The fan is on tight and the keyboard does not work

[Mitratq90]

I desperately need help, 

About my hp 14s fq1135au

My problem is, the fan instantly turns on and spins hard when I turn on my dekstop and doesn't stop unless the dekstop is turned off. My keyboard doesn't work either, not even one key is working, I'm very frustrated, a lot of work I have to finish in the near future, before the incident, there was a “fan 90b” notification

Already I have seen on the motherboard also there is no dust even very clean, my dekstop can still live and run normally, but the fan and keyboard are very problematic, I beg you, I really need  help

[Elohi_NR]

Hi @Mitratq90,

Welcome to the HP Support Community.

Thank you for posting your query, I will be glad to help you.

The 90B error on HP laptops indicates a cooling fan problem, and since you've already replaced the fan and verified it works on other HP laptops, there are a few possible explanations and steps you can take to resolve the issue on your specific HP Laptop 14.

Possible Causes and Solutions

Compatibility Issues:

• Different Fan Specifications: Even though the fan works on other HP models, it might not be fully compatible with your specific HP Laptop 14. Different models might have variations in voltage, current requirements, or control protocols.
• Fan Speed and RPM: The BIOS of your specific laptop model might require a specific RPM signal from the fan, and if the replacement fan doesn't match the expected signal, the BIOS might still detect an error.

BIOS/Software Issues:

• BIOS Settings: Check if there's a BIOS update available for your laptop. Sometimes, updating the BIOS can resolve compatibility issues.
• Reset BIOS: Try resetting the BIOS to default settings to see if it resolves the issue.

Hardware Connection:

• Pin Configuration: Ensure that the pin configuration and wiring of the fan are correct. Even slight differences can cause the fan not to be detected properly.
• Secure Connection: Make sure the fan connector is securely and correctly connected to the motherboard.

Steps to Troubleshoot

BIOS Update:

• Visit the HP support website, search for your laptop model, and check if there's a BIOS update available. Follow the instructions to update the BIOS.

Reset BIOS to Default:

• Enter the BIOS setup during the boot process (usually by pressing F10, Esc, or Delete key during startup).
• Find the option to reset BIOS settings to default and save the changes.

Check Fan Specifications:

• Compare the specifications of the original fan with the replacement fan. Look for differences in voltage, current, and RPM ratings.

Use the Exact Replacement Part:

• It’s best to use an exact replacement part for the cooling fan. You can try searching for the fan using the laptop’s model number on HP’s parts store. Websites like eBay, Amazon, or specialized laptop parts retailers might have the exact fan you need.

You may also refer to this document for more information. 

Hope this helps! Keep me posted for further assistance

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