Thank you for the explanations Mr. Professor...however, if you don't know how to "read" an electrical diagram and understand the respective circuit, you have little chance of finding the IC...the same problem is with the backlight led testers produced in China... the components inside the box have the specifications erased or a substance is poured that you cannot remove to see the name of the ICs used in the construction of the backlight led tester... I wish you good health and respect, Dan from Europe East
Очень! Очень, очень верные слова! Очень часто приходиться просто перерисовывать фрагмент принципиальной схемы, прямо с платы! И искать по "типовому включению" во множестве даташит.
"if you don't know how to "read" an electrical diagram and understand the respective circuit, you have little chance of finding the IC" - If you don't know how to read a circuit diagram then this kind of thing is not for you anyway. This kind of reverse engineering implies some pretty solid background in electronics. "a substance is poured that you cannot remove" - Yes you can. Resins used for potting can be softened either by boiling water or a good soaking in DCM (make sure the DCM doesn't touch any other components though). Also the trickier part is that a chip in a backlight LED tested will most likely be some kind of PIC, so even if you DID figure out the exact component you'd still need to dump the firmware somehow in order to be able to procure a replacement.
@@CoolKoon it's none of your business about what I know and what I don't know, stop making assumptions about others, even if you're from HU, you're not an expert in the field.. you'd better mind your own business if you don't offer explanations more in-depth about this topic..anyway, this is not the place to play smart and time is too expensive to answer your provocative language..maybe you have a way through Ukraine or Poland and use your native Hungarian language in the area.. .success in challenges
Another good idea is to narrow down possible IC chips and than look at some possible circuits the manufacturer suggest in the datasheet. Amazing how close suspect circuits mimic the factory's suggested circuit designs using their chip...
"Amazing how close suspect circuits mimic the factory's suggested circuit designs using their chip..." - Especially in cases where the chip's surface has been sanded off like this, yeah. Either way doing this chip sanding crap is unbelievably dumb.
I find it helpful to place the populated pcb board over a strong light to illuminate the copper tracks on the underside of the board. This helps to show the connections without mixing up the pin numbers from the reversed view.
At first glance,I'd suspect it's a TL494 or an SG3525(3524),which are commonly used in SMPS circuits. Check pinout/datasheet example circuit to see it if matches up.
It is a very good method, thank you for your explanation. If this doesn’t work you can easily try to touch the rigjomat output signal, which shows you the exact soudtromatical data
감사합니다.일부러 지운 IC를 찾는것은 정말 숨박꼭질 하는 기분도 듭니다. 어디에 숨었을까? 어떻게 숨겼을까? 그런 호기심이 듭니다.ㅎㅎㅎ 보통 IC 주변회로를 그리고 나서 IC를 찾으면 더 쉽고, 나중에 디버깅할때도 편리하고.. PWM IC들은 대부분 많이 알려져서~ IC 명칭을 지울 필요가 있는지 의문입니다.ㅎㅎㅎ 저는 TL494인줄 알았는데..SG3525이군요? 좋은 내용 감사합니다.^^
I see this tall ic in a lot of smps speacily in lcd tv can you explain this type and why not using the small package like 8 legs totally please or mention me a video
pin 10 is shutdown. it is connected to ground to start working. it is also a key point to identify KA3525 / SG3525 if it will pulled up, the IC will stop functioning thanks for your valuable comment
Thank you for posting this. Now you made it look easy LOL, the process you use is straight forward I never thought of doing it this way with the 2 pictrues Thanks again
Thank you for your videos... Please more on sg3525ap as welding inverter. I want to know the operation. I always watch your video on welding m. With sg3525ap i still dont know how it operates. More on trouble it may arise... What is its requirement to operate. I have sg3525ap with known good but still not working weld. Machine. Looking forward for a english sg3525 vid as weld machine.
