Vaio laptops look great and generally have a high spec. Owners give glowing reviews after buying them but they are not reliable machines and there are recent models, which don't work, starting to appear on eBay. I'd be wary of helping this friend any further. Taking a laptop apart is difficult and if you don't know what the problem is it's foolhardy. Most repairs would be expensive. You've already done more than could be expected of you.