This excerpt taken from the LPL 20-F filed Jun 23, 2009.
Accrued Warranty Obligation
We record a liability for warranty obligations based on the estimated costs that we expect to incur under our basic limited warranty for our products. This warranty covers defective products and is normally valid for eighteen months from the date of purchase. These liabilities are accrued when product revenues are recognized. Warranty costs primarily include raw materials and labor costs. Factors that affect our warranty liability include historical and anticipated rate of warranty claims on repairs, calculated based on our sales volume and cost per claim to satisfy our warranty obligation. As these factors are impacted by actual experience and future expectations, we periodically assess the adequacy of our recorded warranty liabilities and adjust the amounts as necessary. Warranty expenses increased from (Won)46.0 billion in 2006 to (Won)77.9 billion in 2007 and to (Won)103.4 billion (US$81.9 million) in 2008. The increase in warranty expenses outpaced the increase in sales during these periods, mainly because while the increase in sales volume resulted in increases in both our sales as well as warranty expenses, the positive impact of increased sales volume on sales was partially offset by a decrease in the unit sales price of our products, which did not have a correspondingly negative impact on warranty expenses.