Hello, dear friend... if we don't have an IC outside the circuit, it means we don't have a circuit and a board. We want to analyze whether it is possible to understand what type of IC it is
You can check what IC they are connected to and to which pin of the IC. Then google the IC datasheet. The component value will likely be in the typical application diagram. If it is a capacitor that is in parallel with another capacitor, just remove the burned one. It will be fine.
@@stefanpejak9131 = Wrong. If the following text is wrong. Ok no problem for me ! Write some additional lines. You have to ask yourself : ' ' ' What was the reason for the failture of a part ? ' ' ' Is there a reason before or after the worse part. Never ever change only the worse part and test the ciruit. A capacitor loose capacity in some years . I know but often this is not the reason for a fault. Or= the working temperature is inside to hot. (Reason= Cheap construction and a build short time usage construction) Often not worth to repair ! ! Other part normally aswell very cheap and will follow to fail soon = Constructed Obsolecence = calculated short lifetime = more devices are sold = more profit Or = high voltage or voltage peaks apeared and destroyed the capacitor. Why ? You have to check the possible reasons. Think like the company owner = Additional parallel capacitor are not cheap ! There must be a very very good reason to spend money for parallel capacitors. See above 80 Ampere current Why is a expensiver circuit layout sold ? Lower impedance ? Lower noise level ? And = Lower temperature in a lot of capacitor (bigger one have smaler surface to spread heat to outside)? High current for a fraction of time (load and-or unload current) ? = Inside high temperature = 80 Amp will cause a lot of current A smaler capacity for better high frequency response and lower noise level. Always think what you have to change additional. You have to understand the circuit diagramm (You never ever find the circuit chart of these PCB) (well you have to look for standart electronic circuits from teachers/internet/ ...) to understand if there is before or behind the worse capacitor the reason. Sometimes silicium parts are used at the boarder of there specifications. The consumer is the first test person and will check if the the device is worse or usable. To test every ultracheap device is for a lot of (china) companys to expensive . These companys accept 2% to 4% gurantee exchanged devices. Sometimes these additional electronic components are very expensive or you cant buy these new. I repaired a expensive circuit and spend a lot of money for new silicium parts. After the first test I need these expensive part again ! There was a reason for the fault and I can not find it. The part dealer sell the part for a lot of money and via internet I can buy a new ready to use PCB. But the owner dont like the risk of a additional fault later. If I pay the broken test parts until it works some month well ... Back to the video = If the capacitor is paralell than the circuit designer spend additional money for a very good reason. Maybe he need more (and exact) capacity and not the standart value (plus-minus the tolerance). Or an other reason ? Or the will reduce the impedance of the big capacitor with a smaler capacitor value and low impedance for a better high frequency response (or reduction). Often the mal capacitor reduce the inner temperature of the bigger capacitor. Remember the inner resitance of a capacitor produce heat. Or the desinger knows that the cpacitor will be inside very hot because of the fast load and unload plus high current values. If he use cheap brands the PCB have a well calculatedtime until fail. The costumer get what he pay. If other companys copy these electronic , than his company have to sell the PCB cheaper. By the way= I repaired a circuit where a fuse can be installed. But later produced PBCs have only a cheap wire. Sometimes it is not a good idea to change a small capacitor dimensional size (with lower voltage) with a higher voltage type. The higer voltage capacitor have a higher impedance and than the reduction of high frequency noise is bad. Always think that a ciruit designer have to choose the cheaperst layout or his boss will never ever like his expert in his company. But he have to find a solution that will last some years (the boss tell him how long the lifetime have to be). This PCB looks like a cheap consumer market construction. Everythink have to be cheap and only have to work until guarantee is gone (plus some month). If these PCB is for hard and longlasting industiral use, you see the quality. And if it is for aviation / naval use or for health devices you see the best quality and the heavy parts are fixed plus sikicon drops against vibration faults. The electronic parts are only from best brands and everythink is better designed.
