MANI
BOARD
FAULT
JUDGMENT
Getting rid of power's trouble
Getting rid of display's trouble
In stand-by mode, the negative port of
D 1 2 , 5 V S p i n h a v e 5 V v o l t a g e
？
If the internal power, the 13PIN port don't
connect with AD board ,is it have 5V?
U21output 3.3V
？
U24 output 1.3V
？
Maint en anc e int er na l
p o w e r m o d u l e
Maint en anc e U2 1 and
U2 4 ne twor k mod ul e
Do it can display by the
remote controlle r or key ?
Check U21
、
U24 modue
and relative network
Check U6 power supply
、
resetting
、
the cry stal is OK?
Check 5Vi pin and 12VIpin
outp ut 5V and 12V
？
Check STB pin is H level and
inte rnal power module
OK
N
Y
N
Y
N
Y
N
Y
N
Y
Panel cable have a good touching and
i t h a v e a g o o d c o n n e c t i o n ?
LCD panel is OK ?
Rep lace the LC D
CN17 component have
w e l d e d t o g e t h e r ?
Replace cable and
connect corre ctly
Weld the CN17 component
Replace main IC 9E19
Y
N
N
Y
Y
N
IF the Display is not normal picture
9
1
.
display part(skewbald display)
