Tip & How-To about Televison & Video
A blown fuse is very common on Electronics Appliances like TV's, DVD's, Receiver's etc. Sometimes fuse blew because of power surge, replacing alone with exact volt/ampere cure the problem. It is necessary to understand that blowing of fuse second time around you replaced it means that you have a shorts in the circuit.
Troubleshooting the shorted parts on the power supply section needs an experienced in electronics because you will isolate the shorted parts one-by-one. Since we are working on the power supply section (110v/220v AC) this is fatal and can cause you an electric shocked with a simple mistakes only.
Usually shorts are quite near to the AC power line where you can locate this components :
1. Power Cord - Even a very low of chances for short but still to be checked because this is a part of AC line input. This is due to frequent bending and pulling, internal wire will shorts.
2. VDR (Voltage Dependent Resistor) this serves as a guard for voltage fluctuation or excessive voltage to avoid further damaged to other parts. If there was an over voltage(reach the peak allowable voltage designed by the manufacturer) from the AC line, this parts will vary its resistanceand drive the line to excessive current which causes the fuse from blowing.
3. Posistor (for standard TV) - connected here the degaussing coil.Check it also for shorts.
4. Rectifier Diode - Some unit this is come in bridge type package.
This is very common parts that are prone for shorts. For more info click this link
5. Main filter electrolytic capacitor.
6. Voltage Regulator IC/Transistor.
7. H-out Transistor (for standard TV)
8. Flyback Transformer- (for standard TV)
Isolation technique is done to locate the shorted parts. Pull-out the suspected parts one-by-one in the board and test it using the ohmmeter.
Hope that it may help you find the solution on your problem.
Have a nice day!
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Posted by Jdvillanue... on
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