@@callishandy8133Exactly. Even in electrical design, the cost of production is taken as major criteria. Manufacturer makes the design only to last the warranty period, beyond that they wont even repair the motor. If one chooses expensive product, the quality of internal component is much better. A customer gets what he/she pays for. I have seen repair technicians complaining that customers arent willing to pay sufficient money, hence they find ways to cut corners and use cheaper or used components. Using best quality materials cost more than 70% of the brand new product. So these technicians often refuse to repair the product and instead suggest to buy a brand new one. I being able to design things from scratch, spend extra bucks to get the best out of it.
Sir koi smps power supply me mosfet khrab ho jaye or uski jgah par original se badi capacity ka mosfet dale to Kya shi he ya original value ka hi lgana chahiye . ( Jese 7n60 ki jgah 13n60 lgaye to Kya ye shi se Kam krega? )
Your board is a power inverter circuit board. I have to say that you have been lucky to find out what this IC could be. Most chips are made in Asia. A lot of them do not reflect the standards.
Thanks a lot! Very informative and descriptive Some steps of the flow could be automated to increase overall effectivity and enable bulk pcb and its components recognition and evaluation. I have heard about specialized software for OCR pcb analysis
it becomes very difficult but we can take approach in this case, first we need to find vcc, ground, oscillator pin and then we can find some equivalent pinout. but the program code is biggest problem.
Aslam o alikum haseeb bhai me 60 or 72 volts lithium charger banana chahta hon primary section design kar liya he secondry section k liye kon si ic chahiye ho gi jis me auto cut off ho full charge k bad kindly help karain
Thanks for your info and ideas. Technics in analizing unknown ic.. but it seems if the pcb is in reverse side, the pin number is reverse in actual top side view, the comment of other guy of uding bright ligth to trace copper is much better, thanks.
Asalamu alaikum sir i hv a 12v 10 amp battery charger smps which turns only only once on plugging in and then shutdowns but if plugged in through series then works ok what can be the problem it is using 7m0880 pwm ic 5 pins
I am using camtasia 8 screen recording software it records without yellow cursor but while processing there is option to use cursor options. it have too many options to highlight the cursor position
salam sir i saw a video of person testing triac on washing machine motherboard he don't desolder triac he use serise lamp and miltimetre on miliamp mode and i don't inderstand very well can you please axplain these method think you
This method works only because you already know its a PWM switching IC as apllied to the SMPS. I has an induction cooker with an exploded IC and only if I have access to the schematic will I ever know what IC to replace. Nevertheless, a useful video.
eve we don't know the part number, but this technique works. i use this method very often. are you facing problem with small ic (power converter) or main ic? you can send its picture to my whatsapp 00962-79-5324272 or gmail id ashraf4ta4
Would not it be easier to try to find the diagram of the complete circuit and find the component in question? What to do if there are a lot of 16-pin ICs?
the biggest problem is that, no documentation is available for these chinese unbranded power supplies. just we can download the datasheet or application note for the ic. to find the datasheet, we need part number if part number is removed then it becomes hurdle
both are same KA3525 is manufactured by Fairchild semiconductors, On semiconductors, while SG3525 is made by STMicroelectronics, On semiconductors, freescale, Microsemi,
What are you talking about? what you are saying is pin one on the tracks is either pin 8 or pin 16 the pin numbers are not the same as looking from the component side, on the track side pin one can only be bottom left or top right??
oh no dear i used photo editing tool to flip and rotate. so front and rear side view is same. kindly if look the video carefully again and you can see board direction in same side.
The IC chip could be an MCU chip, and may have various perepherals and exceution speed, different timings and so on. I once have used an MCU to act like an SMPS supply and the MCU had analog input. Even if we guessed the MCU then how about the code space? The perepherals? the timings? the RAM size, Flash size, EEPROM and so on? It will take forever to make a guess. My best bet is to take the board number and purchase new board from the manufacturer or distributer.
