{824} SMPS Output Is High, Fluctuating and Noise

in this video {824} SMPS Output Is High, Fluctuating and Noise. i demonstrated how to repair a switch mode power supply SMPS model number, S-500-12 it is 12v 40 ampere 500 watt industrial power supply,
problem in this power supply that,
1. output voltage were high than the rated voltage. it was providing above 17 volts instead of 12v.
2. output voltage were fluctuating from 17 volt to 20 volt
3. output unregulated and uncontrolled
4. smps was providing tick tick and humming and whistling sound
i found that in this KA7500 / TL494 based half bridge topology power supply, the signal amplifier transistors for isolating pulse transformer damaged. these we 2SC2655 transistors and i replaced with 2N4923 medium power transistors
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#smps #output #fluctuation
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00:00 how to repair 12V 40A 500watt SMPS
00:16 smps output fluctuating with high unregulated voltage
01:04 smps tick tick humming noise / sound
01:38 smps output is unregulated and uncontrolled

[@razaelectricaltips]

Asslamalkuam frst cmnt..... 🪴🌻Mash Allah Nice sharing information video 🪴🌻

[@HaseebElectronics]

Thanks and welcome

[@ashia9835]

I

[@Solder_it]

I came back here because i have similar issue👍🏻 but with a small smps(charger). Thank you 🌹

[@German_byte]

Another excellent repair. I like the use of the nail clippers to cut the excess off the component leads. 😀

[@HaseebElectronics]

best regards and special thanks yes nail cutter is really useful tool

[@gauripartapshanker9197]

I had over output problem I repair this problem from feedback circuit. I apply the knowledge given by you. Thanks again.

[@HaseebElectronics]

You are welcome yes brother uncontrolled over voltage conditions have many possibilities

[@mahmoodh7767]

Excellent mr haseeb and thanks for sharing knowledge 👌👌👍👍

[@nihatkosova8436]

you are best teacher who is showing on internet since this time. thanks

[@RotacRepair]

Sir, Thank you for sharing your great electronics knowledge and experience in a very understanding way. Thank you for giving me the the greatest gift anyone could give, the gift of knowledge. Many Thanks!

[@rajasekaranthangaiyah5547]

Thank you ,Sir

[@temyraverdana6421]

Another great lesson and amazing work. Thanks

[@HaseebElectronics]

best regards

[@ministeriomundialliberando8403]

with your videos we're always learning. Thaks.

[@channelsixtysix066]

Enjoy watching your videos, Haseeb. Thank you.

[@electronicshelpcare]

Good brother

[@kaizen1071]

Tamir videosu izlemek daha zevkli.Ama burada olan hassas bilgiler başka başka bir yerde yok. Sayğı ve selamlar.Güzel ve değerli insan.

[@Yorumcu63]

8.dakikadaki transistör testinde da arızaı olduğunu nasıl anladı o kısmı anladınızmı siz?

[@kaizen1071]

@@Yorumcu63 Selam kardeşim. 2 adet 2sc2655 anahtarlama npn transistör 1 ucunda diyot değeri var. Diğer uç açık devredir. Açık devre olması nedeniyle görevini yapamaz. Bozulmuş.Sağlıklı günler dilerim.

[@Yorumcu63]

@@kaizen1071 Çok tesekkürler .

[@ELHADJIRA]

thanks haseeb for all videos from algeria 👍

[@HaseebElectronics]

best regards

[@mtrltoolman]

I like it. Every video of yours i learn a thing. Thanks.

[@HaseebElectronics]

You are welcome!

[@skecmrepairandcars2590]

Mashaallah nice explanation sir

[@HaseebElectronics]

best regards and special thanks

[@mbashir42]

Excellent Very Nice method of explaining

[@gauripartapshanker9197]

Knowledgeable and informative vedeo. Thank u so much . God bless you.

[@HaseebElectronics]

Thanks and welcome

[@amianantech6298]

Great teacher

[@W1RMD]

I've seen on Mr. Carlson's Lab where you can take those apart. It's been a while since I've seen it, but worth watching. May not be worth taking apart though since fans are so cheap. I think the one he took apart was just dirty. If bearings are bad it might not be worth it either. Take care.

[@Versatiledani]

Excellent work thanks for sharing dear brother

[@islamraouf1856]

Appreciate all you efforts sir.

[@HaseebElectronics]

best regards

[@rmjnm]

I injoyed this video.

[@HaseebElectronics]

best regards

[@Devil_inside-]

The absolute right way to work..sir..

