I do electronics as a hobby. I have a good knowledge on most components, by testing them, but ICs always bring me to a halt. Your video has helped me a lot and also saved me some money.

Nice job, a lot of people don't seem to realise nowadays just how much fault finding can be done with a good multimeter. When I first started servicing Microcomputers, a Multimeter and Logic probe was all we were given . Scopes were non existent in most workshops and if there was one, only the workshop manager got to use it. The multimeter was king ☺. Keep up the good work

Thank you very much for your kind replies. I am just a retired pensioner trying to learn electronics to keep my mind active and hopefully repair instead of replace any electronics appliances I have at home also it fascinates me. Once again thank you for the videos they help me enormously.

@arvindthakker5842

2 жыл бұрын

Thanks for giving good lesson. About how to check. ICs

Awesome! You're a great teacher! Thank you for your thoroughness!

Thank you Mr. Mcdonald, great lesson.

This has been the best video explaining how to do this! I am working on a guitar pedal and because of your video, I was able to figure out that it had a bad IC. Thank you so much for the help!

Your work is awesome and a complete answer to the problem I have on testing ics

Thank you McDonald for such a detailed video on testing ICs with a digital multimeter. Its very fascinating as I like to work on electronic components. Initially I had put my meter on continuity mode and was testing but was getting no reading. But after seeing your video put the meter on diode mode and get good readings. Thanks a lot. Have subscribed your channel for more.

Just what I have been looking for. Thank you very much for this video!

Another great video, I have learned a lot from your videos.

Thanks man!! This is another easy way to check ic. Very helpfull.

Thanks a lot, now I'll test my inboards circuits and find the culprit :)

Thanks bro for ur knowledge! Very helpful!

Very nicely done. I was looking for a nice video to feed my morning hunger.

Thank you! 👍

Hi! I'm using this technique from some time now. It works also on very complex ic's in mobiles. But you have always to keep in mind the circuitry

THANK-YOU VERY MUCH MATE !!...YOU SOUND LIKE KENNY ROGERS !!

Nice info, thanks :)

Great job Sir 👏 Than you v much

Thanks for the video

Thank you very much sir for the lesson this will be very helpful

Little known trap ... The Fluke 87 were the electrical multimeters Not electronic multimeters & have different characteristics IE for the diode test it actually gives out a higher voltage than you expect from an electronics DMM and can damage ICs, especially of the 1.8v CMOS variety. Checked with Fluke personally after an issue on a production line. 👍

@PeepawMcDonald

9 ай бұрын

Interesting...This old coot only works on IC's from the 70's, 80's, 90' 00' and so on. I learned today from you. That there are CMOS versions of IC that are powered up from 1.8Vdc. What was the issue that you had on your production line. Just so we don't make any mistakes ourselves. Thanks for informing the rest of us :)

@SlyerFox666

9 ай бұрын

@@PeepawMcDonald If memory serves correct as it was about ten years ago a chap was using that Meter on the diode test to check a product when it came back for service/ calibration. After some tweaking and firmware updates they would then proceed to do some final checks across some test points on diode test, which was then damaging the 1.8v CMOS ICs. Yet it had been done this way for years ... We only realised what was going on when the meter under suspicion had been taken off the shelf where it was just used as a voltmeter as the usual DMM had gone faulty. we compared the output of one meter on diode test to the 87 an then got in touch with fluke who confirmed our suspicions, as I'd never heard of an Electricians DMM untill that point. 👍

Thank you for your sharing god blessed

Do you have a video on how to perform a bench test on a TNY278PN power integration chip with a multimeter?

Hi! I would like to know how to test other semiconductor such as diode, capacitor....

Thank you so much sir.

Nice explanation

Nice tutorial, I have mn3008 with 4 pins, just want to know if the same logic of testing applies.

Good checking thank you

Thanks my brother

I really like this method

what is the different of TTL and CMOS ICs... thanks

Thank you

Can this method be used to test all ICs?

This is great, thank you! What if the meter reads nothing on one or more of the pins? Most of the ICs I've tested are in the .615 range meaning good or 0.00 to 0.51 indicating a major drop, meaning a short. But some pins do nothing, just ".OL" on the meter? Does this mean something? Also several ICs in a row on a board have one pin that reads exactly the same, .194 Either this .194 pin is a normal reading over 10 to 12 chips or all of them are bad. I'm thinking they're fine because so many of them test the same on that one leg maybe you could shed some light on that? Thanks so much!

