You mention you reset the EEPROM, assuming you did that correctly and nothing changed, then you can try a blank replacement EEPROM, and if that does not work, a preprogrammed EEPROM to rule out a failed EEPROM. Maybe you can elablorate on what you did.
If you are absolutely certain the voltages are satisfactory, and if you feel it worthwhile and accept there are no guarantees, then source a replacement of the main board. After finding the PSU to be OK and without a replacement PSU to be certain as far as possible, I'd be looking towards the main board.
A local TV engineer may be able to assist, or someone else may have some further advice.
Failing that, unfortunately I don't have a main board available but someone else may if you put a message in the wanted section of this site.
Another option, the main board is available from suppliers in the UK. One such which will dispatch to Sweden by courier is below:
http://www.lcd-plasma-parts.co.uk/index.php?route=product/product&product_id=13616Good luck. Hope this helps,
low.flying.pigs