Akai LEA-19V07P - Page 11

TV can’t search any
channel/no picture
6、Function Trouble（TV video）
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
data for I
2
C
N
Y
Check if t1-pin9&10have data
NY
Check if T2-pin2 for variational
voltage within 1.8V~4.3V
NY
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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