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4. Representative symptoms
(1)
no picture, no sound, no raster
Check
if
indicator
turns red when
power on
Yes
If
indicator
light turns blue
when turn on
Yes
Check
XB7
+5V of 3# and
+18V of 5#
No
Power
board
output or +5V, +18V
short to the ground
Check if the speakers work
normal at other channel
Check if flash write
the correct software
the
No
Check if +3.3V-stby of
light
XB7 9# on main board
is normal
Check +9V of
No
XB7 1# on main
board
Yes
Check the power
supply of main
Yes
CPU,DDR(CB47
-3.3V,CS80-1.8V,
C434-2.5V)
Yes
no
No
Power board no output or
+3.3V-stby short to the
ground
Yes
IR board has problem.
Indicator light is damaged
No
Power board no output or
+9V short to the ground
There is problem
lie in IR board
NB10，NS03，N404 and
No
their
problem
Main CPU NS02, DDR
N400&N402,
NA02 or their periphery
have problem
41
periphery
have
FLASH
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