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2 Questions View all | 14 Parts Shop

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Lenovo 82R3 won’t boot: Power LED on but fan & keyboard dead

My laptop is a Lenovo 82R3 (AMD). Initially it often failed to power on during cold boot: the power LED turns on, but the fan, keyboard, and display stay off. Usually it only boots after a forced shutdown.

Now it is even completely dead — even with forced shutdown it cannot power on (power LED is on, but fan and keyboard are dead).

I already updated to the latest BIOS and also had the firmware hardware-flashed. However, the problem still remains.

With these symptoms, what is the most likely cause of my laptop issue?

Any help is appreciated, thank you.

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Hi @irfanardiansyah

Try a power refresh and check if that resolves the problem.

Here’s the procedure:

Disconnect the charger from the laptop, (if connected).

Open the laptop and disconnect the main battery from the motherboard. You don't have to remove the battery, just unplug the battery cable from the motherboard

Disconnect and remove the RTC coin cell battery from the motherboard.

Here’s the hardware maintenance manual for the laptop that will help. It shows how to disconnect the main battery (see p.29 of the manual - 35 of 66 pdf) and also how to disconnect the RTC coin cell battery (see p.36 of the manual - 42 of 66 pdf)

When the RTC battery is out check its voltage. if it is <2.5V DC or if the battery is >4-5 years old, replace it. Search online for 5B11F14640 or 5B11F14639 to find suppliers that suit you best

Press and hold the laptop’s Power On button for a full 30 seconds and then release it.

Reconnect the RTC coin cell battery on the motherboard, reconnect the main battery to the motherboard, re-assemble the laptop, connect the charger to the laptop and try to start it.

If it starts, there may be a message about the date and time being incorrect. This is normal as the above procedure has reset the BIOS back to its factory defaults. Once the date and time have been adjusted, the message won't appear the next time the laptop is started. Any user defined BIOS settings that have been altered by you to suit your particular requirements will need to be changed back also.

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5 Comments:

Hi @jayeff

I've already tried everything as suggested, but the result is still the same.

Current condition:

On the first power on: the power LED turns on, but the keyboard and fan stay off.

Normal force shutdown doesn’t change anything.

But if I force shutdown with the charger connected, then power it on again, the laptop boots normally.

by

@irfanardiansyah

After the laptop has booted OK into Windows, create a battery report to check the condition of the battery in the laptop.

Compare the Design Capacity value versus the Full Charge capacity value.

For a good battery, normally the two values are close in value.

You can work out the condition as a percentage by using the formula Full Charge capacity value x 100 ÷ Design Capacity value.

If the battery is <30% it may be failing and this is why there may be problems turning the laptop on.

Just trying to eliminate some things because otherwise there may be a motherboard problem

Also please "Unaccept" my initial Answer above so as to not confuse anyone else who reads this as it didn't solve the problem

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@jayeff

Sorry, first time using this site and i mistakenly listes the wrong laptop type. My laptop is a lenovo ideapad 3 14ABA7

The result of what you suggested shows that my battery condition is 86%.

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@irfanardiansyah

I don't know.

It's almost like the forced shutdown with the charger connected after failing to start the 1st time has reset the BIOS somehow so that this time it starts POST (power on self test)

Whereas on the 1st start attempt it doesn't even start to POST or if it does it fails.Usually though if POST fails there's a beep or LED error code to indicate what's wrong.

The absence of this indicates to me that it hasn't even started to POST or if it has it is too early in POST for any error codes

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@jayeff

I have already taken it to a repair shop (not an official Lenovo service center). The technician said the motherboard, battery, and MOSFET are all fine, and they have already reflashed the BIOS, but the result is the same. In the end, the technician gave up and said they don’t know where the problem is, which makes me confused.

Could the issue possibly be with the EC (Embedded Controller)?

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Irfan Ardiansyah will be eternally grateful.
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