{782} 12 Volt SMPS Has Only 3 Volt Output, Low Output

[@electroniquepassion]

good repair 👍👏👋

[@HaseebElectronics]

best regards dear friend

[@tonyrebeiro]

Just one small observation about your logic regarding the soldering of random legs of the IC. Your logic and technical aspect is fine but all these mass produced cards are usually, Wave Soldered in the factory, which means all the legs of the IC are soldered at one go. From what I know, standard quality electronic components are designed to withstand this heat, without getting damaged. Otherwise, your videos are very informative and useful. Thank you.

[@HaseebElectronics]

absolutely perfect dear at factory the soldering temperature and soldering time are predefined and set properly, either for manual soldering or automatic soldering but in the field there is no temperature controlled seldering iron and not too expert soldering person even in my department my subordinate engineers and technicians most of time damage ics by unconcontrolled temperature soldering iron and soldering time, and in line soldering so in my experience it is best idea to solder or desolder randomly

[@HaseebElectronics]

please accept my best regards and special thanks for your kind observation

[@KylaJay243]

Hi Sir, thank you for sharing your knowledge and skills about electronics troubleshooting and repairing, many people who are interested in electronics like me have learned from your videos. I learned a lot from your tutorial videos. In fact I really understood very well how a SMPS woks. Keep up the good work and looking forward to the next tutorial video. More power to you sir. Mabuhay....

[@German_byte]

I did enjoy the video. I like how you start off with a careful visual inspection of the components and then zero in on the likely culprits. A very satisfying repair.

[@W1RMD]

Great video! The old IC you pulled out looked counterfeit. The shape of Texas was more fat and round and the "I" was not clear. The new one that you installed had a definite clear shape of Texas with a definitive letter "I". Thanks for sharing sir!

[@HaseebElectronics]

best regards most of time the ics have logos but these are not real as most of the components are being manufactured in china, so brand and quality cannot be certified just part number is printed

[@NEKOTAROU-xj8jw]

Nice to meet you, my name is NEKO🐱TAROU, a Japanese KZbinr. I have the same PSU as you. When it breaks down, I will watch your video and try to fix it. Thank you for sharing the video. 👍 I subscribed to your channel. ❗

[@HaseebElectronics]

most welcome try to troubleshoot and if you find some difficulty. please let me know. i will try my best to sort out the problem wishing you best of luck and success

[@jluke6861]

You explain things so good. And you are good at what you do. Thank you for taking time and making this video. Tbark Allah 3alik.

[@HaseebElectronics]

thanks a lot stay blessed

[@Simon-mz7sf]

Gday great presentation. Liked how you made sure other components were in good shape before replacing the IC. I always learn something from you.

[@HaseebElectronics]

best regards and special thanks

[@gordonlovett71]

You da man, keep the videos coming. Very educational

[@santosnecesario1932]

I love watching your tutorial video, very helpful. Explanation is very clear. Thank you Sir!

[@HaseebElectronics]

most welcome and special thanks

[@ig_jr_Area52]

Thank you !!! Best wishes from Brazil 👏👏

[@HaseebElectronics]

best regards 💕

[@sadunnakipoglu9471]

Thank you !!! Best wishes from Turkey

[@HaseebElectronics]

most welcome

[@platinumsteel6458]

Hi i love every single video you have produced. Always learn something new. But i am missing something is it possible you can show us how to verify and check components like the rectifiers, small round capacitors, and transistors in and out of circuit. maybe resistors as well.And show us what a good reading should be and what is a bad reading is thanks.

[@Somanathan-hj7ge]

Sir, perfect working in all respects.more over cleaning, very best, and checked each and every transistor, ic , capacitor etc,super job done.thorurouly repaired sir, the best, good 👍

[@HaseebElectronics]

best regards

[@anantalalsarkar3323]

My dear Brother, I am now only 68yrs! Electronics is my hobby and for passing my liesure period! I fond of watching yours knowledgeable and informative videos like this in You Tube ! May.i expect a little but important help from you? I tried to make a transformer less circuit for 12volt to run a cooling fan (3"12v) with that ? But I have failed! Out put is coming 13.2volt DC ? But while I connect to load the volt shows 4.3 or less! resulting fan is moving very slow! I can't understand what is fault are there ! May be for low ampere or any other reason? I wd like to let you know there are no sufficient room to fix the SD transformer. Kindly help me to give a fruitful suggestion in this regard? I shall be highly grateful to you. My heartiest good wishes for all of your upcoming videos as well as your present video. Stay happy and good bye for the day. I will be awaiting for your reply.

