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Fourth generation 2-In-1 convertible laptop released on 2015. Succeeding the Yoga 3 Pro, the Lenovo Yoga 900 (also known as the Yoga 4 Pro) sports a durable 360° watchband hinge, an ultra thin chassis, and extended battery life.

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After replacing the fan, laptop only works when Battery is unplugged

One of the fans didn’t work, so I bought a new one and tried to replace it myself. After disassembly and reassembly (which was hard enough due to a broken screw), my laptop only works when the battery is unplugged. (Via AC)

When the battery is plugged, I get 3 red blinks next to the power button and nothing happens afterwards.

Both fans seem to work, WIFI, speaker, keyboard worked all.

What happened to the battery? It was in a good state prior to the disassembly.

I appreciate any help. Thanks!

Btw: it’s the lenovo yoga 900-13ISK 80MK (not 13ISK2)

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Hi @buenavista62 ,

Did you disconnect the battery from the systemboard before doing any further work in the laptop?

crwdns2893770:0crwdnd2893770:0crwdne2893770:0

Hi @jayeff,

I may have took the wifi-card out before disconnecting the battery, I am not sure.

Could the battery be permanently damaged?

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did you check with another charger if it is working

crwdns2893770:0crwdnd2893770:0crwdne2893770:0

Hi @buenavista62 ,

It's not the battery I was thinking of.

Even though a laptop is switched off there is always power at different points on the motherboard.

The Power button is not a power isolating button. When it is pressed, it just provides an earth to components on the motherboard that have power supplied to them all the time.

When working or repairing in laptops (and any electronic equipment) the rule is disconnect the power as soon as you can access it before doing anything else, unless you need power for testing purposes. "Power off first - on last"

Essentially the laptop is in a very low power state when it is switched off but there is still power there on the motherboard.

What I was hoping was that when you said the you had trouble removing a screw that you didn't accidentally slip with any tools and touch components on the motherboard that "may" have had power connected to them and caused electrical problems, because the battery may still have been connected. It has been known to happen

Slipping with tools and causing mechanical damage to components is one thing and is usually obvious but electrical damage can be invisible.

I'm not trying to frighten you I was just asking so that it may be a consideration when trying to think of how to solve the problem, as the LED light error code that you described is not in the hardware manual for the laptop.

Did you mean amber light instead of red?

If so this indicates that the battery is charging as it is low, but since you said that it was OK before and it doesn't start with the battery connected then either the system is not "seeing" the battery for some reason or cannot charge it.

Did you try leaving it connected to the charger for a while just to see if the lights changed?

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@jayeff yes, amber light. Sry for that.

If battery is plugged: as soon as I connect the laptop with the AC cable, the keyboard lights go on and the laptop tries to start up. After a while a blue screen appears with an error message: driver power state failure.

Then it reboots and I get a "novo button Menu" with 4 options (normal startup, BIOS setup, Boot menu, System recovery)

But somehow my keyboard doesn't work in this situation

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Hi @buenavista62,

Just recapping.

The keyboard works when on AC only but not when on AC with the battery in, is this correct?

Also with the battery plugged in, the laptop starts straight away as soon as you plug in the AC adapter but it needs the Power button to be operated to start when the AC adapter is not plugged in, is this correct?

Try resetting the BIOS to default values in case the BIOS is corrupted somehow and check the result.

Not sure given what you said, but it may depend on whether you have the battery connected or not, at the time as how to do this.

If the battery is not already connected, turn off the laptop if it is on and when it has completely shutdown disconnect the AC adapter from the laptop. Press and hold the Power button for 30 seconds to dissipate any residual power from the motherboard and then release the button.

Reconnect the battery and then reconnect the AC adapter to the laptop. Hopefully the laptop won't turn on automatically and will only show that it is charging. If this is the situation, then be patient and allow the battery to fully charge before attempting to turn on the laptop in the normal way. If it turns on as soon as you connect the adapter see below.

If the battery is already connected or if it turns on straight away again, (see above) turn off the laptop and when it has completely shutdown remove the AC adapter and disconnect the battery from the motherboard. Reconnect the AC adapter only and then start the laptop by pressing the Novo key and selecting the BIOS option. When in BIOS usually there is a key that is pressed to load the BIOS to default values. Press that, save the changes and exit BIOS and shutdown the laptop. When it has completely shutdown disconnect the AC adapter and reinsert the battery. Try to start the laptop on the battery only and check what happens.

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Hi @jayeff,

To the first two paragraphs: yes, the keyboard only works when the battery is unplugged.

The laptop also starts automatically when I plug in the AC adapter while the battery unplugged. However, I can shut it down afterwards and it won't turn on again by itself.

When both AC adapter and battery are plugged in, the laptop gets never in a shut down state. The white light on the power button will always light up and also the screen is clearly on. But with both plugged in, I get never past the blue screen or lenovo loading screen.

I tried your steps and ended up with the same situation. Battery is plugged, AC adapter unplugged -> 3 times amber light. Nothing else happens.

I hope I set the BIOS correctly to default. Because there were two options: set BIOS settings to default and something like optimized default setting.

Some helpful images:

Battery unplugged, AC adapter plugged: https://imgur.com/a/Ews8pYb

It says that 255% is remaining, weird.

Second pic: I clicked on 'load default settings' and then 'save and exit'. Was this correct?

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Hi @buenavista62,

Going back a bit you said

"If battery is plugged: as soon as I connect the laptop with the AC cable, the keyboard lights go on and the laptop tries to start up. After a while a blue screen appears with an error message: driver power state failure.

Then it reboots and I get a "novo button Menu" with 4 options (normal startup, BIOS setup, Boot menu, System recovery) But somehow my keyboard doesn't work in this situation "

Try the following.

Disconnect the battery and connect the AC charger and start the laptop.

You said that this way it works so let it boot all the way to the Windows desktop and then wait a few minutes for the HDD activity to settle down. Then shutdown the laptop in the normal wayi.e. Windows Start button > Power >Shutdown.

When the laptop has completely shutdown, disconnect the AC adapter and reconnect the battery.

This next part may be tricky as you may have to be quick.

Reconnect the AC adapter and when the laptop starts to boot automatically (as you said before that it does), force shutdown the laptop between the time it starts and the time it starts to boot into Windows, by holding the Power button until it shuts down.

If you get the Lenovo splash logo when the laptop first starts press the Power button when it is showing before the Windows logo starts showing.

If there is no time between the time it starts and the Windows logo showing restart the laptop on AC only (no battery) and when in Windows disable fast startup and try the above again.

This time when it starts you should get the Lenovo splash screen on startup before Windows starts to boot so you have a little time to press and hold the Power button

When the laptop has shutdown, check what happens.

Does it want to start again automatically?

Are the 3 blinks only amber light there still or is it different?

Can you start the laptop by pressing the Power button in the normal way and if so what happens?

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@jayeff As soon as the lenovo logo appears, it will start up automatically after a shut down via power button.

However, if I shut it down before the lenovo logo appears, then it stays shut down. What remains is the amber light, blinking every second.

This is the light:

https://imgur.com/a/YB69tY7

I could also upload videos, if that is helpful

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Hi @buenavista62 ,

There is something interfering with the BIOS that runs the motherboard but all attempts to reset it haven't worked so it is looking like a hardware problem

It may be a problem on the motherboard so a schematic would be required.

Try searching online using the 'board number" of the motherboard to see if there is one available online.

If not you may have to take it to an authorized lenovo repair centre as they should have access to the schematics.

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