UPDATE 1-SK Hynix board approves plan to invest in Toshiba chip unit

* SK Hynix to invest 395 bln yen

* May take stake of no more than 15 pct of chip unit in future

* Toshiba says aiming for a signed deal as soon as possible (Adds details from statement)

SEOUL, Sept 27 (Reuters) - South Korea's SK Hynix Inc said its board had approved its participation in a consortium led by Bain Capital that plans to purchase Toshiba Corp's memory chip unit for 2 trillion yen ($17.7 billion).

SK Hynix said in a statement it will invest 395 billion yen.

Toshiba's board agreed last week to sell the unit, the world's second biggest producer of NAND chips, to the Bain group. However, the signing was delayed because consortium member Apple Inc demanded new terms on chip supply in return for funding, sources familiar with the matter have said.

The SK Hynix statement did not mention whether the deal had been signed or not. A spokesman for Toshiba said the firm was aiming for a signed deal as soon as possible.

The Bain-led consortium will hold 49.9 percent of the voting rights in the chip unit, while Toshiba will hold 40.2 percent and Japan's Hoya Corp will own 9.9 percent, the statement said.

Of the 395 billion yen to be invested by SK Hynix, 129 billion yen will take the form of convertible bonds, which later may be changed into equity equivalent no more than 15 percent of voting rights.

The Bain-led consortium also includes Dell Inc, Seagate Technology Plc and Kingston Technology. ($1 = 112.8100 yen) (Reporting by Joyce Lee and Hyunjoo Jin; Editing by Edwina Gibbs)