Advertisement
6、Function Trouble（TV video）
N
Check external RF
signal source
Check the circuit from
T1-pin8 to U21-pin24,25
and the power supply for U21
TV can't find any channel/no picture
Confirm if the RF cable do
have signal
Y
Check T1-pin11for signal
Y
Check T1-pin2 for
variational voltage
changeT1
Check T1-pin 7 for 5V
Y
Check T1-pin4,5 for I
N
(U6/NT68F631-pin16,17and U26
1.8v~4.3V
Y
N
Check the circuit
N
2
C
Check the power
supply circuit
N
Check the I
2
C circuit
pin35,36)
Advertisement
