XOCECO LC-27W18S Service Manual - page 27
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2. Troubleshooting guide
No
Yes, turn the unit on
No
Yes
No
Yes
No
No
( 1) , No raster, no picture and no sound
Is the power indicator lights?
Yes
No
No
Yes Normal Abnormal
Abnormal Normal
Normal Abnormal
Connect the power
A red indicator lights?
Check Power supply, infra-red board, CPU and
its periphery circuit (flash) and power cord
A blue indicator lights?
Check if the pin 42 of CPU is square-wave; check
the periphery circuit of CPU and FLASH/SRAM
Does backlight light up
Check backlight board, CPU pin 77-backlight
control condition.
Check if the display of each
channel’s video signal is normal
Check the signal inputted from the channel to pin IC
is normal or IC and its periphery is normal or the
output of LVDS is normal
Check if the display of each
channel’s audio signal is normal
Check the signal inputted from the channel to pin IC
is normal or IC(TPA3008D2/MSP3410) and its
periphery is normal
No raster, no picture and no sound
Check Standby5V
Is the blue indicator
lights?
Disconnect the power supply board
with the data processing board, and
then measure Standby5V
Disconnect CN902, and then
find out that which part fails
to work properly
The power
supply board
fails to work
properly
Check I2C
bus of the
system
Check the power supply
of CPU(N301) and
FLASH(N302)
Check the capacitor of
L301 and the periphery of
CPU and FLASH
Check the pin 10
of CPU is high
level or not