Since this is a hardware issue with the Display Backlight, please contact HP Support for Service Options
Click on this link - https://support.hp.com/us-en/contact-hp?openCLC=true and select your Country to get the Contact details for HP Support
If the information I've provided was helpful, give us some reinforcement by clicking the "Solution Accepted" on this Post and it will also help other community members with similar issue.
KrazyToadI Am An HP Employee
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