@ClbnaVGM

2 жыл бұрын

OL means it's not connected to anything (Open Loop). It is not a short and you'll see that on a IC schematic diagram it's written NC (No connection).

Excellent video! Can this test be performed with the TTL chip still connected on the circuit board?

@PeepawMcDonald

4 жыл бұрын

Hello and thank you for stopping by. I have used this method of hunting for shorted integrated circuits all the time on circuit boards. Watch my video on repairing a Fanuc I/O Board of short circuits in this link here. kzread.info/dash/bejne/dqxlx8-SmpDYk7w.html

@fixeverything4u

3 жыл бұрын

Is that a yes?

is this suitable for all kinds of ics? and why do we put the red lead on ground?

does this method of troubleshooting the same for Flat ICs ? example of TQFP

what if black probe placed on ground side?

Hye.. is the SAME with all types of IC ? Means.. this step .

Nice video man, Can you do this "in-circuit":? or do we have to remove the chip?

@user-uv4xe3cq2y

Жыл бұрын

Check 10:14 where it says on the screen 'yes' to your question.

thanks for a very nice video. would this method work with the IC soldered on the board? I feel the surrounding circuit might create all sorts of misreads on the chip I want to test.

@PeepawMcDonald

Жыл бұрын

kzread.info/dash/bejne/dqxlx8-SmpDYk7w.html Click on the above link of myself hunting for short circuits of integrated circuits soldered to an Input / Output Board.

@PeepawMcDonald

Жыл бұрын

Of course as you are correct you can have misreads on certain boards. Especially from Vcc to Gnd on modern motherboards. Where the Vcc to Gnd is +3Vdc, +1.5Vdc, and +0.7Vdc. On these motherboards to Vcc to Gnd voltage diode drop is unbelievably small. They are so small that I don't even bother testing for short circuits. But then most motherboards that do not boot up is caused by cheap electrolytic capacitors. You can visually see the tops of the electrolytic capacitors have bulged out.

@PeepawMcDonald

Жыл бұрын

Rule of thumb for your survival. Do not ship out to another planet or solar system on cheap electrolytic capacitors. You will not make it back to Earth. HaHa...

How did you set the multimeter for the IC test?

@PeepawMcDonald

2 жыл бұрын

Hello Beheaded Guitarist. I set my meter to diode test mode. I like fiddles, banjos, and dulcimers. But my Father many years ago taught most of our music around the guitar. We have to have music in our lives don't we? Great question, I hope my answer cleared up this procedure.

@KurtCobain2021

2 жыл бұрын

@@PeepawMcDonald thanks a lot

Can this be tested in circuit with this method?

Does this work for checking other i.c's such as the 555 timer, the op-amp and digital i.c's?

@user-pz6cx8zf2y

Ай бұрын

Yes!

sir can we check logic ics , also like this , in diode mode

So usually when there is a short in the ic multiple pins go to ground rather than just one pin? Is that true ?

@PeepawMcDonald

3 жыл бұрын

Yes, most times that is true. But as in life, this can also be false. HaHa. Thank you so much for stopping by and watching one of my videos.

@qc_uploads748

3 жыл бұрын

@@PeepawMcDonald 😄

Complete NOOB here. What does VS stand for, voltage supply, I'm guessing? And what is VCC? Bear with me, I'm learning a lot, with your videos. Cheers!

@PeepawMcDonald

4 жыл бұрын

Hello Mr. Warfield. I can remember some years ago being turned around and confused about the labels given to some pins of integrated circuits. Don't worry about being new to electronics. To this very day... To this very minute I learn something new about electronics.

@PeepawMcDonald

4 жыл бұрын

The term Vs stands for Voltage Source. It is the voltage applied to a circuit from a power supply circuit. The term Vcc stands for Voltage common collector. This is the positive power supply connection to TTL (Transistor Transistor Logic) integrated circuits. Or the positive power supply connection to an NPN transistor amplifier circuit. Both are only terms to indicate a positive power supply connection to the circuit.

@PeepawMcDonald

4 жыл бұрын

The voltage Vs (with respect to ground) can be any voltage. It depends on the person drawing the schematic and of course the actual power supply voltage required by the circuit. Usually Vcc is +5VDC. But here recently, we have seen micro-controller and micro-processor integrated circuits with Vcc as low as 3.3Vdc and 1.5Vdc

@PeepawMcDonald

4 жыл бұрын

So Vs and Vcc are the power supply connections to the circuits. I hope this helps in you journey of exploring electronic circuits. Stop by anytime. You are always welcome. I hope that you and your family are doing well.

