OpAmp: -Please don't reverse my voltage! Sorin : what voltage? Oupsy! Let me put right! Hello?.. hello, are you there? Zener: Hey resistor, pretend you are dead. Resistor: no problem, I broke one joint. MosFet: who the hell drained me some positives? Driver: I can't feel my legs... relay: And mine are tied..
ahah this made my day ... here in my service we have a word when you say that all should be fine and work but you are not sure if it is - "everything is power and wire" then you power it on and hear click ... "now everything is all wire" :D
I just want to say i love this guy!!!! I love how he owns everything he does including errors but despite this hes obviously competent and doing this for a long time his electronics knowledge combined with his great character makes him an excellent teacher and its a pleasure watching his tutorials thankyou sir..........
I have seen old stereos have 2 or 3 bad pins and when you start moving the board or fixing the bad pins you have 10 more. It's called old used stuff that has been through 10000 heat and cool cycles, vibration and just getting old with hidden problems with corrosion. Then you start finding bad caps and resistors when a load hits them. What does not kill us makes us stronger.
There's a 1 kohm resistor in the circuit, the zener voltage is 15V, the input voltage is 45V. So the voltage over the resistor is 30V. The current through the resistor is 30mA (30V/1Kohm). To have a stable zener voltage the current of your load should be at about 10 times smaller than the current through your resistor, so about 3mA. 80 mA is waaaaaay to much. Zener-diode circuits are only intended for very small loads. Be careful with inverse polarization of the supply voltage. The opamp gets destroyed way below the current limit of your power supply. I think your zener is broken and you got 45V on your chip which destroyed it. Replace the zener and test before inserting the chip!
Do you think he will need to replace the zenner as well now? I had a TV that the 1k resistor blew - it blew a similar chip - replaced them both but still didn't power on . I lifted a leg of the zenner and it powered up. Replaced the zenner and all good.
With 80 mA draw current, all the voltage will drop on the resistor and you will have zero on the other side. He needs to order few chips , you never know. Also after chip removal, zener diode must be tested.
Personally I think the zener doide got destroyed during last repair and the chip temporarily worked on -45V instead of -15V. After a day the chip got burned out.
Also inserting voltage on the zener, hoping the supply will limit the current usually doesn't work. Suppose you limit the current to 200mA. The zener is 15V. That's 3W. Your zener would likely be destroyed.
perfection is a kind of sickness. who can't make mistakes ? is there anyone exist who dont make mistake ? are we judges or are we teachers ? or are we just learners ? the man wants to teach something . but someone critisizes his fault. his attention can't breake ? he is a human as we are . he can make mistake as we are. critising can help someone who make mistakes. but i read comments and, most of them critisez the man. the problem must be critised not the man. the problem is abvious that "why there is voltage on the speaker and why there is 45 v but on the same way on the pin that there is no voltage " if he would fix it with out speaking or making video, he couldnt make mistake easly. he divides his attention on speaking, on video,on watchers ,on background (the customers speaking ) and so on. giving attention on one job is easy . put yourself on his status and give a comment . go on Sorin , you shouldnt care who judges you. always the judges men walk around as a jobless men.
Mustafa Dursun Well, sorry to tell you that this channel is called Electronic Repair School. Here I saw inexperience in symmetrical power supplied device. So it shouldn't be online. At least.
@@lambertax yea you are right on the name of channell. Who are you then? İ mean , who give you permission to judge the person? İt can happen more while online recording the mistakes even it was simple one. He could make a video offline and fixed it and upload it without any mistakes. İn the schools, the teacher doesnt teach to not make mistakes. The teachers teach that "dont afraid of doing mistakes". Teachers are not perfect even noone is. İn the real school, if teacher say something wrong by words , it will be also a mistake. So it can happen, it is normal. Mistakes can be edited easly. İf you say that you could do the best with out any mistakes ,then show us.or open a channell named "how to be perfect" .
@@lambertax Why should it be removed? We cant learn from mistakes? Its not like you are paying for this content. And for Mustafa There is a difference with wanting perfection and claiming to be perfect. We all have certain expectations and when they are not meant we will judge. You don't need permission when judging in the court of personal opinion. Sorin is a great guy and I enjoy all his videos even the ones where he has a head scratching moment. Honestly his pleasing personality sense of humor is why I keep coming back. I don't agree with Great Geekax but he is entitled to his opinion and UA-cam is a public forum where you are allowed to speak your mind. Don't sweat it so much.
giorgos ioannidis not really, it's the second time I watch this channel and there was twice beginners faults. On this one, inverting two time the power supply... come on!
