Daewoo DSC-3220E/3220L STR-F6654 general description, Power supply primary part operations

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Service manual SC-150

5-9 Power supply (STR F6654)

5-9-1 STR-F6654 general description

The STR-F6654 is an hybrid IC with a build-in MOSFET and control IC, designed for flyback converter type switch mode power supply applications.

5-9-2 Power supply primary part operations

An oscillator generates pulses signals which turn on and off a MOSFET transistor.

5-9-2-1 Start-up circuit : VIN

The start-up circuit is used to start and stop the operation of the control IC, by detecting a voltage appearing at VIN pin (pin 4).

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Contents

Chassis SC-150 Contents General description Main PCB Union PCB Main Features Power consumptionSound Output Power Tuning systemSvhs Pin Signal Description Matching value Page C01 C02C03 C04639.25 S10 S11S12 S13Program Group Skip Special case Country selection = OthersITV Safety instruction RAY Radiation PrecautionOrder Default settingh for SC-150 Alignment instructionsParabola HOR WidthOption HOR Paral BOW HOR Width Corner EW Trapez IC description VCTPage Page IC version VCT 3832A VCT 3834A Chassis IC marking OSD languages Atss countries TextPin Name Type Short Description Gndaf Supply AGC Page DSP-Section Audio Baseband Processing Analogue SectionNicam plus FM/AM-Mono German 2-Carrier System Dual FM SystemPAL SECAM-LUssr AdrselResetq DvsupDvss VREF2Features ANAIN1Testen XtalinPin Symbol Function OUT1 GND1OUT1+ ModeTDA8946J Page GND Block diagram TDA6107Q SDA SCLPage Pin Name Symbol Description VIN OVPIIN H TJ TSDDescription IC Pins Symbol Rating Unit I2C Decoder SW1 SW0SW2 SW3IN3 OUTIN1 IN2VEE Circuit description If section Block diagram Vision if Amplifier Standard Features FPLL, VCO and AFCPage Page Adaptive Comb Filter VCT3834A only Video Sync Processing CRT Measurement and Control Page Configuration Stand byDescription Application Forced KEY Page ESC Quadrature MixersPage Page Power supply primary part operations STR-F6654 general descriptionPage STR-F6654 oscillating operation Overcurrent protection function OCP Latch circuitThermal shutdown circuit TSD Overvoltage protection circuit OVPTV start-up operations TV normal run and stand-by mode operations Page FBT SC-150 Controlled Rectifier 6V DC High Service Parts List Cord Power Oxide Film 2W 1.2 OHM J Small Semi Fixed CCZB1H561K Cera Carbon Film Metal Film Carbon Comp PA01A RF27 RD-4Z221J Different Part List by PCB & Micom Version Main PCB Union PCBJumper DEL JumperExplode View PCB Main PCB Union Schematic DiagramMAIN Schematic DiagramUNION