Sanyo LCD-47XR7H, Руководство по обслуживанию

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3. 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