Question 1

Service manual of an appliance or device under assembly and servicing is vital to the success of the job. To acquire a service manual this is a necessary thing to do.

Accepted Answer

Use the brand model and serial number of the equipment or device and search online or go to a reliable source to buy or find a free service manual.

Answer

Download the service manual of the appliance or device on any website in the internet for free.

Answer

Service the device without the service manual, it is not useful anyway.

Answer

Bring the appliance or device to the electronic store to buy the manual.

Question 2

What type of diagram found on a service manual that shows the different stages of the CRT TV that operates to process the Radio Frequency (RF) from the TV station to become a useful audio and video information

Accepted Answer

Block Diagram

Answer

Wiring Diagram

Answer

Pictorial Diagram

Answer

Schematic Diagram

Question 3

There are seven (7) basic steps in the standard procedure in the dis-assembly of Audio / Video products based on the EPAS Module 2 (Install Consumer Electronic Audio-Video Product and System). What step is to remove screws of the casing cover using appropriate screwdriver tip head, remove snaps, and fasteners using frying tool. Secure and classify screws and fasteners on to its individual containers?

Accepted Answer

3rd Step

Answer

4th Step

Answer

2nd Step

Answer

1st Step

Question 4

What should Jonathan do to know the condition of the suspected defective resistor connected to the service unit that is malfunctioning.

Accepted Answer

Remove the component from the board, set and calibrate the multimeter to ohmmeter range, test the resistor by getting its ohmmeter reading value.

Answer

Remove the component from the board, set and calibrate the multimeter to ohmmeter range, test the resistor by color coding its value.

Answer

Remove the component from the board, and check if it is burnt.

Answer

Remove the component from the board, set and calibrate the multimeter to voltmeter range, test the resistor by getting its ohmmeter reading value.

Question 5

What is the condition of the resistor with a color value of brown, black, red, gold if and an ohmmeter resistance reading of ZERO ohm.

Accepted Answer

Shorted resistor

Answer

Good resistor

Answer

Open resistor

Answer

Change value resistor

Question 6

Which of the following resistance readings of a resistor proves that the resistor has changed value and needs to be replaced.

Accepted Answer

Resistor color coded value is 1k, +/- 5%, Resistance meter reading is 1.7k ohms.

Answer

Resistor color coded value is 1k, +/- 5%, Resistance meter reading is 980 ohms.

Answer

Resistor color coded value is 1k, +/- 5%, Resistance meter No reading or Infinity.

Answer

Resistor color coded value is 1k +/- 5%, Resistance meter reading is Zero ohm.

Question 7

During the maintenance and repair of Audio-Video appliance the following are procedures observed. What should come first?

Accepted Answer

Interview or ask the client /owner about the service history of the device.

Answer

Inspect the device for any sign of physical damage or misused.

Answer

Pre-test the appliance for open or short circuits.

Answer

Record the service information of the appliance and secure the operation or service manual of the device.

Question 8

What is the cause of the problem of NO POWER audio-video devices? When the fuse keeps on blowing.

Accepted Answer

Short circuit on the power supply and load circuit.

Answer

Short circuit on the load circuit.

Answer

Short circuit on the power supply only.

Answer

Open on the power supply and load circuit.

Question 9

What is the appropriate troubleshooting and maintenance information for an LCD TV with NO DISPLAY problem, Sound Normal Channel and Volume Ctrl Normal symptoms?

Accepted Answer

Cause: Defective TCON Board.

Check point: VGL/VGH: Voltages required to turn TFT.

Repair Method: if voltage is abnormal replace or repair TCON Board.

Answer

Cause: Backlight is open.

Check point: Power supply to the LED VCC+ LED -.

Repair Method: Check if Back Light is ON and if it is ON, repair or replace the busted backlight.

Answer

Cause: Defective Speakers.

Check point: Test Speaker Terminals.

Repair Method: Check speaker resistance between 4 to 8 Ohms

Answer

Cause: LCD Module.

Check point: Voltages required to turn TFT.

Repair Method: re-check T-CON if the voltage is normal, replace or repair LCD

Question 10

When replacing a large value capacitor to avoid the hazard is to discharge it first and the best way to do this is by.

Accepted Answer

Discharge the capacitors by placing a 2.2 to 4.7 kilo ohms l0 watts ohms resistor on its terminal.

Answer

Shorting capacitor terminals with a screwdriver.

Answer

Using a 100W light bulb connected across the capacitor terminals.

Answer

Turn off the power of the circuit to discharge a capacitor.

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