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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.
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