[@HaseebElectronics]

Good afternoon sir. when you are using 3" 12V fan, it means it is DC fan. it needs more ameres and the transformerless power supply (volatge dropper circuit) can provide just in milliampers, that is causing to drop the volatge to 4.3 volt. it is better to use isolated transfomre based power supply having a safe limit for current capacity please accept my best regards

[@kuhanthamuthukumarana1158]

Very Interesting ,,,,,,, Good Teacher......Easy to understand.........Dear Sir ....What is best Bulb wattage for use series to power up MPCS to check....I mean 100w or 40W

[@HaseebElectronics]

best regards 50watt tungsten lamp is awesome for power supplies upto 100 watt. 60/100 watt lamp will good for 100-200 watt power supplies

[@vijayakumarkumar9190]

Very good and useful information sir thanks for sharing this knowledge to us

[@HaseebElectronics]

it is my pleasure

[@aasaan_islam]

Very nicely explained and demonstrated

[@HaseebElectronics]

best regards and special thanks

[@gmtoolman67]

Hello sir , I love to watch and relearn from your vdos , your tip to desolder ICs in random order reminded me of my service instructor who use to reiterate the same thing and i used to repeat to my students .... Best regards

[@CinematicTouchProductions]

Hello Mr Haseeb, my youtube teacher. I can watch your videos for hours and not tire, I have a question for you. Do you have a video that can teach us your youtube students how to follow traces from point to point from the various components on a PCB on different types of electronics, or can you make a video for us please, I am trying to learn but I get lost looking at all the lines and most times it is a bit frustrating for a beginner like me because I really want to understand where these traces from each component begin and end and I get lost, thank you teacher for being so professional in the way you teach us!

[@HelgiThorisson]

Very good video. How warm are your soldering irons in this video?

[@HaseebElectronics]

i use soldering iron at 380-410 degree centigrade desoldering tool 420-440 degree centigrade

[@GoutamDAS-ls1wb]

Haseeb, excellent video with great advice on how to desolder IC's. I was wondering why you needed to take the heat sinks off to do the testing??? Is there a way to test the transistors without desoldering them?

[@MichaelKingsfordGray]

Not that is reliable.

[@RotacRepair]

Sir, thank you for the IC soldering sequence tip.

[@HaseebElectronics]

it is my pleasure

[@bisfal]

Hi sir. Thanks for the videos. I don't understand how a bad ic tl494 can have its vcc input lowered. I thought the vcc will not affected.

[@HaseebElectronics]

best regards i think its internal regulator is damaged, which caused to pull down the vcc pin. so ic cannot start working

[@bisfal]

@@HaseebElectronics thank you very much.

[@Edmorbus]

Another excellent repair

[@HaseebElectronics]

it is my pleasure

[@mohammad45h]

تشکر وسپاس جناب مهندس ممنون وهزاران لایک.....لطفا وحتما راجعب پمپ...و.. وکیوم وهویه مکنده لحیم وات ان توضیح دهید ممنونم..🙏🙏👌👌❤❤

[@NikkisKitchenandVlog]

Very informative thank u so much👌🏼

[@HaseebElectronics]

it is my pleasure

[@1fertube]

Great! What liquid do you use to clean the board with the toothbrush? Thanks

[@HaseebElectronics]

it is technical alcohol isopropyl alcohol or methylated spirit

[@Tsjoetenbille]

Hi Sir. Another excellent repair. Is there any reason for the soldering sequence of the IC? Is it better to solder pins opposite than side by side for overheating? Kind regards, Frederic.