When I 1st saw the PCB, I immediately thought SG3527. This is because the topology of the power transistor and feedback looks like an SG3527. You need to be careful here. The SG3525 and SG3527 are both very popular widely sourced PWM controllers. The SG3525 output stage is NOR logic. This gives a LOW output for the OFF state. The SG3527 output stage is OR logic. This gives a HIGH output for the OFF state. So, you are on the right track. However, you need to completely reverse engineer the driver circuit for the switching pass transistors. Given that it looks like this thing is using an E-I core, the switching transistors are probably arranged as a push-pull configuration.
yes it is SG3525. as my viewer installed it in pcb and tested it's function it is working good if SG3527 is installed in place of 3525, it fails to provide regulation
Thank you for the explanations Mr. Professor...however, if you don't know how to "read" an electrical diagram and understand the respective circuit, you have little chance of finding the IC...the same problem is with the backlight led testers produced in China... the components inside the box have the specifications erased or a substance is poured that you cannot remove to see the name of the ICs used in the construction of the backlight led tester... I wish you good health and respect, Dan from Europe East
best regards and special thanks for your valuable addition.
you are right. sometimes there becomes a bottle-neck.
Очень! Очень, очень верные слова!
Очень часто приходиться просто перерисовывать фрагмент принципиальной схемы, прямо с платы!
И искать по "типовому включению" во множестве даташит.
"if you don't know how to "read" an electrical diagram and understand the respective circuit, you have little chance of finding the IC" - If you don't know how to read a circuit diagram then this kind of thing is not for you anyway. This kind of reverse engineering implies some pretty solid background in electronics.
"a substance is poured that you cannot remove" - Yes you can. Resins used for potting can be softened either by boiling water or a good soaking in DCM (make sure the DCM doesn't touch any other components though).
Also the trickier part is that a chip in a backlight LED tested will most likely be some kind of PIC, so even if you DID figure out the exact component you'd still need to dump the firmware somehow in order to be able to procure a replacement.
@@CoolKoon it's none of your business about what I know and what I don't know, stop making assumptions about others, even if you're from HU, you're not an expert in the field.. you'd better mind your own business if you don't offer explanations more in-depth about this topic..anyway, this is not the place to play smart and time is too expensive to answer your provocative language..maybe you have a way through Ukraine or Poland and use your native Hungarian language in the area.. .success in challenges
a *FANTASTIC* example of reverse enginering HANDS ON in the most meaningful & practical example !!!
May God always bless you & your family !!! 😊😊😊😉
best regards and special thanks
Like a detective constable for electronics. Congratulations.
best regards and special thanks for your valuable comment
Another good idea is to narrow down possible IC chips and than look at some possible circuits the manufacturer suggest in the datasheet. Amazing how close suspect circuits mimic the factory's suggested circuit designs using their chip...
i am thankful for sharing a great idea. it can also be helpful to take approach
"Amazing how close suspect circuits mimic the factory's suggested circuit designs using their chip..." - Especially in cases where the chip's surface has been sanded off like this, yeah. Either way doing this chip sanding crap is unbelievably dumb.
I find it helpful to place the populated pcb board over a strong light to illuminate the copper tracks on the underside of the board. This helps to show the connections without mixing up the pin numbers from the reversed view.
Thanks for sharing the systematic approach in finding an answer in such a difficult situation. Very beautifully explained 👌
it is my pleasure
Asslamalkuam Bhai Mashallah Nice sharing Information video 👌🌻✌✌
wa alaikum salaam bhai
Brilliant. Thank you for this, it's little things like this that once I know, it seems that should have been obvious years ago.
Great approach in identifying the unknown IC. Appreciate vry much Sir.
thanks a lot
My first guess was that it was a 3524 or 25, as they're common enough to be considered the LM555 of switcher control chips.
At first glance,I'd suspect it's a TL494 or an SG3525(3524),which are commonly used in SMPS circuits. Check pinout/datasheet example circuit to see it if matches up.
