the lower left corner of the first video image, there should be a string of characters.. that is a positive ID of the system including its inception date for the BIOS. You may need to set the BIOS feature to 'show all' or 'show BIOS' or how else worded, if that string is not presented.
As to changing the BIOS battery, typical life is about 3 years, depending on use. The battery is only a redundant backup for when no mains power enters the PSU for that +5 volt stand-by feature. You can easily check the battery status by using a digital volt meter from the top of the battery (marked +) to any ground point (exposed metal shield, like the keyboard shield) or the contact on the black power leads for a +3 volt reading when no mains power enters the PSU after about 5 minutes. Lower than 3 volts, time for a new battery.
If the BIOS battery is weak or dead, the BIOS memory settings can be reverted to default in the CMOS memory.
Changing the battery should be easy, but after doing so check each BIOS page to ensure it complies to how the system is set up.. all features and especially date/time. Memory timings are preferred to be set automatically with the "SPD" detect line (serial presence detect).
Laptops are in a different class, won't go into that morass here.

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PostPosted: Thu Mar 08, 2018 12:48 am 
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Dear Karls, thank you for your answer, I am working on psu, check these photos please https://imgur.com/a/sYijb


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PostPosted: Thu Mar 08, 2018 9:26 am 
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Using a bootable usb drive and the "afudos.exe file.rom /p /b /n" command I managed to update the bios to the version FFKT30A but the problem remains, after shutting completely down the pc it restarts... could be the Embedded controller (version FFCT04A)?
could be the PSU? https://imgur.com/a/oTW08

Shall I update to the last avaiable bios version, the FFKT46A?
Thank you Karls


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PostPosted: Fri Mar 09, 2018 6:31 am 
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Have to repeat..
'A BIOS update should be done only if revised features include newer CPU or memory types, or for hardware driver updates.'
Otherwise, new problems may appear.
The restart problem may be due to a BIOS problem, or possibly the OS itself is not giving the desired command to fully shut down. Try the default sequence of using the [Alt] key an the [F4] key to bring up the switching menu. Choosing the 'shut down' line should do the proper function. In the Administrative Tools/Computer Management there is a log of all events done by the OS.. the "Event Viewer". Any abnormal function will have a flag of what happened, Yellow, not serious. Red, serious.
Did some more browsing, found these links.. may be of some help.
https://support.lenovo.com/us/en/solutions/ht117681
https://forums.lenovo.com/t5/Lenovo-C-E ... -p/3584585
https://community.spiceworks.com/topic/ ... r-shutdown
https://askubuntu.com/questions/411397/ ... turned-off

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PostPosted: Fri Mar 09, 2018 8:02 am 
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Akt+F4 works properly but doesn't solve the restart issue
I followed all the links you kindly found and I couldn't find any solution, I stil have to check if the pwr button is not functioning properly.
I think it's not a windows issue but an hardware issue because I reset W10 pro to factory defaults and the problem is still there.

Thank you Karl.


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