XOCECO LC27U7D, Service Manual

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25
Troubleshooting guide
1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
Check if PIN8(5V) of CPU
board is normal?
Check STANDBY circuit of
power supply board
Press POWER button in the
unit button and sensor control,
check the indicator.
Check if the PIN12 of X503 in
CPU board is high-level?
Check if the PIN12 of X501 in
CPU board is high-level?
Check power supply board
Check back light board
yes
no
no
blue
red
no
yes
Replacing N801
no
yes