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I would like to know if all the ac adapter for my PCG_K315S are so enourmous and heavvy or if there are other possibilities??
Hello And Welcome SweetBaby
You Can See what Sony Have On offer Here
You may find another power supply unit here , just fallow the Prompts . Hope It Helps
I have looked for the adapter for my vaio and there is only the large one it came with. can i use any 100-240v adapter it the socket fits my laptop; an adapter from a more expensive vaio laptop for example?
Best to be careful here, the voltage output of the adapter must match the input requirements of your VAIO - mine for instance requires 19.50V regulated from the adapter - so best to use the model-specific VAIO adapter.
Also stick to the official packages from Sony.