[@HaseebElectronics]

it is best way to divide ic pins in four portions for example i have 16 pin ic first i will solder pin 1, then 5, then 9 and 13 then 2, 6, 10 & 14 then 3, 7, 10 & 15 at ast 4, 8, 12 & 16 so using this technique every last pin will get adequate cooling time

[@adiseshukumpati24]

really enjoyed sir soldering/desoldering technique is useful

[@HaseebElectronics]

best regards and special thanks

[@williamsullivan9323]

great tip on soldering IC's

[@HaseebElectronics]

it is my pleasure

[@hichamtassi1753]

Very nice repair video !!

[@HaseebElectronics]

best regards and special thanks

[@demontagemontage]

اشكرك

[@HarlavanisPanagiotis]

Wonderful video dear friend, have a happy Thursday ☺️

[@HaseebElectronics]

best regards and stay blessed

[@mansirrabiu7412]

Jazakallahu khairan Bhai 🙏

[@HaseebElectronics]

best regards

[@green_life7]

I want to use smps for my garden lighting supply instead of AC for safety reasons. Will it be a good idea? I will run many 12v DC led bulbs. Also please tell why SMPS have many output connections? Should I club all connections into 1 set of 12v DC? Also please tell is there any chance that a SMPS gives AC output and give shock to anyone in the garden? If there is a chance, what to do? Should I use a fuse to avoid any mis-happening or is there any other method such as MCB? If yes, what should be the specifications of the fuse/mcb or other component?

[@rabihnasr7228]

Woow before you disassemble it i was thinking that the feedback is in problem thank you

[@HaseebElectronics]

yes brother everyday we have to learn something new

[@richardphillips2405]

Thank you for your video. I looked up the TL494 IC chip. I realized that I did not understand it's operation. Is it possible to trouble shoot a circuit like a power supply without totally understanding the operation of the circuit, but able to understand the basics of the circuit operation. For example, I know that the TL494 is the regulator IC. The crack on the TL494 would make you suspect that it is bad. I understand SMPS basics, but I don't totally understand the circuit operation. So, I consider this a learning challenge to understand how all of this works. If someone wanted me to fix a power supply. I probably would spend more time trying to understand how the circuit works than actually spending time on trouble shooting the circuit. Could you suggest any books or material that goes into the circuit operation of power supplies. Thank you again.

[@imranmehdi111]

Very helpful video. Thanks for this video sir jee

[@HaseebElectronics]

best regards and special thanks

[@jalal76]

Good job.....thanks 👍

[@HaseebElectronics]

best regards 💕

[@nishanbamunuarachchi6597]

I really appreciate your very detailed and accurate explanation. Many thanks dear . Can we check the vcc voltage without the ic ( before replacing the new ic) pls ?

[@julianhilaire1762]

Hi Haseeb Can you make a video on the functions of an led/lcd tv t-icon board and how it function. Thanks on advance

[@AbdulMomenZargar60]

Salaam Bhai Sahib

[@HaseebElectronics]

wa alaikum salaam bhai Ji

[@Ahamed-iz2sc]

hi bro salaam, what are the components to buy for starting psu repair

[@mrelectromaniac6886]

Thanks.you explain very good.

[@SuperMoha86]

Thank you Haseeb for the great explanation as usual, how can i get the soldering iron tool like yours in this video? and also how can i get the schematic diagram for any smps?

[@HaseebElectronics]

best regards it is WELLER WR3M made in Germany, you can purchase it online

[@HaseebElectronics]

drive.google.com/file/d/1_gw2TujAWDSzaWYBIpBEOreGime8hKCv/view?usp=share_link

[@HaseebElectronics]

drive.google.com/drive/folders/1TlHNmTDtY2NvDAg1XQUkMQFXhpG3aLuV?usp=share_link

[@rul1175]

I really enjoy your videos. Thank you.

[@HaseebElectronics]

So nice of you

[@jamespaterson7597]

very interesting haseeb thankyou

[@AbdulMomenZargar60]

Beautiful Video Big Thumbs Up # 532

[@HaseebElectronics]

best regards and special thanks

[@toomatomic793]

Hvala za prijevod

[@HaseebElectronics]

zadovoljstvo mi je. ugodan dan

[@gopalarao8578]

Hi sir...namaskaar. I like your working style. Which liquid is using to clean the pcb..? Thank you for the video. Good night 🙏

[@HaseebElectronics]

best regards and special thanks it is isopropyl alcohol technical alcohol or methylated spirit

[@gopalarao8578]

@@HaseebElectronics Thank you for your reply 🙏

[@gauripartapshanker9197]

Informative vedeo thank u so much.