@maxwarfield6699

4 жыл бұрын

Peepaw, you are THE BEST! Thank you so much for replying, I really am trying to learn, and your videos are a great part of that. Thank you for your explanations, I really do appreciate it. I am not in this field, at all, I'm just a guy trying to fix electronic stuff 'round the house. You don't talk down to us, like I feel, a lot of tutorial videos do - like a bunch of experts making videos, for other experts. The jargon is daunting enough on its own... Hey, again sincerly, thank you kindly Peepaw. Cheers!

👍👍👍

what if the ic has no diodes or it has diodes but thy are not shorted ? how to know if the ic is working for example how would you test a fan7382 ?

@PeepawMcDonald

3 жыл бұрын

I would find a datasheet of the integrated circuit on the internet. Then I would build the test circuit of the integrated circuit on a breadboard. Then dynamically test the integrated circuit using the datasheet. If the integrated circuit passes the dynamic test in accordance with the datasheet. It is good. Great question. Thank you for stopping by for a visit.

@MisterXS75

3 жыл бұрын

@@PeepawMcDonald thank you i was hoping in a quicker handy solution like you did in your video :-)

Well-done and informative vid. Ditch the "music"...it's just distracting and not needed. You might mention that you need the data sheet for each chip to know which pin is gnd.

@PeepawMcDonald

3 ай бұрын

The music stays. It saved my life...

@jameskeough4620

3 ай бұрын

@@PeepawMcDonald How can I argue with that? Also, does this test work for all ic's? My 555's 5 and 6 pins show way below the diode range. Please advise.

Why red on the ground and not black on ground? That is confusing to me, I am sure there is a good reason though

@kevinsmith-dn1px

4 жыл бұрын

You're not the only one, I'm thinking the same.

@knightwar3

2 жыл бұрын

GND pin is connected with all the anodes of the diodes from pin 11 to pin 18 and to test a diode reading you have to put the red lead on the anode and the black lead on the cathode

@justinjackson9705

Жыл бұрын

Because the current doesn't flow that way.

@user-pz6cx8zf2y

6 ай бұрын

​@@knightwar3This is correct, about testing the diodes of this specific IC, nevertheless we test in this way all the terminals of any IC, no matter if they are analog or digital. This test gives us a "leakage-like" picture (in millivolts DC) of any specific pin of any IC. This test is the "half" part of the V/I signature analysis being done by using an oscilloscope and an "octopus" external circuit, using the oscilloscope in X-Y mode. Practically, it's a dual polarity test of the same kind as with the multimeter, but far more superior than that...

@andreinistor6094

10 күн бұрын

You need to search how a diode works, I will give you a reference on what happen when you connect the probes in both ways but please search for more after this: When you comnect a positive pin to the negative pin of the diode, and rhe negative pin to the positive, the deplotion zone gets bigger so the resistence is higher When you apply negative to negative and positive to positive the deplition zone shrink, these being said the diode alows the curent to flow in one direction.

Hi sir hope you all the best .i just want to ask you .can digitals ic checked by multy tester?

@PeepawMcDonald

4 жыл бұрын

Hello Sir, truely I am not sure. For the last thirty years I have been using my trusty digital multimeter from Fluke. When I was in the USAF we had the PSM-6 volt - resistance meter. But back then when I was troubleshooting, I was only chasing broke wire connections. Haha. If I had my old PSM-6, I could test this method of troubleshooting integrated circuits for short circuits.

@PeepawMcDonald

4 жыл бұрын

Now if you get frisky, set your meter for the highest resistance range. Before searching for short circuits. The lower ranges of resistance measurements output more current that may damage the integrated circuit.

@PeepawMcDonald

4 жыл бұрын

Please sir, let us know how it goes. I miss my old PSM-6

How do I know what pin is ground? I am testing a CA3086

@PeepawMcDonald

3 жыл бұрын

Hello Mr Young. The CA3086 is four NPN transistors in one integrated circuit package. There is no single ground as you would usually have. You must test each NPN transistor as if were testing one NPN transistor with your digital multimeter. Nice question. Thank you very much for stopping by. If you wish you can find datasheets at this website www.datasheetcatalog.com/

❤

How to test sram chip?

