5.3.7. Function Troubleshooting (TV fault)
TV can’t search channel, or no signal
external RF input
signal is ok ?
N
Y
Y
Check if the Pin 1 of UT2
is 3.3V
Check the pin 16,17 of UT2 I
2
C signal
Y
Y
Check if the pin 6 voltage of UT2 is right
？
N
N
Check if the pin 9/10 of UT2 has signal output ?
N
Y
Check circuit
between UT2
and U1
N
N
Check
external RF
equipment
Change U1
UT2 badness ,
change it
Check IF-AGC
Circuit
Check I
2
C
network and
make sure
U1 is ok
Check this
pin ‘s power
supply
Summary of Contents for LHD32D33EU
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