Insignia 19KK44 Service Manual page 61

（5）Fail to search TV channels
Fail to search TV channels
Check if voltage of Tuner-4#/7# is 5V ?
Yes No
Check out 5V circuits from
Check if I2C1 bus is normal ?
power board to Tuner
No Yes
Check out peripheral Check if there is output from
circuits of I2C1 bus Tuner-16#/17# ?
No Yes
Check out Tuner Check out main chip