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I am using ups of 600va from zebronics, my ups is not turned on when i pluged it to the power card.when i opened it, i found a resister and a diode in the input area was burnet out i replaced it and n

I am using ups of 600va from zebronics(model : ZEB-U700), my ups is not turned on when i plugged it to the power card.when i opened it, i found a resister and a diode in the input area was burned out i replaced it and now the ups is getting on but i get power in both the terminals of plug point at the back of ups help me

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Check the way you soldered the register and diode are of same value..and see to that it is soldered in a proper manner

Posted on Nov 30, 2012


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017

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SOURCE: I havd a Dell Dimension 8200 that sometimes shuts

Thank for the detail, it really helps...
Most people forget about the power supply. If the power supply overheats, it will shutdown. When shutdown, it will cool off then operate again.

A power supply goes by WATT ratings, the average size power supply is now 450 watts for an average system and should cost around $60.

good luck and don't forget to vote.

Posted on Oct 12, 2010

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SOURCE: respected sir,

If you plug the UPS into the wall it should automatically charge up the internal battery.

Posted on Apr 28, 2011

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SOURCE: HP Pavilion will not power up

Yes pwer in entering since the LED lights up but most probably your SMPS orpower supply has fried due to a voltage surge. Try replacing the Power supply unit and see if there is any difference(use a working SMPS for trial and if this works, you have the solution...........sodeep

Posted on Mar 30, 2009

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SOURCE: replace power switch

No, The Green wire or wires are ground and go directly or in-directly to the frame or casing.
The White and Black are your two outside leads.
One is neutral and the other is hot.
If you run the green wire to either of these two leads, you will have a major problem..

Posted on Nov 15, 2009

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SOURCE: bought a PCI-E graphics card

some PCI-E cards require a special 6 pin power adapter, be sure that yours is connected if it is required.

I know that some PCI-e cards also require lots of power, if you are using a power supply less than 300 watts, your system may not be able to handle it.

also, check your BIOS settings. Your PC may still be trying to start off the on board video rather than the new PCI-E card.

Posted on Aug 09, 2010

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Whirlpool microwave keeps opening high voltage diode

If you do not have any experience in the repair of microwave ovens do not engage in their repairs because it is one of the most dangerous household appliances and the consequences can be disastrous. According to your description, low voltage circuit (220V or 110V) works well (light, turntable...). Obviously the problem is in a high voltage (HV) circuit which is made up of the magnetron, HV diode (rectifier), HV capacitor and HV fuse or protect diode. Failure is in any of these components in "HV circuit" or sometimes in interlock switch assembly or PC Board.

First, you must be sure which diode is blowed, reactifier or protect diode.

To check magnetron following this procedure:

Discconect the mains supply.
Check that the capacitor is discharged (by resistor 100 ohm / 10W or more).
Discconect the magnetron.
Measure the resistence between the disconnected terminals (should be app. 0.5 ohm).
Measure the resistance between the supply terminals (both) and earth. The resistance should be infinite.



Mar 12, 2015 | Whirlpool MT4155SPS


How to troubleshoot a power supply board.

After a power surge or thunder storm your TV, DVD, Amplifier or anything with a power supply will not turn on or partially turns on with errors. Your unit may also be many years old and has quit while operating or after shutdown it would not turn on.

If this is the circumstances of your unit you need to first unplug the unit from the mains for safety and remove the cover(s) or back if a TV to access the power supply board.

You will no doubt need to do some sodering so see my tip at for help with soldering.
The first thing you should check is the fuse although with switch mode power supplies you do not find blown fuses very often these days. Using a DMM set to the ohms range (preferably continuity check) check for an open fuse. If there is continuity the fuse is good. If the meter reads a high resistance the fuse is open and needs replaced. Always replace with the exact kind and size (amps) of fuse you take out. Generally these days the fuse rating is marked on the circuit board near the fuse.

Restore power to the unit and try turning it on. If your replacement fuse blows you have a short somewhere in the system. Any boards which will not affect the unit turning on should be disconnected and the fuse replaced and try to power it on again. If the fuse does not blow the problem is in one of the circuit boards which are not hooked up to the power supply. If the fuse blows the problem is in any boards still connected or the power supply.

To troubleshoot the power supply look for any charred or burned components. Look at the electrolytic capacitors to see if the ends are bulging. If they are all the electrolytics should be replaced. Electrolytic capacitors look like small cans, usually different colors but they could be black. They will be marked in microfarads and have a dc voltage rating. They should only be replaced with exact units, same values for both parts of the rating. Also they have a polarity and must be installed the same way they are taken out. The negative terminal is marked on the board and on the device.

If all the capacitors look ok or you replace them all (they are cheap) continue checking all diodes for shorts or opens. Out of the circuit a diode should read high resistance one way and when the leads are reversed you should read about 400 to 800 ohms. This is showing a good part. The DMM should have a diode check setting. It is the location with the symble of a diode beside the position. Diodes can usually be checked in circuit to determine a ball park estimate of whether they have a problem. Remove any which seem suspect and check them out of circuit. Make sure they are reinstalled correctly. They have a polarity also. Line the symble on the device up with the one on the circuit board.

After the electrolytic capacitors and diodes all the transistors (mainly power) should be checked for shorts. If they are shorted you will find them in circuit. Any suspicious units can be removed and tested with a DMM. Testing is done similar to a diode except there are two junctions to test. You should have low resistance between two different sets of leads and high resistance between all others (out of circuit only).

The only things left to check are the resistors. The easiest way to test them is with the meter on diode check make sure they are not in a dead short. Some will be low enough resistance they should test as a short.
They should be marked with the values. Resistors with a high resistance can be tested by changing the range or use auto range.

