When playing from my Pioneer dvd recorder DVR-545H on the Philips 46PFL9704H/12 tv i have NO sound!

The recorder is connected with a scart cable in ext1 on the tv. With any other tv it is working fine, but not on this LCD/led tv.

Please help!!

Software info tv

Release for TV543:
Q5492-0.26.78.0

Generation date:
9/07/2010 11:01:10