Wt is the reason for laptop produce buit rning smell when start? - 1

So that's definitely a problem with your cooling system. It probably has to do with the heatsink, the thing that basically conducts heat away from your cpu. It shouldn't cost too much to get it fixed, probaby under $120 I'd be willing to guess. But make sure you get it fixed because heat could really damage the components in your computer.

I think so your motherboard or the processor might be damaged and not the cooling system my suggestion is you take the lap to lenovo customer care and check exactly what is the problem and then you can ask for the price and solution with them

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