LG Electronics on Friday said its second-quarter operating profit is estimated at 664.1 billion won (US$574.5 million), posting a weaker-than-expected performance apparently on sluggish smartphone sales.

The operating profit for the April-June period marks a 13.6-percent jump from the 584.6 billion won posted a year earlier, South Korea's No. 2 tech giant said in a regulatory filing.

Sales came to 14.5 trillion won, also up 3.9 percent from a year earlier.

LG did not announce the performance of each business division. The company is set to release the finalized earnings report later this month.

Analysts said while LG managed to post a strong performance for the home appliance business, the television segment's profitability fell due to the increasing price of panels.

The mobile business is also presumed to have remained weak on sluggish sales of the flagship G6 smartphone, analysts added. Experts estimate the sales of the G6 smartphone to have fallen short of the target of 2 million units.