Troubleshooting Guide - Sanyo LCD-19XR7 Service Manual

3. Troubleshooting guide

3.1. No raster
Turn-on power supply, check
if the red indicator is light in
the STANDBY?
no
Check if XB1 PIN3(5V) of
main board is normal?
no
Check STANDBY circuit of
power supply board
yes
Press POWER button in the
unit or sensor control and
check the indicator.
Check if the PIN9,10 of XB1
in main board is high-level?
Check back light board
no
Replace NS2
blue
yes
no
Check N801 and its
peripheral circuit
16
red
Check if the PIN11 of XB1 in
main board is low-level?
yes
Check power
supply board