My Japanese 703 'POWER On' problem had been fixed. see the following link :
http://www.mobile-files.com/forum/showthread.php?t=16444&page=2&pp=10
If You have sames case/problem,
1. Download JP 703 Full flash files (3 files)
2. Use SETool, add 3 files, press 'Flash' button.
3. After flash, remember press 'Unlock/Repair' button.
4. Phone is alive
(press POWER key to start)
Phone is fallback to locked version, you want to flash 'Testmode',
you can use search function in this forum, enjoy it.
P.S.: Many Thanks all guys from ima-mobile and mobile-files
provide some methods for me to solve my problem......
Many Thanks !!!