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

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Күн бұрын

12 Volt SMPS Power Supply Has Only 3 Volt Output. in this video number {782} i demonstrated and explained how to repair TL494 / KA7500 based half bridge 12 volt 20 ampere smps rafeed model RF-0076, it was providing low output voltage than the rated 12 volt, and there was no control by voltage adjustment potentiometer. i found the pwm controller ic tl494, it was damaged. i replaced the smps controller ic with new one and the power supply started functioning normally
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how to fixed switch mode power supply SMPS step by step when OutPut Voltage Low
How To Repair Switch Mode Power Supply when the output voltage are less than the rated voltage and it is giving unregulated voltage
How To Repair Switch Mode Power Supply SMPS, When it have low OutPut Voltage
how to repair tl494 half bridge topology power supply circuit,
practical repair of 12 volt 20 amp switch mode power supply SMPS.
after watching this video you can capable to:-
how to repair smps
if SMPS have low output or output voltage unregulated
how to repair computer power supply
how to repair laptop charger
#smps #low #output
i shared very easy & step by step practical troubleshooting / circuit tracing and fault finding techniques to find the faults in any switching mode power supply.
how to repair smps (switch /switching mode power supply), either it is industrial power supply, laptop charger, adapter, computer atx power supply, server power supply, mobile charger, battery charger, inverter welding machine, led / lcd tv power supply, power supply of dth / digital satellite receiver,
how to repair smps (switch / switching mode power supplies) in very easy step by step repair and practical troubleshooting & circuit tracing tutorial
12 Volt Power Supply Have Only 3 Volt Output, how to repair smps, switch mode power supply, very easy repair of SMPS, haseeb electronics, smps output fluctuating, SMPS OutPut Voltage Low, smps repair, smps low output voltage problem, smps repair step by step, switching power supply repair, 12 volt power supply, 12 volt 20 amp power supply, 12 volt 20 amp smps, tl494 smps, tl494 smps circuit, tl494 smps power supply, pwm tl494 smps, smps have 3 volt
00:00 12 volt smps power supply is giving low output voltage
00:30 how to apply power to a circuit for testing (DUT / UUT)
00:49 how to troubleshoot / repair smps power supply
04:47 damaged / cracked TL494 ic
05:07 how to check TL494 power supply circuit

Пікірлер: 253

@electroniquepassion Жыл бұрын

good repair 👍👏👋

@HaseebElectronics Жыл бұрын

best regards dear friend

@German_byte Жыл бұрын

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.

@KylaJay243 Жыл бұрын

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....

@gordonlovett71 Жыл бұрын

You da man, keep the videos coming. Very educational

@W1RMD Жыл бұрын

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 Жыл бұрын

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

@ig_jr4843 Жыл бұрын

Thank you !!! Best wishes from Brazil 👏👏

@HaseebElectronics Жыл бұрын

best regards 💕

@tonyrebeiro Жыл бұрын

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 Жыл бұрын

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 Жыл бұрын

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

@sadunnakipoglu9471 2 ай бұрын

Thank you !!! Best wishes from Turkey

@HaseebElectronics 2 ай бұрын

most welcome

@Simon-mz7sf Жыл бұрын

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 Жыл бұрын

best regards and special thanks

@gmtoolman67 Жыл бұрын

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

@jluke6861 Жыл бұрын

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 Жыл бұрын

thanks a lot stay blessed

@jamespaterson7597 8 ай бұрын

very interesting haseeb thankyou

@rectify2003 11 ай бұрын

Well done again 👍

@mrelectromaniac6886 2 ай бұрын

Thanks.you explain very good.

@santosnecesario1932 6 ай бұрын

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

@HaseebElectronics 6 ай бұрын

most welcome and special thanks

@hichamtassi1753 Жыл бұрын

Very nice repair video !!

@HaseebElectronics Жыл бұрын

best regards and special thanks

@Edmorbus Жыл бұрын

Another excellent repair

@HaseebElectronics Жыл бұрын

it is my pleasure

@rul1175 Жыл бұрын

I really enjoy your videos. Thank you.

@HaseebElectronics Жыл бұрын

So nice of you

@aasaan_islam Жыл бұрын

Very nicely explained and demonstrated

@HaseebElectronics Жыл бұрын

best regards and special thanks

@mansirrabiu7412 Жыл бұрын

Jazakallahu khairan Bhai 🙏

@HaseebElectronics Жыл бұрын

best regards

@NikkisKitchenandVlog Жыл бұрын

Very informative thank u so much👌🏼

@HaseebElectronics Жыл бұрын

it is my pleasure

@hunti123 Жыл бұрын

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!

