Power Supply Repair : Basic Electronic Tutorial

[@biomedicalelectronicsengin7192]

Check Previous Power Supply Repair Video: kzbin.info/www/bejne/kKO3qn93fJpng7s

[@THOMMGB]

Thank you for doing this video. I like that you went slow and explained everything as you went along.

[@biomedicalelectronicsengin7192]

Glad it was helpful!

[@Acekicker277]

Interesting video. Need your help. My drilling machine charger became faulty, and when I opened it, I discovered the NTC was weak and broken. I got a new one and replaced it, and the charger turned on when I tested it before screwing it. After screwing it turned off.. Don't understand what happened

[@mdssolder]

Thanks for tutorial 😊 3:51

[@biomedicalelectronicsengin7192]

You're welcome 😊

[@JeffreyMendoza-xt5mv]

Wow ang galing Naman ninyo idol Ngayon may konting kaalaman na ako Kung paano mag diagnose Ng power supply. Salamat 😊

[@biomedicalelectronicsengin7192]

Salamat

[@OnlyOne1Dee]

Finally we have a biomedical Engineering tutor practically tutoring

[@penministries432]

Nice vedio.we want more like these ones.God bless you sir.watching from South Africa.

[@biomedicalelectronicsengin7192]

Thanks

[@peruibeawonderfulatlanticc3260]

you don very good work i had this problem in my power supply i will try as you done >>>>thanks agean hope you have more in futur

[@biomedicalelectronicsengin7192]

You are welcome

[@ksafan838]

You should be systematic in your troubleshooting. Follow the circuit: input then output, not haphazard. Component checking is like hit and miss unless you follow where the signal is getting lost.

[@timmooney7528]

It is a relatively simple circuit having very few components when compared to some power supplies. I too look for obvious failures beginning with visual inspection, then move to passive components considering there's not many to test.

[@prkacro]

thanks for the video.. greetings from Croatia !!

[@themad_engineer]

Just a question why don't you use the half approach, in the sense that you divide the circuit into two halved then test the halves individually and the half that isn't okay you divide it into half and test it again till you go down to a specific component

[@rku840]

Theoretically it is good to use the half approach but you need to switch on the circuit to test the in and out voltage and the risk of touching live wires is high. Going through component by component should not be a problem as you can see very few components are there in the whole circuit

[@sirjothtv4768]

Salamat sir, basic explanation and tutorial

[@eddielabiste8922]

EXCELLENT TUTORIAL IDOL, NAG SUBSCRIBED NAKO NIMO. THANKS

[@biomedicalelectronicsengin7192]

Thanks

[@conradztech]

Sir shoutout diyan sayo Godbless always..suporta mula sa aking mumunting channel..

[@biomedicalelectronicsengin7192]

Maraming salamat sir. More power

[@محمدنعمان-ر6م]

Please determine in wich voltmeter u set fir begginer

[@billypastor6667]

Very nice tutorial thanks for sharing ur video sir.

[@biomedicalelectronicsengin7192]

Most welcome

[@surgingcircuits6955]

What was the watt capacity of the original vs replacement(s)?

[@biomedicalelectronicsengin7192]

Same wattage. 1 watt

[@williamwoo1437]

You said 3 W in another reply

[@dexter7139]

Sir good evening pwede po ba ipagawa sayo yong baseus car starter jumper ayaw siya magcharge?

[@biomedicalelectronicsengin7192]

Sa Saudi po ako naka based. Marami po dyan sa pinas gumagawa nyan.🙂

[@dexter7139]

@@biomedicalelectronicsengin7192 ok po sir salamat, pwede ask kung may e recomend ka na andito sa pinas at salamat sir

[@tatabic1491]

Idol thank for sharing about open resistor .

[@biomedicalelectronicsengin7192]

Thank you too

[@rodym1681]

3:02 what is this component?

[@biomedicalelectronicsengin7192]

Optocoupler

[@rodym1681]

@@biomedicalelectronicsengin7192 what is the use of the optocoupler?

[@eustacehendrix9659]

@@rodym1681 It's a switch. 2 legs are connected to an IR LED and other 2 legs to a photo transistor that catches the light from the LED. This allows one circuit to turn on the other circuit while keeping isolated from each other. It's common in circuits where interference from the High Voltage circuit must not go to the Low Voltage circuit like audio, video and medical equipments.

