* Taiyo Yuden jumps 20 pct after share buyback announcement
* Machinery, auto stocks outperform
* Isuzu Motors soars after its Q3 results cheer investors
* Toshiba falls on forecast concerns
TOKYO, Feb 12 (Reuters) - Japan’s Nikkei surged on Tuesday, rebounding from a one-month low, as shares of exporters such as automakers and machinery makers enjoyed strong demand thanks to a weaker yen.
Taiyo Yuden skyrocketed 20 percent after it said its net profit for the April-December period jumped 58 percent and raised its dividend payout outlook. It also said it would buy back 2 million of its own shares, or 1.6 percent shares outstanding, worth up to 3 billion yen.
The Nikkei share average rallied 2.6 percent to 20,864.21, after closing at the lowest level since early January on Friday. Japanese markets were shut on Monday for a holiday.
The dollar has gained against the yen over the last week, pushing up earnings prospects for machinery, auto and electronics products makers. It was up 0.2 percent at 110.58 yen on Tuesday.
Advantest Corp rose sharply by 5 percent, Mazda Motor climbed 2.7 percent and Panasonic Corp added 3.2 percent and Hitachi Ltd advanced 1.8 percent.
“Short-term traders such as hedge funds are seen selling the yen and buying stocks,” said Yutaka Miura, a senior technical analyst at Mizuho Securities.
Most exporters expect the dollar to trade between 105-110 yen for the fiscal year through March. A weaker yen boosts Japanese exporters’ profits made abroad when repatriated.
Isuzu Motors soared 7.8 percent after its operating profit for April-December increased 17 percent to 144.13 billion yen thanks to strong sales of pickup trucks in Asia.
But Toshiba Corp tumbled 5.9 percent after the Nikkei business daily said that the company is set to slash its operating profit forecast for the year through March to between 20 billion yen and 30 billion yen, with growing costs in sectors like energy dragging down earnings from core operations.
Toshiba said that the Nikkei report was not based on something the company announced, but the figure is close to what the company estimates.
Rental apartment operator Leopalace21 Corp nosedived 19 percent for a second day, plunging to a daily limit low of 335 yen after the company posted an extraordinary loss of 43 billion yen related to repairs and construction defects.
The company said on Friday that it is moving 14,443 residents out of their homes to repair defects found in more than 1,300 buildings nationwide. Leopalace dived 19 percent on Friday.
The broader Topix gained 2.2 percent to 1,572.60. (Editing by Kim Coghill & Shri Navaratnam)
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