Rectification of Blue Retrace Lines Fault and Operation of a Colour TV Receiver:
To rectify the blue retrace lines fault and operate the Colour TV receiver.
Components Needed:
S. No.
Name of Component/Apparatus
Quantity
1.
2.
Colour TV Receiver
Multimeter
1
Identification of the Fault in a given TV receiver:
1. Very the TV receiver is switched ON firstly.
2. There is no picture just only blue retrace lines on the screen.
3. Switch OFF the receiver immediately and confirm blue retrace lines fault given TV receiver.
Check the stages of the TV Receiver:
1. First Switch 'ON' the TV receiver
2. Only blue retrace lines on the screen.
3. Measure the voltage at the blue cathode if it is low
4. Test the components related to blue cathode.
5. Test the IC and Transistors, related to blue cathode
6. Test the picture tube base.
7. If the picture tube base is fault remove and solder the new one.
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