Are Graphics Cards Replaceable in Laptops?

Hi.
I managed to overheat the graphics card on my laptop. Someone called me when I turned it on - and I forgot I left it on the bed. The system still works - it was a lower-end laptop when I purchased it. Already over 1 year old from time of purchase. Are graphic cards something that can be repaired/replaced on laptop? Or, laptops are usually integrated circuits - I should get whole new one? Thanks.

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