Troubleshooting Guide - Sanyo LCD-26XR7 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 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 PIN12 of X301 in
main board is high-level?
Check back light board
no
Replace NS4
blue
yes
no
Check N102 and its
peripheral circuit
17
red
Check if the PIN11 of X303 in
main board is high-level?
yes
Check power
supply board