Dell 1909Wf Service Manual
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Service Manual5Chapter 3- CIRCUIT THEORYBlock DiagramThere are 4pcs PCBA in this monitor, one is power& inverter&Audio board whichis a single layer board, one is interface board including USB HUB 1up/2down,one is keypad which is OSD control, and one is USB stretch board located on theright side back cover. The system(2FFCLs) block diagram as below(fig.1)INL836MOSFETTransformerLamp1Lamp2AC Input90V~264VAC Line FilterLD7575PWMControlRectifier&Filter CircuitPowerTransformer Feedbackand OVPPhotocoupler+16V DC output+5V DC outputBrightness ControlON/OFF ControlFeedbackControlTo IF BoardPowerMOSFETRegulatorDC to DC12.5V to 12VSpeaker outTo Panel CCFLSnubber&Schottky Snubber&Schottky+12.5V DC outputSnubber&SchottkyFor audioFor audioINVERTERPOWER |
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