Question lenovo e431 requires a power drain to boot...what needs to be fixed?

[berbes]

hello. i have a lenovo e431 that will not start unless i disconnect the battery and perform a power drain. on other units, that's all that needs to be done and they work, but on this one, once i restart, it goes right back to not booting, black screen and no beeps. i've also let the battery run out naturally and once i hook up the a/c, it'll boot once, but the minute i reboot, it goes right back to a black screen & no beeps. is it the battery? the MB battery? what needs to be replaced?

thanks!
berbes

 

[corkyg]

What happens if you remove the battery and run solely on AC adapter?

 

[berbes]

once i drain the power, it boots just fine. i just spoke with the client, and they said they've already changed the battery and it didn't help. what could be the cause of needing power drains to boot?

 

[corkyg]

That is not the question I asked. Forget power drains. Remove the battery and connect AC power. What happens with no battery in the unit when the start button is pressed?

 

[corkyg]

The problem stated relates to residual static electricity, also known as flea power. More often than not, a persistent recurrence of it is sometimes caused by a faulty capacitor on the motherboard.

https://forums.lenovo.com/t5/ThinkP...aving-to-drain-it-to-get-my-P52s/td-p/4355013

 

[berbes]

now it won't boot at all...feeling MB too . i also found this:

Please do try these troubleshooting steps that I suggested to others who had the same concern with their laptop.
- Start by doing a hard reboot, remove the battery and unplug the AC adapter then press and hold the power button for 20 seconds then try booting it up again.
- If this will not work, do test the AC adapter if it's working properly. Remove the battery and power the laptop with just the AC adapter connected and see if it will boot up or not. do also try a different AC adapter that has the same voltage and see if it will work or not.
- Proceed with reseating the RAM's if trying a different AC adapter will not work, remove them all for couple of seconds then put them back in making sure everything is seated properly.
- If it will still not work, connect an external monitor and see if you'll get any display from it. If there's a display on the external monitor that could mean that the problem is the built in display.
- But if there's still no display on the external monitor that means the problem lies in the motherboard.



thanks for the knowledge, corky!!
berbes

 

[corkyg]

It is beginning to sound like the motherboard. Good work!

 

[berbes]

whew. this workflow is tough work for an old tech . thanks again.

 

[heymrdj]

Bios updated? We had a huge batch of E530 windows 8.1 machines at my last place upgraded to 10. If they fell asleep, they would have to be power drained. Lenovo put out a BIOS update to resolve it.

 

[zlognom]

When you switch on the laptop, just check that before it was switchd-off or standby. This may be the cause. To arret this problem, you should ensure that when you leave PC shut it down properly. The battery seems to be ok, may be the RAM is not functioning well. CHeck the RAM for tightness.