Picture 5 Function Unit
(ATV broke down)
N
Check
external
RF
equipment
Y
Dose U7
work
normal
and
it’s
network
Y
N
Check I2C
data
network’s
connection
to
U13(MSD306P
T) #A6,W6 pin
N
Y
N
Check the
network of
MSD306P
T #y3,aa3
pin
Y
Does Tuner have any signal output?
N
Y
Change
Tuner
Does power supply of
U7
N
Y
Check
circuit of
MSB1210
、
Crystal
Oscillator
and SAW
filter U14
Check
the
power
supply
network
TV not searching/no image
E
x
t
e
r
n
a
l
R
F
i
n
p
u
t
s
i
g
n
a
l
W
h
e
t
h
e
r
o
r
n
o
t
n
o
r
m
a
l
Check tuner VCC whether has 5V
Check Tuner’s I
2
C data
Check U14 #4pin whether has signal or not
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