Had same fault last year found it was fault in the Ignition switch. Radio powered by the 1st position on switch which seems to pop out when you take the key out. Changed power supply to radio now working fine! Also web link for a online manual enclosed
http://chevy.mrmax.dp.ua/EN/documents/Matiz/start_matiz.html
George
May 2008
I can answer this question...
Radio in a daewoo matiz doesn't work, no power. The radio is ok. Solutions?