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Laptop not Turning On

So basically My IdeaPad Gaming 3 (intel) is not turning on. One day It just suddenly stopped working. Went to ther service centre for the checkup. They opened the laptop and checked the components for damage but found nothing. Then they just cleaned it and put it back together. Surprisingly it turned on. At first I thought it was the dust. But later the same thing happened. After i shut down the pc and went to sleep, after somewhere like 9-10 hours i checked if it still turns on. Sadly it didn't. Went for the service again and the same happened. They opens the laptop disconnects parts. Finds no issues. Put back parts togather. And it starts working. Also to be clear it is NOT a battery issue that is confirmed.

Please Help I'm tired spending money on nothing.

Update (08/09/24)

Still Trying to figure out what the issue is...

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@maanrawat "They opens the laptop disconnects parts" we would need to knw which parts. You know it;s a power issue. You are not telling us how you know it's not the battery. Details matter so let us know how they checked it. Does it start when you disconnect the battery and just connect the AC adapter? Have you checked the power button itself? Checked the DC in jack?

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Parts like usual ram,SSD,hdd, battery,fans. haven't opened the motherboard yet so I'm guessing it must be a motherboard issue only. As for the battery they checked the battery and said no issues.

Also i checked the battery health on Lenovo vantage and it's says good condition so idk....

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An intermittent like this would tell me it is a bad/loose connection someplace. Could be corrosion on a connector or switch. Could be a bad solder. Unfortunately, it is a hunt and peck process. I would open it up to have access to the MB, then connect an adapter, hold the power button and start tapping around the MB (and/or a power board if there is one) lightly with the handle of a screwdriver. If there is no reaction, repeat tapping a little harder. Hopefully, it will come on and you can narrow it down to a specific location or part. Good luck.

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Maan Rawat zal eeuwig dankbaar zijn.
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