Nice clear video, but why red on ground also no one ever seems to explain the reading of the different voltages this leaves the viewer or student very frustrated as we cannot correlate the readings only 0.001 or very low means a short to ground what about numbers from 12 to 600 please explain, many thanks for the video.

@PeepawMcDonald

4 жыл бұрын

Hello Sir, thank you for watching one of my videos. Please don't be frustrated. This is only a tool. And a tool to help quickly troubleshoot electronic circuits. Like any tool, some get used more than others.

@PeepawMcDonald

4 жыл бұрын

As far as the different diode voltage drop values that you see. Let us take one integrated circuit. The voltage drops for the inputs should be fairly close in value. The same for all the outputs. So If I have five outputs that measure close to 0.640V, and then one that measures 0.024V, I would call the odd one out the bad one.

@PeepawMcDonald

4 жыл бұрын

We are comparing good measurements to bad measurements. As far as seeing different diode voltage drop values. These are semiconductor devices. If we lived in the perfect world they would all have the same diode drop.

@PeepawMcDonald

4 жыл бұрын

And for the red lead on ground, and the black lead on all the other pins. As an experiment, try putting the black lead on ground, and the red lead on all the other pins. Do you get something higher than a diode drop? Let us know what you derive from your experiments. And try this experiment. Place your black lead on Vcc, and the red lead on all the other pins. Do you get good diode drops?

@PeepawMcDonald

4 жыл бұрын

I was taught this troubleshooting tool by Professor Charles Phillips. I don't know if he is still alive. That was many years ago. We lost track of each other. Take a look at the datasheets for the integrated circuits that you are working on. You will see why this method of troubleshooting for short circuits works.

Can these chips be tested this way while still in circuit?

@user-pz6cx8zf2y

6 ай бұрын

Yes, see the reference at 10.14 of the video.

I don't find this test reliable. I've tried several IC's, some new, and all have one or more pins out of the "good" range. (.350, .840, etc.). They can't all be bad, can they?

@user-pz6cx8zf2y

Ай бұрын

The test is reliable indeed, but it has a comparative character, which means that you should always compare the voltages you find from each pin of a known good chip (used as a reference) to each (same each time) pin of the suspected one I.e. pin 1 of reference IC to pin 1 of the suspected one, etc. There should be no voltage diffefence between the two (identical) pins, or very-very little one (:negligible).

What does it mean, when the reading you get on your meter is Over Limit, is that a short or something worse? Because that's what I'm getting, when testing a few 74LS90 ICs. Please let me know. Thank you kindly

@PeepawMcDonald

4 жыл бұрын

Hello Mr Warfield. I hope that all is well with you and your family. The "OL" on the DMM is not fatal. I see this on my Fluke digital multimeter when I am looking at an integrated circuit pin that has no connection (NC). On the 74LS90, pins 4 and 13 are labeled as no connection (NC). I hope this helps. Thank you very much for watching one of my videos. And I thank you for stopping by.

@maxwarfield6699

4 жыл бұрын

Thank you so much for replying. Your info is really helping me. I do as much as I can, on my own but sometimes, all this electronic stuff can becomes quite confusing for a novice, like me. Nice to have someone in my corner. Hey, all the best to you and your loved ones. Lead on, good sir!

How do you know what pin is the Ground

@PeepawMcDonald

Жыл бұрын

Hello Bruce, usually most TTL and CMOS IC's ground pin is pin 7 or pin 8. For 14Pin and 16Pin IC's. If it is unclear to me which pin is ground. I will hunt for a datasheet on the internet. My favorite website to find datasheets is datasheetcatalog.com I hope this helps you :)

@brucewalker1908

Жыл бұрын

@@PeepawMcDonald thank you very much.

Can we check all IC in this way ?

@user-pz6cx8zf2y

Ай бұрын

Yes!

Good jop

Finding shotr curcuit continuty mode

@chandranchandrankutty480

3 жыл бұрын

?

What did he call pin 9 I didn't quite get the name

@user-pz6cx8zf2y

Ай бұрын

Vs pin...

How to check 8 bit shift register? Viz. 74HC595.

hy

Can it be done without removing from the PCB?

@PeepawMcDonald

Жыл бұрын

kzread.info/dash/bejne/dqxlx8-SmpDYk7w.html Click on the above link of myself hunting for short circuits of integrated circuits soldered to an Input / Output Board. Thank you so much for asking. I hope you are doing well.