Hi.
Common problem with grundig boxes is leaky electrolitic caps in psu, Can cause lots of different problems from stuck in s/by, blocking up picture, No signal.
Psu kits are available to repair the grundig boxes.
You will need a decent soldering iron with a tip of 1.5mm to 2mm & desolder braid.
Kits are available from CPC uk you can order parts online.
chris, November 2005