Power diode ru20jgf blows off

IC chip 102 is a TNY276PN Off-Line Switcher Chip. I believe Power Integrations, Inc makes them. Make sure your power supply Zener diode ZNR101, along with your bridge diodes D101 through D104, (and, for good measure) D105 are all okay just to make sure they didn't short out and blow IC102.

Good luck!

The secondary output voltage comes out from is more than it should be there. That is why, the protection zener diode blows off, as soon as you switch ON the set. First find and repair the power supply regulator, for correct output voltage. Refer its repair book for details. After repair include the zener diode in place. OK.

Check its speaker and audio output circuit.

plyback of sharp aphrody 21v

Some of the parts of the power is shorted try to check the regulator and the diode. But be sure to unplug the unit before checking the regulator and the diode. Feel free to send feed back good day and best regards.

Yes its a Zener Diode

The cost should be about 26 to 30$.

theres a shortage in the circuit try check the rectifier diodes at primary power supply section, not dangerous to little knowledge,refer to a qualified service technician

usually this will blow fuse,short bridge diodes, & vent or blow main a/c ripple capacitor

Hi,

Try checking the reverse protection diode. This diode would normally be connected right after the power connector and would be the biggest diode inside. One way to verify if this is defective and causing the fuse to blow is even with the power switch at the OFF position, the fuse will still blow.

If on the other hand, the reverse protection diode is good and fuse will not blow when power switch is at OFF, then the short/defective component is inside. There would only be two (2) major components that can cause the fuse to blow with the power switch to ON, the final transistor and/or the audio IC.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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