Dell S1909WXf Service Manual
Also see for 320-7459 - S1909WXF - 19" LCD Monitor: Setup guide
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Service Manual5Chapter 3- CIRCUIT THEORYBlock DiagramThere are 2pcs PCBA in this monitor, one is power& inverter&Audio board which is a single layerboard, one is keypad which is OSD control.The system function block diagram as belowThis PWA is included switching power supplier, inverter for CCFL and interface board.(fig.1)OZ9937MOSFETMOSFETTransformer1Transformer2Lamp1Lamp2Lamp3Lamp4AC Input90V~264VAC Line FilterSG5841PWMControlRectifier&Filter CircuitPowerTransformer Feedbackand OVPPhotocoupler+16V DC output+5V DC outputBrightness ControlON/OFF ControlFeedbackControl1234PowerMOSFETTo Panel CCFLSnubber&Schottky Snubber&SchottkyTo IF BoardFig.1INVERTER POWER |
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