UPDATE 3-Qualcomm outlook off but shares up after Samsung deal

* Q4 Rev $2.69 bln vs Wall St view $2.72 bln

* Sees FY rev $10.5bln-$11.3bln vs Wall St view $11.6 bln

* Extends deal with Samsung

* Samsung will make $1.3 bln downpayment

* Shares rise in after-hours trading (Adds executive comments, share price)

NEW YORK, Nov 4 (Reuters) - Wireless chip supplier Qualcomm Inc (QCOM.O) on Wednesday forecast weaker than expected full- year results, but its extension of a key deal with Korea's Samsung Electronics (005930.KS) helped offset the disappointment for some investors.

Qualcomm forecast full-year revenue of $10.5 billion to $11.3 billion, below Wall Street expectations for revenue of $11.61 billion, according to Thomson Reuters I/B/E/S.

The company said it expected earnings of $2.10 to $2.30 per share in the full year of 2010, below the $2.32 expected by analysts on average.

While the results were disappointing, analysts said that given the shares had fallen 9 percent since late September, a lot of softness had already been priced in.