Dell 3521 LA-9104p Fan Controller APE8873M

Laptops are very important part of anyone’s  life. If it out of order our speedy life feels like stuck.So to keep laptop healthy by service it every three months. usually, laptops are out of order by dust and choking fan, Normally its ok by removing dust and grease fan.but if a fault in PCB circuit then we have to understand how the circuit works.So let’s go for circuit understanding.

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