Sanyo LCD-22XR8DA - Troubleshooting Guide

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2. Troubleshooting guide
2.1. No raster
Turn-on power supply, chec
k
if the red indicator is light in
the STANDBY?
Check if PIN1(5V) of X401
on main board is normal?
Check STANDBY circuit o
f
p
ower supply board
Press POWER button on the
unit or sensor control an
d
check the indicator.
Check if the PIN9 of X401 on
main board is low-level?
Check if the PIN11 of X401 o
n
main board is low-level?
Check power
supply board
Check back light board
yes
no
no
red
blue
yes
Check the backlight
control circuit
no
yes