[@HaseebElectronics]

thanks a lot dear brother

[@akierum]

Good job

[@muhammadishtiaq24]

Excellent thanks for sharing

[@HaseebElectronics]

thanks a lot

[@user-ry8pu9bo5q]

سلام مهندس عالی خسته نباشی محسن ایران...

[@rolanddejesus8685]

thanks very much again sir for sharing your knowledge...God bless.

[@HaseebElectronics]

thanks a lot for your valuable words

[@saarike]

Interesting failure and great vid!!! My humble thanks 👍👍

[@HaseebElectronics]

yes dear brother it is really awesome

[@TABE-O]

excellent repair video.

[@user-hh6gg1vu7q]

Very good 👍👍

[@HaseebElectronics]

Thank you very much

[@Solder_it]

Thank you Sir

[@HaseebElectronics]

Most welcome

[@kmhovlog6185]

Like mashallah excellent 👌 informative vedio thanks for sharing

[@HaseebElectronics]

best regards

[@shefqetkaralliu6816]

🙏Grazie 🤩

[@vijayakumarkumar9190]

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

[@HaseebElectronics]

Most welcome

[@palwindersandhu2031]

Thanks for sharing sir regards

[@HaseebElectronics]

Most welcome

[@AURELIOMOREIRAam1960]

Parabéns muito bom !

[@HaseebElectronics]

atenciosamente. saudações

[@AbdulMomenZargar60]

Good Morning & Best Wishes Like This Good Video

[@HaseebElectronics]

best regards and special thanks bhai

[@idealsolution4468]

Assalam alikum sir Great video and great information Sir ak UPS ke circuit pr video bnain jis man us ke har parts or function kase kam krta hai ic ka kia functions hai details se btain please regards Amir

[@K2DO]

Exillent, I think bad fan was the main reason for the transistors to fail due to overheating

[@vijayakarekar]

Thanks....sir ji

[@HaseebElectronics]

it is my pleasure

[@neduodumbu1969]

Nice tutorial video sir. Please, what type of desoldering pump did you use in removing those amplifier transistors?

[@robeltsegaye1505]

Hi sir its good to teach us new things about electronics could u show us how to wind wash machine washing motor and spin motor does the have difference

[@rashidm9396]

MashAllah great

[@HaseebElectronics]

best regards

[@tvbox8478]

👍

[@kwchoi5272]

Hello! Thank you for the video! What is the standard to replace transistor 2SC2655 with 2N4923? Thank you!

[@vadimm6432]

Great video, thank you! Please use an extraction fan, your grand children will thank you ❤️

[@W1RMD]

What is that?

[@vadimm6432]

@@W1RMD like a fan with a charcoal filter on it, to extract the smoke during soldering. Those fumes are bad to inhale, especially when you do this all day long.

[@W1RMD]

@@vadimm6432 Oh, Okay. Haseeb did a solder safety video on this about a year ago.

[@HaseebElectronics]

i am really thankful for your valuable point of personal safety. we must take take for personal and equipment safety all the time. specially personal safety is most important and it must be at top priority all the time

[@idk2412]

Thank you for the video! How do you have the light hooked up? What is the purpose?

[@HaseebElectronics]

most welcome are you asking for the series lamp. it is connected in series of line voltage. if there is something wring in the power supply, it will illuminate, and it will damage more

[@idk2412]

@@HaseebElectronics Oh interesting, so it is essentially checking if there are shorts or low impedance paths to neutral or Line (depending where the lamp is inserted)?

[@alanshare1530]

Asaalamualaikum, very nice video. I want to ask about surge arrestor in smd board. Can u explain how to test its ok or not ok?

[@dipakbhalodia7155]

मेरे दोस्त आप English chennal मे जो वीडियो डालते हैं उसी वीडियो ऊर्दू chennal मे काफी बाकी है लास्ट 5 से 6 महीने से देखता हू हमारा भी उर्दू वाले को भी ख्याल रखे नमस्कार

[@mtrltoolman]

Can you please make a video about load test on this power supply and how to calculate the resistive load for any power supply for testing purpose. Jazak Allah Khair .

[@muhammadiftikhar9547]

Assalamualaikum sir, Sir LED universal card pr b video bnain

[@AnilKumar-jv5jz]

🙏🏻🙏🏻🙏🏻🙏🏻

[@HaseebElectronics]

best regards and special thanks

[@herielrizk]

جزاكم الله خيرًا على مشاركة مقاطع فيديو شيقة I will always follow your channel, If I may ask, I have an ATX brand delta electronics that uses a DNA 1001/2 IC, but I'm having trouble finding a point to make the voltage adjustable. Please help

[@Yorumcu63]

Great knowlodge How understand bad transistors in 08:00 measuring ?(Not see multimeter screen ) Could you make a short describe? were they the same values as the test you did after disassembling? Esselamu Aleykum

[@nassim6925]

I have a similar power supply can I replace the npn transistor with an n chanel egbt

[@HateSomeone-yo7jb]

Sir, what is the name of that desoldering tool you used?

