Hardware Trouble shooting
-12-
5-6) Function Trouble (TV video)
TV can’t search any
channel/no picture
Confirm if the RF
cable do have signal
cable do have signal
N
Y
Check if T2-pin7 for 5V
Y
N
Check if T2-pin5,6 has
I
2
C signal
N
Y
Check if t1-pin9&10have signal
N
Y
Check if T2-pin2 for variational
voltage within 1.8V~4.3V
N
Y
Check the circuit
from T2-pin9&10 to
U12
Check the circuit
in this part
Change T2
Check the I
2
C circuit
(between T1-pin5,6
Check external
RF
signal source
Check the
power
supply
circuit
and the power
supply for U12
in this part
and 82,83)
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