Same problem, I have repaired mine, but the fault may not be identical.
D703 on the power supply circuit (33v Zener) had failed. (not helped by R172 being fitted as a link I think, take that up with matsui design engineers!).
Do not attempt to fix this if you do not understand the dangers of mains electricity as components inside are dangerous!, however If you know any friendly electronics engineers then they will fix this for you if you ask nicely!!
dave
April 2011