[@johnnytheangel1]

just out of interest, is it safe to work on circuits while under limiter and for how long for trouble shooting ?

[@HaseebElectronics]

thanks for your valuable comment yes it is safe to working under limiter. and we can proceed the troubleshooting, because the series lamp allows the safe limit, (if lamp is 60 watt, then the UUT will not receive more than 60 watts, so we can work in safe limits)

[@IMTIYAZAHMAD905]

Sir give information about how you replace transistor (how read parameters)

[@gopalarao8578]

Hi brother namaskaar. Thank you for sharing this video. Wich component is producing humming noise..,when the circuit is faulty. Have a great day 🙏

[@HaseebElectronics]

clicking / humming / whistling sounds are most of the time from transformer, it becomes due to saturation condition of the core. it is due to uncontrolled primary current, it finishes with proper conduction if this sound is available at normal situation, in that time may be primary winding is loose or sometimes core halves become separated,

[@gopalarao8578]

@@HaseebElectronics Thank you for your reply 🙏

[@Muradkhan5058]

I have the same supply 12v40A but burn in18v 23A through booster 1500w module.is this 40A support.

[@ElektroTech84]

Hello, I have a question. As a result of connecting a high current fuse to the power supply of the steam machine I use at home, I changed it because the mosfet, zener diode, ntc and 2 watt resistor on the primary floor failed. I can get 12 and 35 volts on both of the outputs, but when I connect the power board to the motherboard, it shows 12v as 2.5 volts and 35v as 16 volts, so the fan and water evaporator are not working. I also changed the capacitors at the outputs of the power board. What other parts on the power board should I check? thanks

[@elektronikhobim6903]

Akım izleme direncini kontrol et.Anakart istediği akımı alamadığı için çıkış voltajı çöküyor.Bunun içinde anahtarlama mosfetini ve pwm entegresini kontrol et

[@ElektroTech84]

@@elektronikhobim6903 Akım takip direnci dediğiniz, Primer katındaki yüksek whattli dirençler mi

[@ictrepairs6963]

What to blame when the ocp get triggered at very few current absorption (around 150 ma) on a pc smps?All the output except for the 3,3 v line works great and the power supply is almost in new condition.

[@ictrepairs6963]

Could also be the under voltage protection triggering in? The 3,3v rail is supposed to provide at least ten times the current available in this condition. What do you think it could be the real cause of the issue?

[@LanceMcGrew]

So what component was doing the clicking sound before repair?

[@HaseebElectronics]

this clicking sound from the transformer's saturation condition when there is uncontrolled switching, it produces this kind of clicking and humming sounds

[@waldeniya]

Thanks for the valuable video and excellent teaching,I have a problem please help me SMPS,2000w,52v out put(saft PM18R) Fault-Giving 72V output and shutdown PWM Controller-UC2875DWP ,PFC IC-UC2854 ,FULL BRIDGE SYMPTOMS-DC VOLTAGE 420v, Vcc ok and stable, OPTOCOUPLER input 1.1v,output 100mv,changed the optocoupler but doesn’t help,reference voltage 5v Please advise me

[@AURELIOMOREIRAam1960]

Tenho uma fontes oscilando led piscando.fica variando tem todo a voltagem. Obg

[@HaseebElectronics]

LED pisca devido ao capacitor VCC, (perto do controlador smps ic) qualquer componente de curto-circuito no lado secundário por favor verifique o vídeo número 876 para mais detalhes

[@sunny-yj5tb]

How to determine which substitute transistor can be used if we don't have exact part, please make a video on this topic....

[@Yorumcu63]

Merhaba 8.dakikadaki transistör testinde transistörlerin arızalı olduğunu nasıl anladı o kısmı anlatacak arkadaş varmı acaba?( Multimetre görülmüyor) How understand bad transistors in 08:00 measuring ? (Not see multimeter screen ) Could you make a short describe? were they the same values as the test you did after disassembling?

[@HaseebElectronics]

i am sorry for inconvenience. no problem, i will demonstrate again with complete details and test parameters

[@azharfahim3671]

Asslamalekum

[@HaseebElectronics]

best regards

[@ilanbinkovitch6054]

Sometimes you can repair a stuck fan by removing the sticker on the axis , and putting a drop of WD40 inside.

