Function
trouble
(
ATV
)
MANI
BOARD
FAULT
JUDGMENT
TV
can
'
t
search
any
Channel
or
no
picture
Check
the
soure
of
RF
Check
power
ci rcu it
Q11
,
L18
Cha ng e
tun er
Che ck
the
RF
si gna l
Check
the
5V
on
P I N 7
o f
T 1
Check
12C
of
T1
Pin4
/
Pin5
Che ck
the
si gna l
ou t
of
T1
Pin8
Check
the
circuit
of
12C
and
U15
N
Y
N
Y
N
Y
N
Y
Check
the
circuit
of
SW1
/
TDA9885
/
6
Che ck
the
ci rcu it
Q14
Cha ng e
to
TV
Check
the
CVBS
out
of
T DA 9 8 8 5
/
6
P i n 1 7
Check
the
input
signal
o f
C T 6 2 2 E
P i n 7 8
Check
the
software
wheth er
corr ect
Che ck
the
sour ce
s e l c t i n g
T V
Upload
software
N
Y
N
Y
N
Y
N
Y
OK
10
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