Haier HL19KN1 Service Manual page 46

Function trouble
（TV video）
N
Check
external
RF
Signal
source
TV cann't searched any channel/no picture
Confirm if the RF cable
does have signal
Y
Check T1-pin8 for signal
Y
TCheck T1pin1for
voltage 1.8~4.3V
Y
Check the
circuit from
T1-pin8to
changeT1
U21-pin24,25
and the power
supply for U21
Y
Check T1/VA1Y1ED2002
Pin7for 5V?
Y
Check T1-pin4,5 for I2C
N
N
N
Check I2C circuit
Check the circuit
(U6/NT68F631
PIN16,17)
N
Check the
power
supply
circuit