U are such a clever guy. I love yr tutorials they are excellent!!! This one is no exception
best regards
Yes, very informative logical approach. thank you.
it is my pleasure
Thanks a lot. Subhanallah I was going to ask you the same question regarding IC without id numbers.
It is a very good method, thank you for your explanation. If this doesn’t work you can easily try to touch the rigjomat output signal, which shows you the exact soudtromatical data
Perfect janaab. Congrats
Mostly hard to comprehend,but very informative. Thanks for video. I have the same question
Salaam Bhai Jee Main Theek Hun Shukariya
Very good and useful information sir thanks for sharing this knowledge to us
감사합니다.일부러 지운 IC를 찾는것은 정말 숨박꼭질 하는 기분도 듭니다.
어디에 숨었을까? 어떻게 숨겼을까? 그런 호기심이 듭니다.ㅎㅎㅎ
보통 IC 주변회로를 그리고 나서 IC를 찾으면 더 쉽고, 나중에 디버깅할때도 편리하고..
PWM IC들은 대부분 많이 알려져서~ IC 명칭을 지울 필요가 있는지 의문입니다.ㅎㅎㅎ
저는 TL494인줄 알았는데..SG3525이군요?
좋은 내용 감사합니다.^^
그래, 자기야. 대부분의 제조업체는 디자인을 숨기기 위해 숫자를 지웁니다. 따라서 이 기술을 사용하여 알 수 없는 ic 번호를 찾으려고 시도할 수 있습니다.
좋은 아침입니다.
옳은
회로가 IC 주변에 그려져 있을 때 IC를 찾는 것이 더 쉽습니다.
Correct
It is easier to find the IC when the circuit has been drawn around the IC.
I see this tall ic in a lot of smps speacily in lcd tv can you explain this type and why not using the small package like 8 legs totally please or mention me a video
Sir, Very good observation , you are very expert !
best regards
One of my motives for coming to TH-cam channel and your activity🙏✍💯👌💫❤🔥
it is my pleasure
Is pin 1 not opposite on green board. As you have flipped the board pins should be on opposite sides?
i flipped and rotated it in such configuration, that pin 1 in top sided and pin 1 in bottom comes at same direction and location
You did not mentioned that pin 10 was ground to begin with when comparing to the google file , anyway your systems looks very helpful thank you.
pin 10 is shutdown. it is connected to ground to start working. it is also a key point to identify KA3525 / SG3525
if it will pulled up, the IC will stop functioning
thanks for your valuable comment
Terima kasih Sr.. sudah berbagi ilmu electronik yang sangat bermanfaat.
Wow! Well done and very well explained. You have a new subscriber for sure.
most welcome and special thanks
Thank you for posting this. Now you made it look easy LOL, the process you use is straight forward I never thought of doing it this way with the 2 pictrues Thanks again
it is my pleasure
Very useful information. Thanks for sharing.
Sir your method is very good is there any other way to find the erased ic number... ?
this is very good helpful analytic tutorial
Thank you
thanks a lot
Thank you for your videos...
Please more on sg3525ap as welding inverter. I want to know the operation.
I always watch your video on welding m. With sg3525ap i still dont know how it operates. More on trouble it may arise... What is its requirement to operate. I have sg3525ap with known good but still not working weld. Machine. Looking forward for a english sg3525 vid as weld machine.
Informative vedeo. Thank u so much. God bless you.
Good morning from Greece, your video is very nice and very understandable
most welcome
Hello, dear friend... if we don't have an IC outside the circuit, it means we don't have a circuit and a board. We want to analyze whether it is possible to understand what type of IC it is
is there any part number or marking on that ic??
V informative Thanks brother. Great apprauch.
it is my pleasure
valuable suggestion, many thanks! What about finding info on much simpler components such as burnt SMD resistors/capacitors?
You can check what IC they are connected to and to which pin of the IC. Then google the IC datasheet. The component value will likely be in the typical application diagram. If it is a capacitor that is in parallel with another capacitor, just remove the burned one. It will be fine.
