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13.Troubleshooting
A. No Backlight Problem
Problem: If TV is working, led is normal and there is no picture and backlight on the panel.
Possible causes: Backlight pin, dimming pin, backlight supply, stby on/off pin
BACKLIGHT_ON/OFF pin should be high when the backlight is ON. R119 must be low when the
backlight is OFF. If it is a problem, please check Q10 and the panel cables. Also it can be tested in
TP50 in main board.
Dimming pin should be high or square wave in open position. If it is low, please check S60 for Mstar
side and panel or power cables, connectors.
Backlight power supply should be in panel specs. Please check Q33, shown below; also it can be
checked TP53.
TROUBLESHOOTING
55
LC-22LE250
LC-24LE250
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