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Repair guides and support for Lenovo's line of consumer-oriented laptops, the IdeaPad series, first announced January 2008.

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4 year old Lenovo Flex4 1570 won't power on

My 4 year old Lenovo Flex4 1570 laptop won’t power on.

The battery led would blink amber lights. I tried unplugging the battery and holding the power button for 30 secs as suggested in some forums to get it out of sleep mode.

That didn’t work.

I figured then that the battery was done for and bought a new battery and replaced the old one. It’s charging now and I see blinking white lights indicating the new battery being charged. I tried powering on the laptop but I get the white power light to come on and then it goes off. Laptop does not power on.

Should the laptop power on when the new battery is charging? Or is it some other problem causing the laptop not to power on? CMOS battery?

I’ve seen some forums where the motherboard needs to be replaced. Not sure what to do at this point.

Thanks,

Sri

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I unplugged the CMOS battery and the laptop battery and let it sit for a few minutes unplugged. Plugged them back in and the laptop restarted and was able to boot to Windows. Date and Time are off but otherwise I was able to get the laptop to work.

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However, the battery won’t charge. This is a new battery bought from ifixit. So, is it possible that if the CMOS battery is dead it will prevent the main laptop battery from charging? I’ll try replacing the CMOS battery and see if that fixes this problem.

I haven’t seen a good logical explanation for how the CMOS battery can cause all these problems. My understanding is that the CMOS battery is used primarily to ensure the BIOS changes are preserved. Anyone have any thoughts on this?[br]

Sri

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Hi @srig

The CMOS (aka RTC - Real Time Clock) battery is there to maintain the BIOS settings as you said, BUT if a setting becomes corrupted for some reason this may prevent the laptop from starting normally, because the CMOS battery will also maintain a corrupted setting as well.

Removing the CMOS battery (and the main battery etc) and then dissipating any residual charge on the motherboard by holding the power button operated for a full 30 seconds i.e. it tries to turn on but obviously it can't because there's insufficient power, will reset the BIOS settings back to their factory default setting.

Is the battery showing up in Device Manager? (press Win key + x key, both together and click on the Device Manager link that is in the options box that opens). Maybe also check the results of a Win 10 battery report as well.

If it is not being detected you may need to use the schematics to find out why it isn’t charging. I couldn’t find a free one online but maybe searching for (insert motherboard’s board number) schematic may get better results. The model number is printed on the board itself.

If it turns out that the battery is faulty then Ifixit gives a warranty (see Consumables section) on their batteries

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Well, it turned out to be a faulty power adaptor (charger). I tested it with a multimeter and it showed 20v so I assumed it was good. However, I decided to get a new charger ( one of the many aftermarket chargers : https://www.amazon.com/gp/product/B08KW2...) just in case and the battery now is getting charged.

One clue that it may be the charger was that in Windows, even though the charger was plugged in the battery icon would not recognize that the charger was there. Here’s the link from Lenovo that points to that:

https://support.lenovo.com/us/en/trouble...

So, the steps I took were:

  1. Order new battery and replace the old one(probably didn’t need to do this but now I have a spare in case the 4 year old original dies)
  2. Unplug the main battery and the cmos battery and let it sit for a while so any residual charge dissipates (before I did this, I couldn’t start the laptop). This allowed me to restart the laptop with the 30% charge that the new battery came with.
  3. Order new charger so the battery can be recharged.
  4. One last thing was to back up the laptop drives to an external drive. Hadn’t done that in a while but now I’ll remember to do that often.

#

Thanks

Sri

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Sri wird auf ewig dankbar sein.
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