What is lcd datasheets

lcd datasheets

Troubleshooting linear power supply was quite easy as compare to switch mode power supplies SMPS . AC voltage enters to the primary side of linear transformer and then converted the AC into a lower or higher AC voltage depending on the secondary winding. The output AC voltage is then rectified and filtered by a diode and capacitors to produce a clean DC voltage. First the AC voltage will flow to a full wave rectifier bridge rectifier which produces an uneven DC output and then filtered by a large capacitor usually 220 micro farad and up to 450 volts . The clean DC voltage will then flows to start up resistors and to the input of switch mode power transformer. Once the voltage passed through the high ohms resistor start up resistors the voltage would drop to a value where it then flows to the VCC supply pin of Pulse width modulation IC. Once the PWM IC received the voltage it will output a signal to drive the transistor or FET and produces a changing in magnetic field in the transformer primary winding. Each of these AC voltage produced by the secondary windings is then rectified, filtered, and regulated to produce a clean DC voltage. One of the main DC output voltage is the B that supply to flyback transformer for TV and Monitor Circuit The output from the B voltage supply is then connected, through a “feedback” loop which consist of optoisolator ic and an error amplifier TL431 IC , back to the PWM IC. When the voltage from the B supply rises or drop a bit, the PWM IC will act to correct the output. Any SMPS that comes across my repair bench, I would not immediately repair it, in fact I will take couples of minutes to analyze the circuit design and see it from all angles before I begin to repair. Troubleshooting SMPS is not limited to only one procedure in fact many electronic repairers have their own unique ways and methods to solve SMPS problems.
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