@@stefanpejak9131 = Wrong.
If the following text is wrong.
Ok no problem for me ! Write some additional lines.
You have to ask yourself : ' ' ' What was the reason for the failture of a part ? ' ' '
Is there a reason before or after the worse part.
Never ever change only the worse part and test the ciruit.
A capacitor loose capacity in some years . I know but often this is not the reason for a fault.
Or= the working temperature is inside to hot. (Reason= Cheap construction and a build short time usage construction)
Often not worth to repair ! !
Other part normally aswell very cheap
and will follow to fail soon = Constructed Obsolecence = calculated short lifetime = more devices are sold = more profit
Or = high voltage or voltage peaks apeared and destroyed the capacitor. Why ? You have to check the possible reasons.
Think like the company owner = Additional parallel capacitor are not cheap !
There must be a very very good reason to spend money for parallel capacitors. See above 80 Ampere current
Why is a expensiver circuit layout sold ?
Lower impedance ? Lower noise level ?
And = Lower temperature in a lot of capacitor (bigger one have smaler surface to spread heat to outside)?
High current for a fraction of time (load and-or unload current) ? = Inside high temperature = 80 Amp will cause a lot of current
A smaler capacity for better high frequency response and lower noise level.
Always think what you have to change additional.
You have to understand the circuit diagramm
(You never ever find the circuit chart of these PCB)
(well you have to look for standart electronic circuits from teachers/internet/ ...)
to understand if there is before or behind the worse capacitor the reason.
Sometimes silicium parts are used at the boarder of there specifications.
The consumer is the first test person and will check if the the device is worse or usable.
To test every ultracheap device is for a lot of (china) companys to expensive .
These companys accept 2% to 4% gurantee exchanged devices.
Sometimes these additional electronic components are very expensive or you cant buy these new.
I repaired a expensive circuit and spend a lot of money for new silicium parts. After the first test I need these expensive part again ! There was a reason for the fault and I can not find it. The part dealer sell the part for a lot of money and via internet I can buy a new ready to use PCB. But the owner dont like the risk of a additional fault later. If I pay the broken test parts until it works some month well ...
Back to the video =
If the capacitor is paralell than the circuit designer spend additional money for a very good reason.
Maybe he need more (and exact) capacity and not the standart value (plus-minus the tolerance). Or an other reason ?
Or the will reduce the impedance of the big capacitor with a smaler capacitor value and low impedance for a better high frequency response (or reduction). Often the mal capacitor reduce the inner temperature of the bigger capacitor.
Remember the inner resitance of a capacitor produce heat.
Or the desinger knows that the cpacitor will be inside very hot because of the fast load and unload plus high current values.
If he use cheap brands the PCB have a well calculatedtime until fail. The costumer get what he pay.
If other companys copy these electronic , than his company have to sell the PCB cheaper.
By the way= I repaired a circuit where a fuse can be installed. But later produced PBCs have only a cheap wire.
Sometimes it is not a good idea to change a small capacitor dimensional size (with lower voltage) with a higher voltage type. The higer voltage capacitor have a higher impedance and than the reduction of high frequency noise is bad.
Always think that a ciruit designer have to choose the cheaperst layout or his boss will never ever like his expert in his company.
But he have to find a solution that will last some years (the boss tell him how long the lifetime have to be).
This PCB looks like a cheap consumer market construction. Everythink have to be cheap and only have to work until guarantee is gone (plus some month).
If these PCB is for hard and longlasting industiral use, you see the quality.
And if it is for aviation / naval use or for health devices you see the best quality and the heavy parts are fixed plus sikicon drops against vibration faults. The electronic parts are only from best brands and everythink is better designed.
@@callishandy8133Exactly. Even in electrical design, the cost of production is taken as major criteria. Manufacturer makes the design only to last the warranty period, beyond that they wont even repair the motor. If one chooses expensive product, the quality of internal component is much better. A customer gets what he/she pays for.
