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Lenovo N500 won't boot, no fans, only blue LED light

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MrOtto123
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Lenovo N500 won't boot, no fans, only blue LED light

#1 Post by MrOtto123 » Fri Mar 18, 2022 4:02 am

My Lenovo N500 laptop has been sitting without a battery for a few years.

I tried it now, charged the battery, but there is no post, no boot, no fans, only blue led light on for a few seconds. I have disconnected all devices, and tried another cpu and ram, but no luck, same blue led light for a few seconds. I have tried to remove power and battery and holding the power on for a minute, but doesn't work.

I remember I had the same problem the last years I used it, and unplugging battery and power and holding power button fixed this.

Could a dead CMOS battery be a problem? Should I desolder it and replace it? This is the only way to reset BIOS if the battery is not dead?

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Re: Lenovo N500 won't boot, no fans, only blue LED light

#2 Post by RealBlackStuff » Fri Mar 18, 2022 4:45 am

Try booting without main battery, only charger attached.
Press Esc if/when date/time is asked for.
If that doesn't work and CMOS is dead, you cannot set date/time and without that, the laptop cannot start up.
So yes, replace the CMOS.
Lovely day for a Guinness! (The Real Black Stuff)
IBM: T23 (XP/SP3) - Lenovo: X240, X250, T440p, M900 Tiny (all with W7/SP1)

MrOtto123
Posts: 5
Joined: Fri Mar 18, 2022 3:59 am
Location: Nesoddtangen, Norway

Re: Lenovo N500 won't boot, no fans, only blue LED light

#3 Post by MrOtto123 » Sat Mar 19, 2022 9:59 am

Thanks. I have tried without the battery and only the charger. Same symptoms, no fans and only blue LED light for 5 seconds.

I will replace CMOS battery. I am almost certain it is discharged completely.

MrOtto123
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Joined: Fri Mar 18, 2022 3:59 am
Location: Nesoddtangen, Norway

Re: Lenovo N500 won't boot, no fans, only blue LED light

#4 Post by MrOtto123 » Sun May 29, 2022 9:01 am

I measured the CMOS battery. It read 2.48v when not battery or charger was connected. So it seems to be in order. Should I desolder it to reset the CMOS, or do I have to replace the CMOS chip?

MrOtto123
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Joined: Fri Mar 18, 2022 3:59 am
Location: Nesoddtangen, Norway

Re: Lenovo N500 won't boot, no fans, only blue LED light

#5 Post by MrOtto123 » Sun May 29, 2022 10:15 am

Desoldered the battery, it says 3v spec. Sanyo ML12-something (ML1220?), can't make it out. 2.48v, possibly to low voltage to maintain CMOS?

https://i.imgur.com/Op74osi.jpg
https://i.imgur.com/g3LQ5n1.jpg

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Re: Lenovo N500 won't boot, no fans, only blue LED light

#6 Post by RealBlackStuff » Sun May 29, 2022 11:20 am

You need ~3V or better.
Lovely day for a Guinness! (The Real Black Stuff)
IBM: T23 (XP/SP3) - Lenovo: X240, X250, T440p, M900 Tiny (all with W7/SP1)

MrOtto123
Posts: 5
Joined: Fri Mar 18, 2022 3:59 am
Location: Nesoddtangen, Norway

Re: Lenovo N500 won't boot, no fans, only blue LED light

#7 Post by MrOtto123 » Mon May 30, 2022 6:26 am

Thanks. I have ordered a new solder in battery.

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