LG Electronics Inc. on Tuesday estimated its second-quarter operating profit jumped 146.9 percent from a year earlier to a record high, driven by robust sales in its home appliance business. Operating profit is expected to total 1.57 trillion won ($1.02 billion) in the April-June period, compared with 639.4 billion won a year earlier, the company said in a regulatory filing. Revenue rose 14.9 percent on-year to 23.82 trillion won, also a record. Net profit was not immediately available. For the