Fault and Operation of a TV Receiver

Electrical Engineering - Fault and Operation of a TV Receiver

Rectification of the Fault and Operation of a TV Receiver

To rectify the fault and operate the given TV Receiver (Dead Fault)

Components Needed

S. No.

Name of Component/Apparatus

Quantity

1.

2.

TV Receiver

Multimeter

1

1

Identify the Fault provided on TV Receiver

1.    Very the TV receiver is switched ON firstly

2.    There is no picture, raster and sound effects in it.

3.    Thus it confirms the receiver is within dead fault condition.

4.    Switch OFF the TV Receiver instantly.

Test the stages of the TV Receiver (referring to block diagram fig. 2)

1.    The TV receiver is switched ON firstly and calculate the AC input 220V/50HZ supplies if it is Correct.

2.    Test the ON-OFF switch if it is right.

3.    After that test AC Fuse, Bridge rectifier diodes section, DC filter condenser and resistors that related to power supply stage, if the voltage at the power supply is correct, proceed to next step.

4.    After that measure voltage at horizontal output transistor if it is low switch OFF the receiver instantaneously and check the horizontal output transistor if it is correct goes to next step.

5.    To Confirm the LOT (Line Output Transformer) is within fault condition. Eliminate the Fault LOT and Solder New one.

6.    Then Switch ON the TV receiver, TV operates as dead fault is repaired.

1154_TV Receiver Homework Help.jpg

Figure: Block diagram of television receiver

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