Troubleshooting Guide - Sanyo LCD-37XR8DA Service Manual

2. Troubleshooting guide

2.1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
no
Check if 5VSTB of X802 9#
on main board is normal?
no
Check STANDBY circuit of
power supply board
yes
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 power board and
no
Check the backlight
control circuit on the
main board
blue
yes
back light board
21
red
Check if the PIN11 of X802 on
main board is high-level?
yes
Check power
supply board