Sanyo LCD-42XR7H, Руководство по обслуживанию

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