[@HaseebElectronics]

it is my pleasure

[@siavasharash5448]

Was a wear problem of tl494 Because it was oscillating and you got some dc voltages on output. Also you got voltage near 5 volt in 5 volt referance pin So If that crack was not exsist the ic would be the last component you suspect to damage

[@HaseebElectronics]

no it was TL494 failure initial low voltage are being provided from start up circuit, it is composed of using mosfet gate biasing circuit + pulse transformer secondary side. this start up circuit, operates the mosfets in conduction state, which cause a limited current in mosfets and the transformer, in result the limited current causes to produce low voltage, and also it provides vcc voltage to SMPS controller, and it can start IC, then ic will start to produce rated output and it starts voltage regulation

[@rectify2003]

Well done again 👍

[@aqeelmajeed2759]

amazing my favorite teacher.

[@HaseebElectronics]

best regards

[@mtrltoolman]

جزاك الله خير

[@HaseebElectronics]

االله يسلمك و يسعدك

[@HYTMUAE]

I watched most of ur videos .. ur explanation is amazing .. I wish you were my teacher at the University 😁

[@HaseebElectronics]

best regards and special thanks

[@kayulasalimu9180]

You are good.would like you to so sort out more on inverter problems.

[@boopathinarasimman1348]

Very nice, 🌹thanks

[@HaseebElectronics]

Welcome 😊

[@electronicshelpcare]

Good

[@hunti123]

Thank you, i have a very similar SMPS but instead of TL494 it has KA7500BD, but i had the same voltage and the same problem. Thanks!

[@nafez3945]

Hello After repairing this type, I noticed that there was a voltage value on the body of the charger that reached 100 volts, when placing the avometer sensors between one of the electrical inputs and the body of the charger. Is there any clarification because I noticed this using my initial electric screwdriver, which gave strong lighting Note dear sir The board and all elements are completely isolated, the sequence lamp does not work, and the device works well after replacing the 13007 transistors

[@HaseebElectronics]

please check this video and reply the results kzbin.info/www/bejne/bJSaiXZ4frmNetE

[@palwindersandhu2031]

Thanks a lot........👏👍

[@HaseebElectronics]

best regards and special thanks

[@pravinpadhiyar2]

Vary very nice video sir

[@HaseebElectronics]

thanks a lot brother

[@ihyaululum2417]

I have the same problem, but mine is a computer power supply. thank you for the tricks given, maybe I also need to replace the pwm IC.

[@nishanbamunuarachchi6597]

Also do we get equal base bias voltage to the main 2 transistors in the start up section when there is no load ? pls clarify . Thanks

[@hichamtassi1753]

Can you please explain how current control works ?

[@milanmakwana3883]

dear i am watch your video nicely explanation please let me know how aux supply of Control IC is getting

[@anasory3225]

Very good sir

[@HaseebElectronics]

it is my pleasure

[@snhongo1]

Great video

[@HaseebElectronics]

it is my pleasure

[@heshamkatr2128]

Thx so much

[@خالدباشميل-ب9و]

I did enjoy the video

[@HaseebElectronics]

thanks a lot

[@manoftheday1]

Good day sir , please can you do a video on how to calculate the output inductor of power supply using tl494 please.

[@eamonhannon1103]

What did the IC fail ?. The Ic seemed to be cracked and there was discolouration near one pin . This suggested the IC suffered some catastrophic event causing the failure . But no other fault was found , which leaves the question what caused the catastrophic failure of the IC ?

[@HaseebElectronics]

material failure is possible in electronics. as its seems that its reference regulator circuit got problem which caused to chip substrate damage. it is also strange for me that vcc section is normal, and output side of refrence circuit is good as these 5 vlt reference are being used for chip biasing, internal flip-flops, comparators biasing, any internal failure may be a reason of its failure

[@aminkhanone7627]

Amazing sir

[@HaseebElectronics]

most welcome

[@johnmac2680]

Very impressive

[@HaseebElectronics]

best regards

[@eyad.alnoun]

Thank you my friend, do you have a diagram for this type of power source, because I need some resistor values

[@HaseebElectronics]

kindly check this diagram. might be it may help bit.ly/3y9RJ4g

[@eyad.alnoun]

@@HaseebElectronics Thank you, dear brother. Is this diagram for this particular model, or is there a difference because I will rely on it to read the resistor numbers and replace them with the same value?

