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Introduction
TheIf the backlight of the display does lightlights up only for a few seconds, one reason iscould be a defective transformer in the inverter stage of the power supply.
In this case, a few windings of the transformer have ana short circuit, causing the resistance of the two secondary coils to be different.
The fault of transformer can be detected by measuring the temperature of the transformer left and right side using infrared thermometer or thermal imager. The temperature will differ greatly.
Power supply model number is BN44-00238.