SEOUL, Oct 29 (Reuters) - South Korea"s factory output snapped 10 straight months of year-on-year growth in September, dashing expectations for continued expansion, as global chip shortages hit production. Industrial production last month fell 1.8% year-on-year, Statistics Korea data showed on Friday, missing forecasts for 1.4% growth and down from a 9.7% expansion in August. On a seasonally adjusted monthly basis, output fell 0.8%, missing a median 0.3% decline forecast and following a 0.7% drop in August. read more A breakdown of data showed production of cars shrank 9.8% from a month earlier, while that of semiconductors and electrical equipments also slumped 1.6% and 5.2%, respectively. "September industrial output was weak as global supply chain disruptions were seen weighing on production in the manufacturing industry and on fewer working days," said Oh Chang-sob, an economist at Hyundai Motor Securities. The country"s biggest carmaker Hyundai Motor Co (005380.KS) reported a lower-than-expected profits on Tuesday as the global chip crisis drove down vehicle shipments and said it will take a long time to get back to normal chip supplies. read more That comes just weeks after its global chief operating officer said the automaker aims to develop its own chips to reduce reliance on chipmakers. read moreSeparately, Samsung Electronics Co Ltd (005930.KS) on Thursday said it expects component shortages to affect chip demand in the current quarter, even as it reported the highest quarterly profit in three years. read more On an annual basis, production for cars and metal products plunged 24.2% and 16.9%, respectively, offsetting a 30.6% expansion in semiconductors. Friday"s data also showed service sector output expanded 1.3% month-on-month in September, while retail sales jumped 2.5%, helped by the easing of COVID-19 restrictions at home. South Korea unveiled on Monday a three-phase scheme to scrap all limits on distancing curbs gone by February, except for mask-wearing mandates. read more