Sanyo LCD-42XR9DA, Service Manual

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2. Troubleshooting guide
2.1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
Check if 5VSTB of X802 9#
on main board is normal?
Check STANDBY circuit of
power supply board
Press POWER button on the
unit or sensor control and
check the indicator.
Check if the PIN3 of X804 on
main board is high-level?
Check if the PIN11 of X802 on
main board is high-level?
Check power
supply board
Check power board and
back light board
yes
no
no
red
blue
yes
Check the backlight
control circuit on the
main board
no
yes