I have seen repair technicians complaining that customers arent willing to pay sufficient money, hence they find ways to cut corners and use cheaper or used components. Using best quality materials cost more than 70% of the brand new product. So these technicians often refuse to repair the product and instead suggest to buy a brand new one. I being able to design things from scratch, spend extra bucks to get the best out of it.
@@callishandy8133 I learned a lot from your comment, thank you sir.
Very nice idea to find the IC type and number. Also we can use this methode for reverse engineering...
Sir koi smps power supply me mosfet khrab ho jaye or uski jgah par original se badi capacity ka mosfet dale to Kya shi he ya original value ka hi lgana chahiye . ( Jese 7n60 ki jgah 13n60 lgaye to Kya ye shi se Kam krega? )
Weldon I like your video for one reason alone. You used English Language
Thanks keep it up
I just subscribed
it is my pleasure
Your board is a power inverter circuit board. I have to say that you have been lucky to find out what this IC could be. Most chips are made in Asia. A lot of them do not reflect the standards.
Teşekkürler efendim. Sağlıklı huzurlu ve bol kazançlı günler dilerim. Allah CC sizi korur inşallah.
selam o aleyküm
çok teşekkürler canım kardeşim mübarek kal
Well done. Good detective work.
Wa'alaikumussalam Warahmatullahi Wabarakatuh! Thanks for your explanations. 👍
Thanks a lot!
Very informative and descriptive
Some steps of the flow could be automated to increase overall effectivity and enable bulk pcb and its components recognition and evaluation.
I have heard about specialized software for OCR pcb analysis
👌👌🌹GOOD TICHING KARTE HO AP THANKS 👌🌹💖😂😆
thanks a lot
What is the use of this technique if the IC is programmable..
it becomes very difficult
but we can take approach in this case, first we need to find vcc, ground, oscillator pin and then we can find some equivalent pinout.
but the program code is biggest problem.
Nice investigation. Good job
best regards
Excellent thanks for sharing this informative video
it is my pleasure
Very good explanation and informative technical support
waalaikumussalam wbt thanks so much for tips bro.. 👍
Aslam o alikum haseeb bhai me 60 or 72 volts lithium charger banana chahta hon primary section design kar liya he secondry section k liye kon si ic chahiye ho gi jis me auto cut off ho full charge k bad kindly help karain
Thanks for your info and ideas. Technics in analizing unknown ic.. but it seems if the pcb is in reverse side, the pin number is reverse in actual top side view, the comment of other guy of uding bright ligth to trace copper is much better, thanks.
Sir Im a new subscriber to your channel i like to learn more things about electronics..
Excellent video, very much appreciated.
it is my pleasure
Thanks so much for sharing wonderful video brother
best regards
Asalamu alaikum sir i hv a 12v 10 amp battery charger smps which turns only only once on plugging in and then shutdowns but if plugged in through series then works ok what can be the problem it is using 7m0880 pwm ic 5 pins
Excellent. How to work ct and pt in a circuit
best regards
Thank you, it was a good explanation.
it is my pleasure
Fantastic help.....many thanks.
Hello ,how do you get this yellow circle under your mouse? Is it possible to do this on Android? Thanks
I am using camtasia 8 screen recording software
it records without yellow cursor but while processing there is option to use cursor options. it have too many options to highlight the cursor position
@@HaseebElectronics thanks for your reply 🙏
salam sir i saw a video of person testing triac on washing machine motherboard he don't desolder triac he use serise lamp and miltimetre on miliamp mode and i don't inderstand very well can you please axplain these method think you
Brilliant man you are
best regards
Excelente aula, muito obrigado.
it is my pleasure
Thank you for sharing this Video
You are the Best..