Any parts can be purchased at or or .

If all the components check out your power supply is ok and you need to do the troubleshooting on the remaining boards.

Thanks for using FixYa and for the great rating.


on May 10, 2011 | Televison & Video


Shorted Rectifier Diode (fuse keeps blowing)

This CRT tv is dead set, no reaction when the power button is pressed(no standby led light). I've open the back panel and check the faulty parts.

As you can see the fuse was badly burnt-out indication of excessive current due to short circuit.

I've checked the parts feeding the AC line to the power supply board (Power cord, VDR, Ceramic capacitor, Coil, Posistor, Degaussing coil) one by one and I've found out that one of the four rectifier diode has a leak which caused the glass fuse burnt-out.
Here's how to test the rectifier diode.

Good Diode
Note : Forward and reverse bias depend on what type of ohmmeter are you using, here I'm using a Japan Standard(Sanwa Brand).

Using an ohmmeter set it to X10 to see much easier the leak from the diode in reverse bias.

Forward Bias : test the diode by connecting the red test prod of the tester to anode and then the black test prod to cathode of diode. You will see the pointer will reads a faily low resistance(above picture).

Reverse Bias : test the diode by connecting the red test prod of the tester to cathode and then the black test prod to anode of diode. You will see at the picture(above) that the pointer didn't react (remains in infinity). This is a good diode.

Bad(leaky) Diode

Forward Bias will reads fairly low resistance.

Reverse bias unlike the good diode the pointer will also reads a fairly low resistance.

After confirming that the diode caused the fuse from blowing I've decided to replaced all four diodes since I have a lots in my stocks.

Remember that when you installing the new diode on the board, make sure that you will make it in the right polarity.


This steps is also applicable in the DVD Player,Flat panel, Projection, LCD TV, you have to disregard only the posistor and degaussing coil.

Have a nice day!
Thanks for using Fixya.


on Mar 02, 2011 | Televison & Video

4 Answers

How do you test a diod in the circuit

First of all it is called a diode and it is an active component. The way you test it is , first remove power from the circuit, then using a ohm meter on the high power ohms or diode test function. It should read high resistance in one direction and low resistance in the other direction you also can use a battery and light bulb in series connected to the diode. The light should light in one direction and not the other. If the diode is across a coil or low resistance device it may not be able to be tested accurately in circuit, in this case one end will need to be lifted from the circuit to test.

Aug 07, 2014 | Electronics - Others

1 Answer

Onan generator

test the generator diodes with an ohm meter you should see almost no resistance in one direction on a diode and a high resistance when you reverse the meter probes.if you do the diode is good if the diode reads the same in both directions it is either shorted or open. (diodes are like one-way streets for electricity)

Sep 30, 2013 | Electrical Supplies

1 Answer

Last week i was out of my home for a week so all the load was off. but when i returned i noticed that my Electricity meter was advanced by 25.2 Units and my 600VA Microtek Inverter was indicating the...

Please dont vote me down as I'm speculating at a guess. Please repost your question if i cant help you.
Do you live in an area with ice, water or snow. Do you have a power cord connected to it laying anywhere near those. You may have a short on any device. Batteries do lose charge though i'm not sure how much "units" means as a value. Power transformers generally have diodes, so you may have a problem with that to ground.
So check for shorts. Unplug everything, turn off charge power and see how much is lost over a day to test your batteries.

Jan 20, 2011 | Kitchen Ranges

1 Answer

Why would the high voltage capacitor go bad?

Hi and welcome to FixYa. I am Kelly. High voltage capacitors can and do fail when a microwave is used for long periods of operation, when the unit is operated with no internal load and sometimes for no reason at all other than the capacitor had an internal failure such as corrosion or a break down of the metal strips inside of it where the strips can make contact with the the case. I have been working on microwaves since the 70's and often there is no apparent reason for the failure of the HV cap.. They just sometimes fail.
However...... there is also a power diode in the microwave that is connected directly to one terminal of the HV Cap. If the power diode has failed it can cause subsequent failure of the HV Cap. The Sharp Power diodes can be found here:

You use and ohm meter on resistance to check the diode AFTER removing the terminal of the diode from the capacitor. NOTE: the capacitor must be shorted across the terminals at least 3 times with a screwdriver while holding the handle only to prevent a horrible shock.
Once the diode terminal is disconnected from the HV Cap read resistance in BOTH directions by reversing the test leads on the terminals of the diode. One direction will read resistance and the other direction it will read open / infinity. Any other reading is a failed diode.

You check the capacitor using an analog (scaled vs digital display) ohm meter on R X 1,000 or R X 10,000 and watch for a jump on the meter just as you touch the terminals EACH time you reverse the leads. No jump or... steady resistance = bad Cap.

Sharp Capacitors can be found here:

Just note that either a CAP or Diode failure can cause the main fuse to blow at the end of the power cord in the fuse holder.

Fuses are normally either 15 or 20 A Slo-Blo fuses and can be found here:

Thanks for choosing FixYa


Sep 29, 2010 | Sharp Dial Microwave R-21LCF Microwave...

1 Answer

I am using UPS of 600VA from zebronics company,recently my ups is not giving any backup,the moment power is off it is getting switched off. plz help me out,vat should i do now?

I would first check the connections to make sure the battery is connected. If it was working before it should be connected unless someone has removed it for maintenance, etc.

Other than that my next suggestion is more than likely either the battery is bad and not holding/accepting a charge, or the charging circuit in the UPS itself has faulted and is not sending charge voltage to the battery.

May 03, 2010 | Computers & Internet

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