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Probe off Does not register reading. red light is not burning

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Loss of complete power on js48ppdbdafridge checked circuit breaker, cord and outlet. I would like to check the main board with ohmmeter not sure how. Can you please provide as well as any other cause.


Be extremely careful as a small mistake could result in severe shock, serious burns, explosion or even *****. 1. Ohms meter 2. 2 probes (red and black colors) Tip: *Insert the red probe into the slot marked V (+) *insert the black probe into the slot marked COM (-) *Turn the rotating knob at the centre of the digital multimeter to the reading/marked indicator V~ (700value) **make sure you can see V~ and that it matches the color of the 700 value Crosscheck this last part very well please. (V~ 700value) **Switch the digital multimeter on (observe that it reads 000 on the display screen) **hold the test probes by the plastic handle, apart and in either hand. *approach the Main circuit board, where you have the breaker. **Balance yourself well on a firm support and make sure no part of your body makes contact with the Main panel whatsoever (you have live mains active) *without allowing the test probes to contact or touch each other, insert the exposed metal tip and touch the live cable, (red for the supply line, exposed part) with the red colored test probe **follow up by touching the black colored test probe (exposed tip) to the black cables Remember; no part of your body must contact any metal part of the mains circuit board/panel Remember, Both test probes must make contact at the same time with the live and neutral lines you are testing **check the value displayed on the screen of your digital multimeter A safer option is to keep your Mains board switched on and then observing the precautions as outlined above, insert the test probes into the socket/power outlet/receptacle on the wall (point where you insert the plug of your fridge on the wall) Switch the wall socket on. Each test probe goes into different slots/holes on the wall socket please. Take your reading on the DMM

Oct 14, 2017 | Exercise & Fitness

1 Answer

Positive and negative points


Use a multimeter to test the contacts, the red probe on the multimeter is positive. When you place the red and black probes on the battery contacts and the meter reading is negative then the red probe is on the negative contact, if the reading is positive then the red probe is on the battery's positive terminal.

May 13, 2013 | Electronics - Others

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How do i identify the negitive and positive terminals on my 18 volt batteries.


About the only way to do that is with a multimeter, preferably digital. Touch the probes onto the contacts and if the red probe is on the positive terminal, the reading will be a straight reading, eg. 18.6v. If the black probe is on the positive your reading will be a minus (negative) reading. eg, -18.6v. If you are using an analogue meter, you have to be quick or you will damage the instrument. If the red probe is on the positive terminal you will get a reading. If the black probe is on the positive reading the needle will go of scale below the zero point. Use a high voltage setting to minimise the input to the meter.

May 31, 2011 | Dewalt Accessories Batteries 18 Volt

1 Answer

The green light is blinking on the supply unit but it not coming on or booting up , i need to know if the supply unit is bad


Close examination of your power supply may reveal if the psu is bad.

When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.

You can also smell if there is a burning inside the psu.

See if the fan inside the psu is working if not then its a clear indication of a bad psu.

Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.

Measure also the output voltage when there is a load in the power supply. Connect a CD-ROM drive or hardisk and measure again the voltage. Dropping of voltage when put some loads is a clear indication of a bad power supply unit (psu).

I hope this will help you.
Thank you for using Fixya!

Jan 11, 2011 | HP ATX-300-12Z (ATX30012ZBD) 300-Watt...

2 Answers

When my computer starts the power light will blink and the fan starts. When the computer first had problems it froze and the fan turned on and wouldnt stop. I also smelt a burnt rubber smell. I read to...


Yes the voltmeter measures the voltage.
When you power up the computer to test the voltage on the 4 wire connectors.
Test the voltage red and balck wire should read 5 volts.
Test the voltage yellow an black wire should read 12 volts
If the burning smell is from the power supply then most likely a capacitor has blown in the switch mode power supply.
I would advise you purchase a new power supply, do not try and repair it, these mains devices can be dangerous if you don't have knowledge.

Sep 14, 2010 | HP Pavilion a705w PC Desktop

1 Answer

I have a f350 crew cab 1997 5.8 and while drivin and after take off the truck loses power and shakes then stops seems like only when accelerating this happens.


Hello! There are two sensors that will cause this problem both can be tested...If you have a volt meter...If not, let me know...
#1 is the Throttle Positioning Sensor (TPS)...A black round device that is bolted to the throttle body with a three wire connector...Wire colors are...Gray/White...Brown/White...And Gray/Red...Using two safety pins plug them into the rear of the in place connector on the Gray/White...And Brown/White...Place + probe of meter set to read 5 volts on the Gray/White...And - probe on Brown/White...Start engine...At idle must read less than 1 volt (.85)...As you slowly increase throttle meter must rise smoothly to 4 volts at open throttle...If voltage jumps or acts erratic the sensor is defective...

#2 is the Manifold Absolute Pressure (MAP) sensor...Also mounted to throttle body...Three wire connector with the following wire colors...Light Green/Blue...Gray/Red...And Brown/White...Using the same technique...Pin the rear of the connector on the Light Green/Blue...And the Brown/White...Place + probe on Light Green/Blue and - probe on Brown/White...Turn key to on (don't start)...Record reading...Move Light Green/Blue probe with safety pin and push it into the Gray/Red wire...Record reading....Also check the vacuum line which is connected to the Map Send results...

Cost...TPS=$55............MAP=$95

Guru.................Saailer

Aug 27, 2010 | 1997 Ford F350 Crew Cab

1 Answer

No blue power light and doesnt turn all the way on no starting beep gateway gt5220


I would suspect a bad power supply. Before doing anything make sure power is actually getting to the computer. Check the power cord with a volt meter. You should have around 115 volts. If all is well you need to see if the power supply is putting out the correct voltage. Open the PC up and set the multimeter to DC voltage.
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply. Curtorsey: IT Professionals

Mar 09, 2010 | Gateway GT5220 PC Desktop

1 Answer

Lights stay on in fridge


HI. The door switch will be the culprit here.

The interior light in most refrigerators, and the fan in some, are controlled by a door switch. When the door is closed, the switch is depressed and the interior light goes off and the fan resumes normal operation. If the door is misaligned or the switch malfunctions, the refrigerator may become warm as a result of the non-operation of the evaporator fan and the heat generated by the interior light. Test the switch for continuity using a multimeter. Set the multimeter to the ohms setting X1. Place a probe on each terminal. The multimeter should change from a reading of infinity to zero when the probes touch the terminals. With the probes still touching the terminals depress the switch, the reading should change back to infinity. If it does not pass both of these tests, the switch should be replaced.

Dec 10, 2009 | LG LFX25960ST Stainless Steel French Door...

1 Answer

Power supply suddenly 'dead'


You check the power supply using multimeter. but before everything make sure the you are getting power from the power outlet.

Here is how you can check the power supply with multimeter

If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

Mar 22, 2009 | Computers & Internet

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