best regards and special thanks
This method works only because you already know its a PWM switching IC as apllied to the SMPS. I has an induction cooker with an exploded IC and only if I have access to the schematic will I ever know what IC to replace. Nevertheless, a useful video.
eve we don't know the part number, but this technique works. i use this method very often.
are you facing problem with small ic (power converter) or main ic?
you can send its picture to my whatsapp 00962-79-5324272
or gmail id ashraf4ta4
Would not it be easier to try to find the diagram of the complete circuit and find the component in question? What to do if there are a lot of 16-pin ICs?
the biggest problem is that, no documentation is available for these chinese unbranded power supplies. just we can download the datasheet or application note for the ic.
to find the datasheet, we need part number
if part number is removed then it becomes hurdle
very original algloritm of the search for the type of detail !
Compliments, really compliments.
best regards
thanks, LM324N IC is the easiest to trace, pin 4 being +Vcc and pin 11 being -Vcc
Amazing!!! Thank you.
best regards
OMG you are so good at it
thanks a lot
sir, there is looking a difference between KA and SG, what is funda? you have said sg3525A, and in this google is ka3525A.
both are same
KA3525 is manufactured by Fairchild semiconductors, On semiconductors,
while
SG3525 is made by STMicroelectronics, On semiconductors, freescale, Microsemi,
Good video
Very knowledge full
most welcome
Good luck sir 🎉
best regards
How to find SMD transistor missing part number??? Please help me 🙏🙏🙏
Sir, How did you say that pin 12 is ground ? Kindly help when u r free. From India . Thanks
Great content. Thank you.
Good information 👍👏👋
thanks a lot dear friend
Very clever....thanks....sir ji...
it is my pleasure
New knowledge to me thanks
What an excellent video
thanks a lot
Thanks for sharing. 😉👌🏻
most welcome
Yes r u avoinics engenier plz tell me
yes brother
Very informative video ❤❤❤
thanks a lot
Good explanation
it is my pleasure
What are you talking about? what you are saying is pin one on the tracks is either pin 8 or pin 16 the pin numbers are not the same as looking from the component side, on the track side pin one can only be bottom left or top right??
oh no dear
i used photo editing tool to flip and rotate. so front and rear side view is same.
kindly if look the video carefully again and you can see board direction in same side.
The IC chip could be an MCU chip, and may have various perepherals and exceution speed, different timings and so on. I once have used an MCU to act like an SMPS supply and the MCU had analog input. Even if we guessed the MCU then how about the code space? The perepherals? the timings? the RAM size, Flash size, EEPROM and so on? It will take forever to make a guess. My best bet is to take the board number and purchase new board from the manufacturer or distributer.
Nice technique.
thanks a lot
When I 1st saw the PCB, I immediately thought SG3527. This is because the topology of the power transistor and feedback looks like an SG3527.
You need to be careful here.
The SG3525 and SG3527 are both very popular widely sourced PWM controllers.
The SG3525 output stage is NOR logic. This gives a LOW output for the OFF state.
The SG3527 output stage is OR logic. This gives a HIGH output for the OFF state.
So, you are on the right track. However, you need to completely reverse engineer the driver circuit for the switching pass transistors. Given that it looks like this thing is using an E-I core, the switching transistors are probably arranged as a push-pull configuration.
yes it is SG3525. as my viewer installed it in pcb and tested it's function
it is working good
if SG3527 is installed in place of 3525, it fails to provide regulation
@@HaseebElectronics Of course. In your case, the driver logic must be positive true. Thus, the SG3527 would absolutely keep everything turned off.
Super bro
Nice explanation sir
it is my pleasure
Great 👍job!!!!
best regards
Aleikum asalam.. Thanks great! idea
wa alaikum salaam
best regards
you can merge the 2 photos in photo editor software or any alternative to get circuit diagram , then search by image
yes you are right.
good explanation.
best regards
Very educational idea
awesome victory !!!
best regards
Nice sharing brother.
it is my pleasure
خیلی عالی بود👍👍👍