Tip & How-To about Televison & Video

Fuse keeps blowing (LCD,Projection,Standard,Flat panel TV.)

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!
Thanks for using fixya


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1 Answer

tv won't turn on like it's unplugged but it's not

I have seen the same problem with my tv's and the like. Depending on the age of the unit, I could sometimes find a blown fuse inside (safety feature). Many electronics especially tv's are extremely fussy about power surges. Even times when I knew there was no power surge, I would find a blown fuse inside the unit, keeping power from ever reaching it's destination. Like you said. tv behaving like its off because no power getting through

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we didnt have a surge protector on our tv we purchased from home shopping net. and lihtning came in the line and i guess hit our tv can it be fixed or is it worth fixing price wise i hate to throw it away .its a 32 inch digital lifestyles

Look at the power supply module, most of them will have a surge protection devices (called MOV, same as used in common surge power strip but cannot handle big surge that power strip can handle) installed to protect minor surge, it should blow the fuse. Once MOV blown, it will more likely stay short circuit, if you put the new fuse in it will blow the fuse right away. You need to see if the MOVs blew up any sign of blown up components.

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Have a Toshiba MW24F11 combo tv. Near lightning strike through surge suppressor. Will not turn on. 6.3 amp fuse blown; replace, blew again. Next step, or start looking for replacement. Set is 25 months old.

power surges generally damage diodes and capacitors causing the fuse to blow, any reputable tv shop can repair for a fraction of replacing this set.

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Time for a replacement. In the future, get a power surge protector that protects not only your power cords, but also your cable input/outputs to your receiver and tv. They're a little pricey, but definitely worth their weight in gold!

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