[@xristostri1054]

Hello, i m curious what is wrong when on high voltage capacitor (smps) metering 430 volts instead the usually 330v ? Thank you

[@HaseebElectronics]

when the smps transformer starts ringing, and it's RCD snubber is not functioning it causes to elevate the voltage at bulk capacitor at this situation destroy the capacitor, MOSFET etc

[@HaseebElectronics]

morover if the EMI filter is resonating beyond corner frequency of the filter then that EMI filter also starts ringing or self oscillation which causes to increase the input voltage of bridge rectifier in this scenario, check ac voltage at ac input terminal then compare ac voltage at bridge rectifier input pins if ac input terminal and bridge rectifier input pins have a large difference then the possibility is emi filter

[@lucasrocha4329]

What is the best windows simulator for smps?

[@greshanbandara8007]

My acer "Liteon ps-5221-9ae" computer power supply also have same problem. Series lamp illuminate high speed and after few seconds turn off power supply. it has TN277PN IC and CM6802AHG IC in primary side. stand by voltage ok. TNY277 IC D -S voltage same as Capacitor voltage. mosfet and diode also good. what is the problem here. primary side or secondary side. please help sir

[@jamalzaghal2487]

Salam alaykum, where can I get a circuit diagram for this PSU?

[@bulentbayar6325]

👍👍👍🤲🤲🤲

[@erickguzman9519]

Amigo tengo un problema con esta misma fuente el conector del ventilador tengo 20 voltios pero cuando conecto el ventilador baja a 4.2 voltios y gira muy suave el ventilador gracias de antemano

[@erickguzman9519]

Oye amigo tengo un con esta fuente el ventilador tiene 20 voltios pero cuando lo el ventilador baja 4.2 a 5.4 voltios necesito unos tic que hacer muchas bendiciones.

[@nassim6925]

Why they use an npn rather than a mosfet

[@sudheesht1388]

Sir I have one SMPS and it is 110 and 240 input and 12 voltage DC output. But now it only works with 110 input not working with 240, please help me to solve this type of problem

[@alamgirhossen5089]

After 2 to 3 minutes the fuse is getting wasted of power supply but all part is ok only fuse burn which problem please reply

[@thomasjoyce2814]

Hi why does my series lamp stay on when the power supply is working okay

[@HaseebElectronics]

some power supplies are high rating and some of them have PFC circuit, which consumes the power moreover low wattage rating for the lamp also cause to illuminate it

[@thomasjoyce2814]

Thanks for the reply I appreciate the advice, and your full explanation, for me I am getting to understand electronics.

[@mustafauyar3040]

میں کھلے اجزاء کا پتہ کیسے لگائیں اور کیا غور کیا جانا چاہئے؟

[@callishandy8133]

Nice video ! I like these way you show what you check and ... Well done it works ! Check it with the LED lamps as a load and install the ventilator quick for a permanent cooling before testing (and close the case. When a capacitor explode and it is closed = ok all persons are alive and without foil an fragments in the face + skin) Thumps up : you cleaned our table = yes you are professional or as a amateur learned the hard way what can (and will) happen. Thumps up : you have a weller soldering iron and a sucktion welding iron. Thumps up : nice check (I desolder the big capacitors and check these (short circuit and the capaity value with a special instrument) I hope your very big transistors have a low basis current . the smal worse transitor usally need low current for work. And small transistors have better amplification ratio than the medium ones you used. Buttwell it works. AdditionaI add aluminium cooling sheet metal for the full bridge rectifier. Must be a very cheap brand because no manufacturer name at the sticker. If checkfor the words X2 or Y2 at the RFI capacitor between low voltage and high voltage area. If these are cheap types it is possible when these fail to have ... But well it is usuall in my country and I have used old capacitor in best condition from technical broken devices (and I can buy these in my area for low/medium amount of money if needed). My thumps up for your video. The digital multimeter have a (like all ditial ones) a slow conversion rat at the display. The voltage is jumping ... Sometimes I check these with a (nor cheap) oscilloscope (and a transformer to isolate the scope ground in case of ...) The light bulp in you main power cord is perfect fpr your safty and the circuit.

[@HaseebElectronics]

thanks a lot and special thanks for your valuable comment Check it with the LED lamps as a load. ( *i use resistive load for test* ventilator is really great suggestion. i will arrange it Thumps up : you cleaned our table = *THANKS A LOT* Thumps up : *YES GOOD REWORK TOOLS ARE IMPORTANT FOR BEST RESULTS* Thumps up : *THANKS A LOT* regarding transistors, the medium power transistor is very close to the original transistor yes it is cheap brand with compromised quality i am using this lamp just only for video purpose, otherwise the bench based series lamps are away from the camera range, please accept my best regards