@mohammad45h Жыл бұрын

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

@imranmehdi111 Жыл бұрын

Very helpful video. Thanks for this video sir jee

@HaseebElectronics Жыл бұрын

best regards and special thanks

@aqeelmajeed2759 Жыл бұрын

amazing my favorite teacher.

@HaseebElectronics Жыл бұрын

best regards

@jalal76 Жыл бұрын

Good job.....thanks 👍

@HaseebElectronics Жыл бұрын

best regards 💕

@NEKOTAROU-xj8jw Жыл бұрын

Nice to meet you, my name is NEKO🐱TAROU, a Japanese KZfaqr. 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 Жыл бұрын

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

@adiseshukumpati24 Жыл бұрын

really enjoyed sir soldering/desoldering technique is useful

@HaseebElectronics Жыл бұрын

best regards and special thanks

@mtrltoolman Жыл бұрын

جزاك الله خير

@HaseebElectronics Жыл бұрын

االله يسلمك و يسعدك

@gauripartapshanker9197 Жыл бұрын

Informative vedeo thank u so much.

@HaseebElectronics Жыл бұрын

it is my pleasure

@vijayakumarkumar9190 Жыл бұрын

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

@HaseebElectronics Жыл бұрын

it is my pleasure

@williamsullivan9323 Жыл бұрын

great tip on soldering IC's

@HaseebElectronics Жыл бұрын

it is my pleasure

@platinumsteel6458 Жыл бұрын

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.

@rabihnasr7228 Жыл бұрын

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

@HaseebElectronics Жыл бұрын

yes brother everyday we have to learn something new

@cosmomcfarlane7697 8 ай бұрын

Great love it

@palwindersandhu2031 Жыл бұрын

Thanks a lot........👏👍

@HaseebElectronics Жыл бұрын

best regards and special thanks

@heshamkatr2128 Жыл бұрын

Thx so much

@RotacRepair Жыл бұрын

Sir, thank you for the IC soldering sequence tip.

@HaseebElectronics Жыл бұрын

it is my pleasure

@AliRezaJoodi Жыл бұрын

Hi Very Nice Thanks

@francomongillo 3 ай бұрын

Bravissimo.

@Somanathan-hj7ge 9 ай бұрын

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 9 ай бұрын

best regards

@anantalalsarkar3323 3 ай бұрын

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 3 ай бұрын

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

@xhonatankurti8515 11 ай бұрын

Mashalla, thanks for the videos

@HaseebElectronics 11 ай бұрын

best regards 💕

@CinematicTouchProductions Жыл бұрын

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!

@demontagemontage Ай бұрын

اشكرك

@boopathinarasimman1348 5 ай бұрын

Very nice, 🌹thanks

@HaseebElectronics 5 ай бұрын

Welcome 😊

@dickschottky9406 7 ай бұрын

Thanks!

@HaseebElectronics 7 ай бұрын

Thanks a lot for your valuable support 💕

@kayulasalimu9180 Жыл бұрын

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

@AbdulMomenZargar60 Жыл бұрын

Salaam Bhai Sahib

@HaseebElectronics Жыл бұрын

wa alaikum salaam bhai Ji

@abbaselekberov9033 Жыл бұрын

Hello 👍👍 thanks you, good man

@HaseebElectronics Жыл бұрын

best regards

@snhongo1 Жыл бұрын

Great video

@HaseebElectronics Жыл бұрын

it is my pleasure

@user-qh5kb7rv7o Жыл бұрын

I did enjoy the video

@HaseebElectronics Жыл бұрын

thanks a lot

@pravinpadhiyar2 Жыл бұрын

Vary very nice video sir

@HaseebElectronics Жыл бұрын

thanks a lot brother

@toomatomic793 4 ай бұрын

Hvala za prijevod

@HaseebElectronics 4 ай бұрын

zadovoljstvo mi je. ugodan dan

@hojjatzare2483 Жыл бұрын

that was perfect❤❤

@HaseebElectronics Жыл бұрын

thanks a lot

@AbdulMomenZargar60 Жыл бұрын

Beautiful Video Big Thumbs Up # 532

@HaseebElectronics Жыл бұрын

best regards and special thanks

@BabarAli-qi9yo 9 ай бұрын

Masha Allah

@ahoorapersia4698 Жыл бұрын

Well done 👏✔👍👌

@HaseebElectronics Жыл бұрын

best regards

@abdelilahelazhari1820 Жыл бұрын

Thanks sir.

