Silicon Image (SIMG -8.7%) opens down sharply after warning it expects Q4 revenue of $59M-$60M, below prior guidance of $64M-$67M and a consensus of $65.7M. The chipmaker blames "the rescheduling of certain orders by a large customer," and says it expects Q1 product sales to be up Q/Q. Is that "large customer" Samsung? SIMG supplies MHL video transmitter chips for the Galaxy S III and other Samsung smartphones. Other key Samsung chip suppliers include MXIM, SWKS, BRCM, and ADNC.