I'd be more concerned with the revised operating profit for Fy15 now becoming an operating loss. At least while Sony has positive cashflow they remain solvent. This is the first year in ages they haven't paid a dividend and the projected operating loss is seems to be the real the reason for this. In some ways it's like Sony is using whatvlooks likens big scary number, which isn't really scary, to draw attention away from the smaller but scarier operating loss.
Accounting write downs are quite handy as a tax dodge esp when you have operating profits. But when you have to use cash reserves, or borrow, to pay the bills because you have negative cash flow that's almost always bad.
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