Dell E190Sf Service Manual
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Contents
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Service Manual5Chapter 3- CIRCUIT THEORY1. Block DiagramThis Block is comprised of interface board and switching power supplier board which is included byinverter for CCFL2. Electronic Circuit Theory2.1 Inverter PWM circuit2.1.1 Inverter Control circuit operations:(fig.2)Fig.2DC_5V through R1 and C1 will provide power for U1 on the pin2(VDDA),When the voltage at VDDAis less than ~3.4V,the IC will enter the lockout mode. The IC will resume operation when the voltage at pinVDDA exceeds an approximate 3.8V threshold.Pin3(SEL) used to select appropriate drive topologies,connecting pin SEL to GED shows the IC in theSnubber&Schottky+5V DC outputBrightness ControlPhotocouplerTo Panel CCFLFeedbackControlAC Input90V~264VPower PWMControl ICPowerON/OFF ControlRectifier&FilterCircuitLamp2 Lamp1To IF BoardInverterPWM ICSnubber&SchottkyFeedbackTransformerMOSFETPowerMOSFET+12V DC outputInverterTransformerAC Line Filter |
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