XOCECO LC-42FE32, Руководство по обслуживанию

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3.1 No raster, no picture and no sound
Note: The soldering quality of resistor rows between N30, N31, N32, N33 and N3 is very important,
if it has problem, DDR may fail to work properly.
No raster, no picture and no sound
Check the input voltage
Is the blue indicator
lights?
Disconnect the power supply board
with the data processing board, and
then measure 5V_IN
Check STANDBY
and 18V, if they are
short to the ground,
open circuit, or
component damaged
The power supply
board fails to
work properly
Check the output of
DC-DC on main
board Check STANDBY,
check if 5V_IN is
normal.
Check if there are
short or open circuits
on correlative circuits
Check if the voltages of
correlative circuits on high
frequency board are normal
There are short or open
circuits on correlative
circuits Print track information from
serial port to make sure the
problem of correlative module
Is the power indicator lights?
No
Yes
Normal Abnormal
Normal Abnormal
Normal Abnormal
Yes
No
Abnormal Normal
Normal Abnormal