7.No tuning channels
DTV or ATV no Channels.
No tuning
channels
Signal setting
OK?
Change setting/
tune again
Replace signal
source
Upgraded
software OK?
Check TV
settings
Tune again
Tuner power/
crystal/I2C bus
OK?
Check & replace
power flow/crystal units
Replace main
board
Replace tuner
IC/MCU
Replace main
board
End
43