love it got to smell that rosin before get to work i did get some myself few weeks ago smells great i grew up at lumber mill in new england united states [ missed the smell of pine trees thank you Sorin for bringing me back
Enjoyed this video very much. It showed patience and perseverance. This is a situation where you get so disgusted you want to throw the board against a wall! It was very professional to watch you wrestle your way through the fault finding process, bit by bit and maintain persistence to locate the fault. Thank you for sharing this experience. 👍
The zener took a big hit when you reversed the power supply of the negative rail. Twice, haha. It seemed that your current was limited at approx. 750mA. That's too much for the zener. Its forwarding voltage drop was approx. 1.2V with that current, I believe I saw at your power supply's displays. It should not get above 0.7V. Good that it was just for a short time. Maybe it would be a good thing to check the supply voltage for the chip, when the old chip is out and before you put in the new chip. It is hard to believe that just +1.2V on its negative supply voltage line killed that chip. It's an opamp, which does not have a direct line to the amplifier's ground. So, maybe one of the big transistors is shorted or loosely connected, like that resistor you found. That could wildly unbalance the whole amplifier, including the points where the chip's outputs are connected to. This will cause abnormal high current usage of the chip and it explains why it only uses a lot of current when the rest of the amplifier is powered as well. Please keep on posting vids about this repair. I'm curious on how this ends and what the problem is with this thing. First, I would check the transistors again, and continue from there. Good luck!
i look forward to next video..because no matter what the rail must be all same voltage or there is broken track or bad joint...now the chip current is high ....but op amp reads reference voltage ...maybe the other side of op amp circuit is damaged....i dont know ..nice to see next vid...i think the d on the end of chip means it is DUAL...SO MAYBE WRONG CHIP.
Coincidences can be a bugger. Just watching 2.20. Guna be a short video. 43 mins it seems. Will watch it all and learn something. I genuinely mean that. love you Sorin and liked before watching ;)
If you took your car in for an oil change and the instrument cluster dummy light indicates it has low oil the next day would you no take it back? This isn't an unrelated thing like oil and wiper blades. Sorin did the right thing taking it back on to assess the issue. He can now assess and determine if this new repair falls under that warranty and act accordingly.
Sorin what is going on. Never saw you struggling so much bye now. Don’t focus too much on one point. I now you can fix it and you will. And don’t let you get down under the pressure from the people who never share their work on the internet to give us something to learn from.
Don’t want to teach you how to such eggs but! Use a socket, check zener voltages before inserting IC. IC driven output stages are notoriously difficult to sort as isolation of sections is hard to achieve. Absence of circuit diagram is an issue and the protection scheme seems very unusual. I look forward to progress. Best of luck.
I have seen this kind of fault a radio. The radio didnt have any radio station. The main frequansy coil's one of leg has open curcuit. The proplem sold one minute but to findig problem was 2 hours 😂
Getting 45V on the speaker output indicates to me that some major short or wrong routing of connecting wires has occurred. If I previously had changed a relay I would suspect that the two relays were not routed the same way.
Always take the IMEI or serial number on a device like this to make sure they're not bringing back different devices that look the same claiming warranty
@@josepeixoto3384 not all the time lol. I had one that burnt but would momentarily close and open from the heat. It was cracked in half somehow but drivin me nuts tryin too Find it lol
You should think at first- why pin of relay has been melted? What current was then and what this was consequence. It could be problem with op amp oscillation. Try find issue on oscilloscope.
rossmann is an idiot, shouting, screaming and coaching. he is so irritating, constantly bitching about apple and still repair them. must have been the worst job on the planet, to hate something but still do it hahaha, fucking idiot
Strange.... he always kind of does a patchwork work around type repair. Then things go bad surely more than not. Personally I think it was his job as the skilled pro to find the root cause of the problem the first time, fix it, and then stand behind the repair assuring the amp doesn't die again. Well it died again!! The customer doesn't know electronics or what components were effected to begin with. It's likely several were effected if you observe them all. I would say it's on Sorin. Check it out thoroughly before you send it home.
we want to see the complete repair so please make the video with the replacement chip man you are showing us the reality not like other chanels where the repair seems a fairies tales and everything is repaired at first so please make the video with the replacement chip thanks
I have a pair of Bowers & Wilkins CM10 speakers, which cost £4,000. If you "fixed" my amp and fried my speakers with 45V, what would you tell me? I'm rather concerned that you use secondhand parts to repair items and don't seem to buy new components. Is this common practice where you live? What country, please?
OpAmp: -Please don't reverse my voltage!