@HaseebElectronics Жыл бұрын

best regards and special thanks

@anasory3225 Жыл бұрын

Very good sir

@HaseebElectronics Жыл бұрын

it is my pleasure

@aminkhanone7627 Жыл бұрын

Amazing sir

@HaseebElectronics Жыл бұрын

most welcome

@johnmac2680 Жыл бұрын

Very impressive

@HaseebElectronics Жыл бұрын

best regards

@HarlavanisPanagiotis Жыл бұрын

Wonderful video dear friend, have a happy Thursday ☺️

@HaseebElectronics Жыл бұрын

best regards and stay blessed

@vijayakarekar Жыл бұрын

Very nice....

@HaseebElectronics Жыл бұрын

best regards

@Amirkhan-lf6mc Ай бұрын

Great ❤❤❤

@nishanbamunuarachchi6597 8 ай бұрын

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 ?

@abulkalam4440 Жыл бұрын

Thanks.

@HaseebElectronics Жыл бұрын

best regards

@electronicshelpcare 11 ай бұрын

Good

@kuhanthamuthukumarana1158 Жыл бұрын

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 Жыл бұрын

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

@ihyaululum2417 5 ай бұрын

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.

@restorationtv168 11 ай бұрын

Good share❤❤❤

@HaseebElectronics 11 ай бұрын

best regards

@rashidm9396 Жыл бұрын

MashAllah great

@HaseebElectronics Жыл бұрын

الحمد للہ

@julianhilaire1762 Жыл бұрын

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

@HYTMUAE Жыл бұрын

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

@HaseebElectronics Жыл бұрын

best regards and special thanks

@ranamanwarurdupoetry8990 Жыл бұрын

Nice sharing

@HaseebElectronics Жыл бұрын

thanks a lot

@shefqetkaralliu6816 Жыл бұрын

Grazie 🙏⭐⭐⭐⭐⭐👍

@HaseebElectronics Жыл бұрын

best regards 💕

@HarvinderSingh-vs2yl 10 ай бұрын

Tadh desoldering pump bhout asha lagya

@GoutamDAS-ls1wb Жыл бұрын

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 Жыл бұрын

Not that is reliable.

@milanmakwana3883 Жыл бұрын

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

@aliemlek Жыл бұрын

👍👍👌👌

@richardphillips2405 6 ай бұрын

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.

@manoftheday1 Жыл бұрын

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

@nayanjagirdar8408 Жыл бұрын

👌👌👌👍

@HaseebElectronics Жыл бұрын

best regards

@Tsjoetenbille Жыл бұрын

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 Жыл бұрын

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

@bisfal Жыл бұрын

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 Жыл бұрын

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

@bisfal Жыл бұрын

@@HaseebElectronics thank you very much.

@velialici7980 Жыл бұрын

Selâmün Aleyküm Çok güzel ,bazı videolarından istifade ettim, Teşekkür ederim. Senin yaptığın bu işleri Türkçe konuşan biri yapsa daha çok şey öğrenebilirdim. Maalesef ben Türkçe dışında başka bir dil de bilmiyorum. Alt yazı seçeneği ile değerlendirip biraz daha anlamaya çalışıyorum.

@HelgiThorisson Жыл бұрын

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

@HaseebElectronics Жыл бұрын

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

@nishanbamunuarachchi6597 8 ай бұрын

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

@green_life7 Жыл бұрын

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?

@hichamtassi1753 Жыл бұрын

Can you please explain how current control works ?

@siavasharash5448 Жыл бұрын

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 Жыл бұрын

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

@erkanmaller9695 Жыл бұрын

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

@HaseebElectronics Жыл бұрын

most welcome

@somuduttamudi6384 Жыл бұрын

Guruji very nicely explained 💯❤️❤️❤️❤️🙏🙏🙏🙏

@HaseebElectronics Жыл бұрын

best regards 💕

@sunelectronics5102 Жыл бұрын

❤ احسنت

@HaseebElectronics Жыл бұрын

best regards

@AliRezaJoodi Жыл бұрын

Do we use of a IC socket for the TL494 ?

@gopalarao8578 Жыл бұрын

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

@HaseebElectronics Жыл бұрын

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

@gopalarao8578 Жыл бұрын

@@HaseebElectronics Thank you for your reply 🙏

@tvbox8478 Жыл бұрын

👍

@HaseebElectronics Жыл бұрын

best regards 💕

@1fertube Жыл бұрын

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

@HaseebElectronics Жыл бұрын

it is technical alcohol isopropyl alcohol or methylated spirit

@SuperMoha86 Жыл бұрын

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 Жыл бұрын

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

@HaseebElectronics Жыл бұрын

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

@HaseebElectronics Жыл бұрын

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

@czirkosl Жыл бұрын

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.

@Prem_infogate Жыл бұрын

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?