MANI
BOARD
FAULT
JUDGMENT
Getting rid of power's trouble
Getting rid of display's trouble
In stand-by mode, the negative port of
D12,
5VSpin
have
5Vvoltage
？
If the internal power, the 13PIN port don't
connect with AD board ,is it have 5V?
U21output 3.3V
？
U24 output 1.3V
？
Maintenance internal
p ower
m od ule
Maintenance U21 and
U24 network module
Do it can display by the
remote controller or key ?
Check U21
、
U24 modue
and relative
network
Check U6 power supply
、
resetting
、
the crystal is OK?
Check 5Vi pin and 12VIpin
output 5V and 12V
？
Check STB pin is H level and
internal
power module
OK
N
Y
N
Y
N
Y
N
Y
N
Y
Panel cable have a good touching and
it have
a good
connection
?
LCD panel is OK ?
Replace the LCD
CN17 component have
welded
together?
Replace cable and
connect
correctly
Weld the CN17 component
Replace main IC 9E19
Y
N
N
Y
Y
N
IF the Display is not normal picture
8
1
.
display part(skewbald display)
