Haier MT5311 Manual page 84

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7. Function Trouble TV video
7. Function Trouble
N
N
Repair external
Check the network between
RF equipment
UM1(pin No. M19,M20) and U71,
and if the demod power is OK.
TV video
TV cannot scan
any channel/Picture
whether the external
RF input signal is normal
Check if pin No. 10,11 of T1 has IF signal to U71
C
Y
/
Check if pin No.7of T1(DVT-8C/T41F) is normal
Check if pin No.6,7 of T1 has I2C data
Y
f
10 11 f 1
N
Check if pin No.9 of T1
has voltage(1.8 ~3.3V)
Y
N
Check the circuit
Change
from U71(pin No.72)
T1
toT1(pin No.9,
Change U71
-83-
Y
Y
Y
N
1
Check I2C network
from T1(pin No.4,5)
to U71/5112
(pin No.68,69)
(pin No 68 69)
N
Check the
power circuit
of UP1(7805)
of UP1(7805)

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