Questions and Answers
What is the expected voltage output from the secondary windings of the transformer stage?
Which electronic component might exhibit a 'leaky' defect?
Which stage of the power supply is responsible for converting AC to DC?
In a washing machine, which component is primarily responsible for the rotation of the drum?
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What is the function of the inverter board in an LCD TV?
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What function does a rectifier diode serve in conjunction with a high-voltage capacitor?
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Which fault is commonly associated with the timing control board of an LCD television?
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What is one of the remedies for the defect of distortion shown on the screen due to issues with the inverter board?
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Which defect is linked to the main board of an LCD television?
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What issues could arise from a malfunctioning jack pack section in an LCD television?
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Study Notes
Power Supply Voltage Outputs
- Transformer primary windings operate at 250VAC.
- Transformer secondary windings output 50VAC.
- Rectifier stage provides 50VDC from diode outputs.
- Filter stage maintains 50VDC at capacitor terminals.
- Final output from the regulator stage is also 50VDC.
Electronic Component Defects
- Diodes: Can be OPEN or SHORTED; check with Rx10.
- Capacitors: Possible faults include OPEN, SHORTED, or LEAKY; use appropriate range according to capacity value.
- Transistors: May be found SHORTED or OPEN; check with Rx10.
- Resistors: Can be SHORTED, OPEN, or exhibit CHANGE IN RESISTANCE; testing range depends on the third stripe.
LCD Television Components and Functions
- LCD Front Panel: Produces visual output.
- Backlight: Illuminates the display.
- Power Board: Converts AC to DC, distributing power.
- Mainboard: Coordinates functionality of various components.
- Jackpack Section: Houses ports for external devices.
- Inverter Board: Converts DC to AC for backlight.
Common LCD TV Faults and Remedies
- Timing Control Board: Faults include white display, no display, and double images; remedy involves replacing the board.
- Inverter Board: Issues may manifest as distortion with vertical bars.
- Main Board: Can cause multiple faults on the screen.
- Power Board: May present with vertical or horizontal lines across the display.
- Jack Pack Section: Can lead to screen issues if defective.
- Speakers: Symptoms include no power or low power output.
- Liquid Crystal Display: Can fail with white display and intermittent power issues.
Washing Machine Components and Faults
- Motor: Responsible for rotating the drum; failure may result in weak or no pulsator rotation.
- PCB: Control panel location.
- Timer: Sets wash cycle duration.
- Fuse: Protects against electric overload.
- AC Chord: Connects the washing machine to the power source.
Common Washing Machine Faults and Remedies
- No Power: Check AC chord, fuse, or dirty contacts; inspect with an ohmmeter.
- Weak Pulsator Rotation: Inspect motor windings for fault.
- No Rotation with Motor Sound: May indicate defects in the capacitor or timer.
- Water Drain Failure: Check belt and gearbox for proper functionality.
- Pulsator Rotates in One Direction: Faulty components like the rubber plug may need checking.
- Heat Not Produced: The magnetron may be defective; also check oven lamp and test components individually.
Microwave Oven Components and Functions
- Magnetron: Produces microwaves for heating food.
- Oven Lamp: Illuminates the chamber.
- High Voltage Transformer: Steps up the primary voltage.
- Waveguide: Directs microwave flow to the cooking chamber.
- Turntable: Ensures even heat distribution.
- High Voltage Capacitor: Doubles high voltage from the transformer with the help of the rectifier diode.
- Thermal Cut-out/Thermostat: Protects against overheating.
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Description
This quiz covers foundational concepts related to power supply voltage outputs and common electronic component defects. You'll explore the functions of various parts in an LCD television, from the power board to the mainboard. Test your knowledge and understanding of basic electronics.
