{1085} Very simple Repair, SMPS input short circuit, no output
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- เผยแพร่เมื่อ 1 เม.ย. 2024
- In this video number {1085} Very simple Repair, SMPS input short circuit, no output. when connected to series test lamp, lamp doesn't gives indication, that means input open circuit. no output voltage. i demonstrated step by step troubleshooting. i found 6.13 ampere fuse open circuit and CNR-14D471K MOV varistor short circuit
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In this video number {1085 } I explained how to repair delta electronics PMC-24V300W1BA 24 volt 12.5 ampere EOE13010225 switching power supply. its repair and troublshooting process was very complicated due to short circuit in power MOSFETs, their gate drive components, pulse trtansformer, PFC section rectifier S6J 6 amper, 600 volt SMC / DO-214AB rectifier, A2 smd marking zener diode UDZV 5.1B 5.1 volt zener diode
5IN smd diode MMSD4148 Switching diode, 200V, 200mA,
pulse transformer one winding open circuit
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#deltaelectronics #24vsmps #repair - วิทยาศาสตร์และเทคโนโลยี
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I humble requested to our master Muhammad haseeb to kindly please make a video about the technique to test ic for input and output. Why there is ceramic capacitor near ic which vcc pin and output.and where should we put black lead to test input and output of ic. Please sir help
ماشاء الله
Thank you so much for your hard work!
it is my pleasure
👍
Excellent thanks for sharing this informative video
thanks a lot
شكرا يا استاذ
NICE
Thanks for the valuable information ❤
Good evening sir,
I'm Arup and also fan of your channel.
Sir I got a E-Rikshaw Battery charger with Dead Symptom. After check cold test their had PWM CHIP(UTC3842A), SWITCHING MOSFET (12N60), GET CURRENT LIMITING RESISTOR, SOURCE LOAD RESISTOR and RT RESISTOR WAS BLOWNS OUT. From this bad components value I have recovered instead of GET CURRENT LIMITING RESISTOR. After cheking datasheet of PWM CHIP I used the GET CURRENT LIMITING RESISTOR 68 OHM and RT RESISTOR 1K. Where as Other all components was good. After changed all the bad components I had power up by 100watt series lamp. Then problem comming fluctuating. Series lamp also fluctuated. Then I had check all the voltage o/p and opto isolator supply was fluctuated. That's why I had change again opto isolator PC817 and again power up mistakenly direct line. Unfortunately all the bad components again BLOWNS out soon. After all that I had change again all the bad components and this time Power up by the series lamp. Luckily this time problem seen fixed and all the voltage seen good ( O/P, PWM CHIP POWER, OPTO ISOLATOR POWER ). But this time I have seen the somke is come out from some where from the ckt. Due to this reason after power down, I have check again cold test. Then seen Switching FET and it's GET CURRENT LIMITING RESISTOR was over heating. And check also all components primary and secondary site all components was good instead of FET and GET CURRENT LIMITING RESISTOR. After all again power up by series lamp it was seen problem is fixed. But after some time to take a risk I have power up by direct line. But unfortunately this time again also BLOWNS out previous all bad comments. Where as all components over board showing good. One point I have missed to say that here I have used 15N60 MOSFET instead of 12N60.
Please help me sir what should I do and what shall be the checking process? To fix the problem.
Thank you sir
❤👍
Thankful shere ❤❤ god bless you
Very good sir
Great video
Very nice information. Thank you sir
most welcome
Thank u so much. God bless you.
أنت رائع!
Good
Nice video sir. Sir if don't mind, if your time permits you. Please do a video about BAV99w series diode with example circuit. There's no video in internet about this ic. Also have doubt about series diodes. Why they are using in circuit. Because the diode cathod placed in possitive supply and another diode anode is placed in negative or gnd. What's use of it. Its really confusion. according to me there's no use. 😂 because cathode doesn't allow postive supply, anode doesn't allow negative supply (gnd) . Why manufacturers are using like this? Thank you sir.
Salam, very nice video with the good help of the microscope. I please have a question : in an inverter i am trying to repair i see that PIN8 of TL494 is swithcing wile PIN11 is silent, i changed the IC and still no switching, any idea why ? Thanks.
Thanks a lot Mr Haseeb🙏🏻
Please help me for recognise smd component with code 10h04 and sot package and 3 legs.🙏🏻🙏🏻🙏🏻
Thx for usefull videos...and a question?
I have a toshiba smart tv...when power on there is sound and pic but no backlight.
After 10 min working, after shuting down and powering again lights turns on...is the problem in capacitors?
Bu örnekte olduğu gibi MOV neden yanar? ana sebep voltaj dalgalanması mıdır?
Embraco inverter compressor ke circuit ko signal kese dain Start karne k leye.
So another case of probable voltage spike. MOV did its job of sacrificing itself by going short circuit and blowing the fuse. The circuit board looks very dirty and covered in sand.
yes
MOV secifices and protects the next circuit
yes, i got 25 SMPSs of same model from same sender, i think these were stored in junk store without any controlled environment
What should be the resistance of a healthy primary and secondary side, thanks
Normally above 100k is considered good for smps circuits
aleyküm selam verahmetullah
When I test a good power supply and test smd capacitor in circuit reading is not showing in multimeter but this capacitor is good when I on the power supply.. but why sir this smd capacitor not showing reading in multimeter.
Some multimeters cannot measure small valued smd capacitors.
Check the specifications of the multimeter, please
@@HaseebElectronics what type of multimeter is good sir to test smd ceramic capacitor
@@restingroysurong805 uni-t, htc, meco, zoyo brands are famous in India. If want costly then go for fluke.
@@restingroysurong805 you can select fluke multimeters
If i have a welder that stats on Max current all the time. Even if i turn the button and the desplay says 5 amps but the welder is going at Max . Do you have any idea WHy. Thank you
please check and replace its operational amplifier (most of time it is CA341 or lm358) on the control card. it is connected imiidiately after current setting potentiometer
@@HaseebElectronics thanks you i Will try to check it
please replace its op amp ic (most of the time it is CA341) is damaged. try by replacing it
Can the name be uc3843bl ?
If the smd capacitor is burned somewhere and there is no map available, how can we find out its value
Hie sir I am Aaron Chipote, from Zimbabwe, working on a powered amplifier (Hybrid 15inch) with an ic TDA7293. Several times I replaced the ic and upon powering on, it blows up. Can you please assist me to replace this ic without blowing up. It has been repaired before and hand blown the main transformer. Ratings (30v 0 30v, 16.7v 0 16.7v and 12v 0)
I could listen there is hissing noise, is this normal?