{1154} Crestron SMPS no output

In this video number {1154} Crestron power supply repair, No output solution. I explained how to repair 24 volt 4 ampere crestron electronics inc, rockleigh NJ (New Jersy) model number CNPWSI-75, it is UC3842 based switch mode power supply for Crestron automation control system.
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#crestron #smpsrepair #restoration #electronics

[@osamanassr2645]

I really love this channel keep up the good work, I'm a Mechatronics engineer and I learned from this channel more than I learned from college

[@HaseebElectronics]

welcome dear Engineer.
thanks a lot for writing valuable words for my efforts

[@hichamtassi1753]

Salam Dear Ashraf, always a pleasure to watch your videos. Have a great summer. Greetings from Morocco.

[@nuritepegoz6042]

sn : ustam herzamanki gibi maşallah mükemmelsiniz ellerinize sağlık

[@feeldiben]

Thank you Mister Haseeb for all your time and patience to teach us your great knowledge

[@saarike]

Simply Great!!! Thank you

[@HaseebElectronics]

You are welcome!

[@ISO07ISO]

Seni takdir ediyorum usta hocam👏👏👏

[@fatih81]

Ustalık sergiliyorsunuz değişik cihaz bizleri de öğrenme tamir etme hevesi artıyor seviliyorsunuz takipteyim.

[@rolanddejesus8685]

thank you very much sir...god bless.

[@chuckvoss9344]

thank you for sharing with us.

[@proudlytamilan1401]

Sir nice video ,how to find leaky capacitor, transistor, diode and find good or bad cap non polar cap. Please upload one video

[@محمدالزعبي-ع2د]

ماشاءالله تبارك الرحمن

[@muhammadishtiaq24]

Excellent thanks for sharing❤❤

[@SandraGerez66]

Good video

[@indianbrijmohan8957]

Kuch suply half bridge mode wale me module lagane ki video banaaye Sir🙏🙏

[@Ngage9913]

Good work bro....

[@Rithuservice]

Good job 👍 , which type of solder iron you're using in this video

[@salehneyestani7627]

How u recognize the Ic chip is damaged? When we not have feedback voltage, first we check resistants in feedback rail. But you first go to Ic chip directly

[@HaseebElectronics]

in any SMPS first check point is DC rail,
then VCC capacitor
then output capacitor
then feedback circuit
feedback circuit is the lastest step

[@salehneyestani7627]

​@@HaseebElectronicsI watched it again carefully. I made a mistake. I thinked at first time, you said feedback pin. But in real you said refrence pin. Yes, when refrence pin has no voltage, the IC chip is damage 👍

[@HaseebElectronics]

no problem. right now i recorded a detailed troubleshooting flowchart
i hope it will a good addition

[@tvbox8478]

👍

[@gsatya9732]

Sir my atx power supply all voltage are fluctuating but stand by voltage 5 volt coming. What may the problem?

[@user-vt2dq8cv3f]

Can't you provide external ref voltage if internal is missing ; thank you: Zambia

[@HaseebElectronics]

no we cannot inject external reference voltage
because these volatge are also used for internal biasings for the chip and external for ocillation and error amplifiers biasing

[@vivekbalakrishnan5520]

Good . sir can you pls make a video to decrease the output supply of smps. i tried once with changing the voltage divider network to with trim pot but when decreasing. the voltage getting low and after few steps of rotation the voltage jumps to high
I need to change 12v 2amps smps to 5v

[@sublimeelectrons8699]

HI SIR @Haseeb may i know where i could possibly buy your solder sucker? The one you used on removing the IC 3842.

[@ahmetakyel9161]

Hi, what must be the reference voltage at that ic pin number 8?

[@thirukumarang5842]

Please show new chip reference vcc?

[@aliemlek]

👌👌👍👍

[@isahizhenfahm6576]

Sir, if I may ask. What's the name of the microscope you're using?

[@HaseebElectronics]

it is ANDONSTAR AD407Pro

[@burzaroma-vasile8442]

Hella Sir! What cause the IC to damage? In this case or other PS!
Thank you!

[@ilanbinkovitch6054]

hello. What are the glue drops, on many components, for ? thank you

[@perkulant4629]

To protect against component vibration.

[@TheJavaSync]

Flyback topology?

[@faridcofely]

ref voltage ???

[@HaseebElectronics]

refernce volatge are 5 volt at pin number 8 of 384X series IC (
3842, 3843, 3844, 3845)
these are provided by its internal voltage regulator
these will provide biasing for error amplifiers, oscillator section and internal circuit of the chip

[@faridcofely]

you didn't test the ref voltage after repairing

[@HaseebElectronics]

when the output is available. that is assumed the reference voltage are good
in my previous many videos i demonstrated to test refernce volatge it is 4.95 to 5 volt
if refence voltage are not good, the output will not stable or low output or SMPS will start whistelling sounds

[@faridcofely]

@@HaseebElectronics many thanks you are very good . i appreciate your prompt response

[@HaseebElectronics]

@@faridcofely it is my pleasure

[@rolanddejesus8685]

thank you very much sir...god bless.