Soaraway sales of the Galaxy smartphone drove record quarterly profit of $5.9 billion at Samsung Electronics, though the South Korean tech giant is sweating over how Europe's debt crisis is denting demand in its biggest market for televisions and home appliances, Reuters reported.

The flagship Galaxy smartphones are likely to have stretched their lead over rivals Apple and Nokia - despite a parts shortage that meant it struggled to keep up with stronger-than-expected demand for its latest S III model.

While strong handset sales grab the headlines, more than doubling profit growth, other businesses such as chips and consumer electronics are battling weak prices and demand and a limping euro, which eats away at repatriated profits.

In a sign that the euro zone crisis is exercising minds in boardrooms around the globe, Samsung executives said this week the group was operating to a contingency plan.

"Europe is our biggest consumer electronics market and we may have to initiate cost cuts and product price increases should the euro fall further from the current level," said one executive who didn't want to be named.

"Our smartphones are flying off the shelves, with some outlets reporting 40-60 percent sales growth, but that's distorting the overall trading outlook which is more challenging due to the weak global economy and a weak euro."

The euro has fallen around 5 percent against the Korean won since April, and about 8 percent in the past year, to 2-year lows.

In its April-June earnings guidance on Friday, Samsung, valued at $170 billion and the world's leading maker of TVs, smartphones and DRAM memory chips, estimated operating profit jumped 79 percent to 6.7 trillion won from a year ago - in line with an average forecast in a Reuters survey of 23 analysts.

That would be 14.5 percent higher than the previous record quarterly profit in January-March. Samsung estimated its second-quarter revenue at 47 trillion won ($41.4 billion), just below a 50 trillion won forecast.

"Revenue is below our forecast, which suggests price pressure was more severe than had been expected in products such as televisions and home appliances," said Nho Geun-chang, analyst at HMC Investment Securities in Seoul.

"Earnings will be stronger in the current quarter as sales of the high-end Galaxy S III will increase dramatically and drive the telecom division's earnings to above 5 trillion won," he said, predicting shipments of the S III would hit 19 million this quarter.

Samsung is due to release its full second-quarter results - the first since former components chief Kwon Oh-hyun took over as CEO - towards the end of this month.

Samsung and local rival LG Electronics are among the few global TV makers making money and gaining market share from stumbling Japanese rivals Sony, Panasonic and Sharp.

But, spooked particularly by a weak chip market, Samsung shares have dropped 15 percent in the past two months, while the broader Korean market has fallen just over 5 percent, and Apple has gained almost 3 percent.

On Friday, Samsung shares dipped 1 percent to 1.173 million won ($1,000), while the broader market was off 0.4 percent.