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How to test 5v ic regulator(3 pins)

Greetings Sir

Please help me how to test the 3 pins voltage regulator using  the VOM,i have no other spare parts to base-on..

Thank you..

Francis

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  • sdnizamud Mar 02, 2009

    Is there any way you can test KIA7805 out side with just multimeter, because in some equipment the regulator IC are installed in such a place that you can't test the voltages with the probe. my email address is sdnizamud@hotmail.com. If anyone knows how to test regulator IC with normal multimeter just guide me.

  • Dave Dec 07, 2012

    Try this link it might help http://www.learningaboutelectronics.com/...

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Most chips are as follows pin 1 input voltage pin 2 common gnd pin 3 volts out ie 5vdc connect vom meter to it as follows black lead to middle pin red to pin in right if you can read the print on the chip set vom to vols dc and check it

Posted on Dec 03, 2007

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Francis, 3 pin voltage regulators have the following;
1 pin is INPUT, let`s say 12 volts
1 pin is OUTPUT, let`s say 5 volts
1 pin is GROUND, all electronics equip. has to have a ground
the problem is they are not all wired internally the same so how do you tell which is input pin and which is output pin ? the best way to find this info is find the data sheet on-line. Google the letters NTE and click on their cross reference link and then enter the number on the front of your regulator and it will cross your device to NTE`s device and show you the info, hope this helps you, Happy Holidays BMW Rider

Posted on Dec 01, 2007

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1= this happen because th IVR fail, see the diagram and test it use the DVOM OR VOM for test the IC .l
2= test the thermistor or sensor for defective.
3= if the voltage of IVR is out of regulation in this case +12vdc,test for ground.if is o.k test by the side of battery side of the IVR, if this voltage is present replace the IVR, if regulated voltage is withing specifications, test the printed circuite from the IVR to the gaues, and if there are open circuite replace the circuit board. OF course test the fuse too.
God bless you

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Tip

How to measure the voltage on TV


Voltage measured on DC scale, black cable multitester / avometer put on a negative path or can be slipped on the silver wire in the tube that is not disposable wrapping.

Next, measure the voltages are available:
  • For 180v voltage can be measured on the positive pin elco (10uf/250v) in PCB RGB tube.stick pin red wire multitester
d3f355a.jpg
  • Voltage 110v for TVs 14 "-21" and 130v for 25 "-29" in the B + FlyBack Transformer (FBT), find the path there is elco 100uf/160volt. measure on a positive foot elco.
  • For 12volt voltage, please measure at the foot of the right edge of IC 7812.
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  1. For voltage 5V, please measure the right foot of IC 7805.
  2. For voltage 33v, please search at the foot of VT in tuner.
  3. To measure 90v-300v, scale use DCV 250.
  4. To measure the 12v-40v, use a scale of 50 DCV
  5. To measure the voltage of 1V-9v, 10 DCV-scale use.
  6. How to measure the voltage on the yoke and in plyback is;
    • From the yoke horizontal = Fcc 110v DC, 1000 V. AC voltage can be removed with a red plug in output and in use as dB meter.
    • From the yoke pertikal 24 DC current model, except for disposable coupling C = 1 / 2 Fcc. While it could be IC 120V AC (with dB meter)
    • At Fcc FBT kolector; 110v DC, AC voltage = 1000 V..
    • At Fcc FBT filement / heater = 5V-5, 5V AC.
    • In the FBT 20-32k anode voltage V measured with 40kv HV probe is added to the multitester 1000 V. DC.
    • Voltage others depending on model and type of TV. 180v out there (for RGB) directly from the regulators, transformers, Video Amp taken from FBT.
    • There are 24V and 46v vertical FBT, also 12-18V depending on brand and type.
    • Voltage 600 V DC and focus around the screen 400v DC.

    Thus tip n trick from me (AGUS YUSTIARA ), hopefully useful.
for more info , at http://trend2download.blogspot.com


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For a 5 volt supply go to this WEB site,
http://schematicwiring.com/simple-electronic-applications/5v-dc-regulator-with-3-pin-regulator-circuit-schematic-diagram/
For a variable voltage power supply go to this WEB site.
http://www.engineeringslash.com/power-supply/three-terminal-adjustable-regulator.html

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