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Astrange reason DELL M5110 notebook dark screen failure A dell m5110 notebook display verydark. There are not seven times alarm sound when starting up. The current isnormal. According to the repairing experience, usual it is the graphics card problem. Displaying is normal when connect an externalmonitor. So, we weld the graphics card again, but the failure can not be fixed.Check the cable of lcd and the resistances and capacitances near interface ofLCD, all are ok. We found the screen become light when I press the bluetoothmodule. So we find the cause of the dark screen fault : the bluetooth module isnot installed well, it is not close contact. So we installed the Bluetoothmodule again, The fault is resolved, The screen display normal.
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