[@ΠάριςΑζής]

@@eustacehendrix9659 An optocoupler, as it's name implies, is NOT a switch (although it can perform like that) but it is a device that couples optically (i.e. not electrically) two different circuits. Its purpose is a) to keep these two circuits electrically isolated, but also b) to allow the control of the circuit using its internal opto-transistor (controlled device) by the circuit using its internal photo-diode (controlling device). The type of control now, can be either digital (ON-OFF of a power device like a transistor), or analog, which is the case in this application. In other words, the light intensity of its internal photodiode represents the desired output voltage of the power supply, as its opto-transistor conducts in a linearly increasing (or decreasing) manner according to the infrared light density emitted by the photo-diode. Therefore, if the power supply output voltage tends to increase, then the photodiode emits more light, as the current within it will increase, forcing the opto-transistor to conduct more than before, informing the P.W.M controller that it needs in turn to reduce the width of its output pulses in order to have the output voltage reduced accordingly. Inversely, the procedure will increase the output voltage (in case the load demands more current) keeping the output voltage constant. So the optocoupler seems to be rather an optical controller, not a switch whatsoever.

[@englishrupe01]

Good job!

[@JMTUTORIAL]

Ayus bro watching bossing.

[@biomedicalelectronicsengin7192]

Salamat

[@juanpatino7472]

Hello friend. I have one power supply of light source storz but It is short already discard the rectifier bridge , switch transforme and IC. I test it with protection and it has intermittence without protection a mosfet burn me. What can you recommed me? Thanks.

[@biomedicalelectronicsengin7192]

Most of my experience from karl storz light source are transformer problem.

[@sanushkumar-v8c]

Power supply all have voltage but when footswitch is plugged the machine is not working. Voltage not coming why? Plz reply

[@FlorentinoJrEstil]

You've replaced resistor in very low power rating, soon that resistor will got hot and it will cause burn.

[@biomedicalelectronicsengin7192]

They are the same power rating 3W

[@FlorentinoJrEstil]

Pa shout out naman dyan Biomed from UAE Dubai.

[@biomedicalelectronicsengin7192]

On next video. Noted

[@FlorentinoJrEstil]

@@biomedicalelectronicsengin7192 Ilang taon kana dyan nag work Saudi?

[@biomedicalelectronicsengin7192]

@@FlorentinoJrEstil mga 9 pa lng.

[@mohammedshakir7540]

Thank you God bless you

[@biomedicalelectronicsengin7192]

Thanks

[@fixnreview]

Watching from Ormoc City

[@biomedicalelectronicsengin7192]

Thanks

[@alexandres8846]

diy load current tester is better for location burned o damaged components. 1 to 10 mah testing.

[@biomedicalelectronicsengin7192]

Yup

[@Schjoenz]

Anlakas ng music pero mahina boses boss. Pwede mo sya masama sa editing.. 😁 Salamat nga pala sa tutorial..

[@bulla8631]

measure while the power is off it hart to tells the parts they tied it together it make you go nuts if you thing that’s parts is the problem you pulled it out checked ok

[@biomedicalelectronicsengin7192]

Thanks

[@eidodoos]

pls mske more video like this

[@biomedicalelectronicsengin7192]

Thanks

[@ubertcoolie8694]

cool video

[@chriswebb4162]

Got there in the end.

[@biomedicalelectronicsengin7192]

Thanks

[@gregjones3660]

Genius

[@jovietapia120]

How match transformer

[@AliRezaJoodi]

Thanks

[@biomedicalelectronicsengin7192]

Welcome

[@RicardoGarcia-oi8hz]

Some guys say that is not okay to test the components within the circuits, some say it is not a problem..... I am really confused

[@biomedicalelectronicsengin7192]

It is more accurate to test the components off the board.

[@eustacehendrix9659]

Electrons will travel through the path of least resistance which is usually the component that you're testing as opposed to going the other way where the resistance of all other components will be added, not to mention there's almost always a diode that will make sure the other way is not a short circuit. Testing on board helps you localize the problem then you take the components out one by one and test off board to double check.

[@RicardoGarcia-oi8hz]

@@eustacehendrix9659 Nice explanation , thanks!

[@sirjothtv4768]

​@@eustacehendrix9659the diode then makes the fluctuation of the 120k resistor which is busted

[@jimle22]

I checked and tested rectifier bridge in circuit and got bad reading. No double voltage from neg to pos. Took it out and it tested good.

[@GrahamLeach]

fix your sound levels

[@arulsubramaniam7648]

10q for tutorial

[@biomedicalelectronicsengin7192]

Thanks

[@tanfor510]

Galing mo brod

[@NelsonTumamak]

Bkt nakareverse pa sa pagtest ng resistor...ayusin mo birada...

[@mikeatlanta9306]

🔥🔥🔥🔥

[@bennavarro3076]

Hello! Bro saan ka sa Saudi nagtrabaho? Hanggang ngayon ba?

[@biomedicalelectronicsengin7192]

Yep....jeddah