Haier L22B1120 Service Manual page 48

5）TV failure
Fix the RF
set
Check if there
is I2C signal
at PIN6 &
PIN7 of TUNER1
N
Check the I2C
circuit
between
U11 and
U24
TV no channel
Check if there is RF
N
Check if there is
+5V at PIN2 of
Check if there is
intermediate
frequency signal
Y
output at PIN12 of
Check the
tuner
- 47 -
signal input
Y
U24
Y
U24
Check the signal
circuit between
U11 and U24
Check the power
supply circuit to
N
this PIN
Y