Hisense LHD32D33EU - Function Troubleshooting (TV Fault)

5.3.7. Function Troubleshooting (TV fault)
TV can’t search channel, o
r
no signal
external RF input
signal is ok ?
N
Y
Y
Chec
k
if the Pin 1 of UT2
is 3.3V
Chec
k
the pin 16,17 of UT2 I
2
C signal
Y
Y
Chec
k
if the pin 6 voltage of UT2 is right
？
N
N
Chec
k
if the pin 9/10 of UT2 has signal output ?
N
Y
Chec
k
circuit
between UT2
and U1
N
N
Chec
k
external RF
equipment
Change U1
UT2
b
adness ,
change it
Chec
k
IF-AGC
Circuit
Chec
k
I
2
C
network and
make sure
U1 is ok
Chec
k
this
pin ‘s power
supply