[@muhammadfarooq9482]

Very good teaching Sir ek Tdk sws 75-24 power supply k out put ma 24 k bajay 5v atay hain aur VR no effect and voltage decreases gradually 24 to 5v kindly what is the fault please

[@abdelilahelazhari1820]

Thanks sir.

[@HaseebElectronics]

best regards and special thanks

[@AliRezaJoodi]

Hi Very Nice Thanks

[@vijayakarekar]

Very nice....

[@HaseebElectronics]

best regards

[@rashidm9396]

MashAllah great

[@HaseebElectronics]

الحمد للہ

[@eamonhannon1103]

The IC was damaged was this a random device failure or was there some operating condition that caused damage to the IC ?

[@HaseebElectronics]

I think it is material failure if it was damaged due to related components then we can say it was due to external cause but in this situation I think it's reference regulator (inside Ic) is damaged

[@swiftsilver]

what makes you choose aneng Q1 multimeter instead of the fluke you used previously?

[@HaseebElectronics]

wow great question I have fluke 179 fluke 115 fluke 77iii aneng Q1 uni-t ut202a+ and tenma but I prefer aneng Q1 as it is cheaper, and better response and accurate results so It attracts me. otherwise there is nothing special behind it's usage

[@kameshg6034]

Hi Mr.Haseeb, my 120W (12v 10A) smps output voltage good but output current very low, i am unable to use 12v 5A load even in smps no voltage fluctuation or down very stable voltage, i checked all components are good in pcb, but low output current, so what is problem & what component to be replace in smps ? waiting your reply

[@francomongillo]

Bravissimo.

[@erkanmaller9695]

👍🇹🇷🇹🇷🇹🇷👍Another great video..! We are waiting for your smps repair videos.. Greetings from TURKEY..

[@HaseebElectronics]

most welcome

[@xhonatankurti8515]

Mashalla, thanks for the videos

[@HaseebElectronics]

best regards 💕

[@Prem_infogate]

I have a quick question. Is that pull the required ampere output such as 20A or 30A or 40A from 230v with a 6A/10A 3 pin? I am using a car amplifier at home which is maximum ampere rated as 35. To get a desired ampere output what should I do?

[@abulkalam4440]

Thanks.

[@HaseebElectronics]

best regards

[@oceanelectricity-dmz204]

Hello Sir! I have a question, how can I change the 5v charger to 12v? If you have time, answer me or show us please!. I saw a video made on KZbin but I don't know the language, it's mostly indie!

[@cosmomcfarlane7697]

Great love it

[@abbaselekberov9033]

Hello 👍👍 thanks you, good man

[@HaseebElectronics]

best regards

[@BabarAli-qi9yo]

Masha Allah

[@marketinggcc]

Is there any video for dual output.. Like 24 0 12v

[@czirkosl]

It's very simple, VR1 voltage regulator trimmer 1 kohm is defective, try to 300 Ohm - 560 Ohm resistor. If I have made a shorcut for trimmer voltage became 13,5 V the output.

[@HarvinderSingh-vs2yl]

Tadh desoldering pump bhout asha lagya

[@raoamarjeet5473]

Nice video Sir Where is this smps used?

[@HaseebElectronics]

it is used in decoration lighting system

[@raoamarjeet5473]

@@HaseebElectronics ok Sir Thank you so much

[@ahoorapersia4698]

Well done 👏✔👍👌

[@HaseebElectronics]

best regards

[@restorationtv168]

Good share❤❤❤

[@HaseebElectronics]

best regards

[@amp.fone.]

Do these supplies have short circuit protection?

[@HaseebElectronics]

no, it don't have short circuit protection. these ics have current limit option only, because it is using TL494/KA7500, and this ic utilize error amplifier number 2 to limit the current,

[@amp.fone.]

@@HaseebElectronics so this is what happened in my font. The pointers came together. Thank you for your attention. Good job.