Sharp LC-22LE240E

57
LC-22LE240
TROUBLESHOOTING
21. TROUBLESHOOTING
21.1. No Backlight Problem
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.
Possible couses: Backlight pin, dimming pin, backlight supply, stby on/off pin
Backlight pin should be high in open position. If it is low, please check Q181 and panel
cables.
Dimming pin should be high or square wave in open position. If it is low, please check
S16 for Mstar side and panel or power cables, connectors.
Backlight power supply should be in panel specs. Please check CN705 for MB62, related
connectors for power supply cards.