Follow these steps at your own risk.
1. Menu
2. System Setttings
3. OK (enter)
4. Manual search
5. 570 or 531 (but 531 seems not to work nowdays)
6. OK (Enter)
Wait for a while, ewalaaaaaaaaaa. Sometimes you will need to re-do these procedures in case channels have been lost or in case you configured automatic search again.
UPDATES: Currently both 570 and 531 codes are not working.