Dell Vostro 3515 - Disassembly and fan cleaning - Laptop repair

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To clean and apply new thermal paste to your Dell Vostro 3515, first disassemble the laptop. Then gently wipe away the old thermal paste from both the processor and the heat sink using a soft, lint‑free cloth. Apply a small amount of new thermal paste to the processor and reassemble the laptop, ensuring the heat sink is secured correctly by tightening the captive screws in the specified order.