Sorin : what voltage? Oupsy! Let me put right! Hello?.. hello, are you there?
Zener: Hey resistor, pretend you are dead.
Resistor: no problem, I broke one joint.
MosFet: who the hell drained me some positives?
Driver: I can't feel my legs...
relay: And mine are tied..
nice one
ahah this made my day ... here in my service we have a word when you say that all should be fine and work but you are not sure if it is - "everything is power and wire" then you power it on and hear click ... "now everything is all wire" :D
best comment i read today ... probably the whole week :)
Great one ! 😁
Great one there, thats funny
I just want to say i love this guy!!!!
I love how he owns everything he does including errors but despite this hes obviously competent and doing this for a long time his electronics knowledge combined with his great character makes him an excellent teacher and its a pleasure watching his tutorials thankyou sir..........
this is a true live scene, what everhappen we see because you did not hide it...thanks for being True
I have seen old stereos have 2 or 3 bad pins and when you start moving the board or fixing the bad pins you have 10 more. It's called old used stuff that has been through 10000 heat and cool cycles, vibration and just getting old with hidden problems with corrosion. Then you start finding bad caps and resistors when a load hits them.
What does not kill us makes us stronger.
I love that you are very passionate about your work. Your passion is addicting.
There's a 1 kohm resistor in the circuit, the zener voltage is 15V, the input voltage is 45V. So the voltage over the resistor is 30V. The current through the resistor is 30mA (30V/1Kohm). To have a stable zener voltage the current of your load should be at about 10 times smaller than the current through your resistor, so about 3mA. 80 mA is waaaaaay to much. Zener-diode circuits are only intended for very small loads.
Be careful with inverse polarization of the supply voltage. The opamp gets destroyed way below the current limit of your power supply.
I think your zener is broken and you got 45V on your chip which destroyed it.
Replace the zener and test before inserting the chip!
Do you think he will need to replace the zenner as well now? I had a TV that the 1k resistor blew - it blew a similar chip - replaced them both but still didn't power on . I lifted a leg of the zenner and it powered up. Replaced the zenner and all good.
With 80 mA draw current, all the voltage will drop on the resistor and you will have zero on the other side. He needs to order few chips , you never know. Also after chip removal, zener diode must be tested.
Personally I think the zener doide got destroyed during last repair and the chip temporarily worked on -45V instead of -15V. After a day the chip got burned out.
Shorten zener and destroyed chip. Reversing polarity doesn't forgive.
Also inserting voltage on the zener, hoping the supply will limit the current usually doesn't work. Suppose you limit the current to 200mA. The zener is 15V. That's 3W. Your zener would likely be destroyed.
perfection is a kind of sickness. who can't make mistakes ? is there anyone exist who dont make mistake ?
are we judges or are we teachers ? or are we just learners ?
the man wants to teach something . but someone critisizes his fault.
his attention can't breake ? he is a human as we are . he can make mistake as we are.
critising can help someone who make mistakes. but i read comments and, most of them critisez the man.
the problem must be critised not the man.
the problem is abvious that "why there is voltage on the speaker and why there is 45 v but on the same way on the pin that there is no voltage "
if he would fix it with out speaking or making video, he couldnt make mistake easly.
he divides his attention on speaking, on video,on watchers ,on background (the customers speaking ) and so on.
giving attention on one job is easy . put yourself on his status and give a comment .
go on Sorin , you shouldnt care who judges you.
always the judges men walk around as a jobless men.
Mustafa Dursun Well, sorry to tell you that this channel is called Electronic Repair School. Here I saw inexperience in symmetrical power supplied device. So it shouldn't be online. At least.
@@lambertax yea you are right on the name of channell. Who are you then? İ mean , who give you permission to judge the person?
İt can happen more while online recording the mistakes even it was simple one.
He could make a video offline and fixed it and upload it without any mistakes.
İn the schools, the teacher doesnt teach to not make mistakes. The teachers teach that "dont afraid of doing mistakes".
Teachers are not perfect even noone is.
İn the real school, if teacher say something wrong by words , it will be also a mistake. So it can happen, it is normal.
Mistakes can be edited easly. İf you say that you could do the best with out any mistakes ,then show us.or open a channell named "how to be perfect" .
@@lambertax Why should it be removed? We cant learn from mistakes? Its not like you are paying for this content.
And for Mustafa There is a difference with wanting perfection and claiming to be perfect. We all have certain expectations and when they are not meant we will judge. You don't need permission when judging in the court of personal opinion.
Sorin is a great guy and I enjoy all his videos even the ones where he has a head scratching moment. Honestly his pleasing personality sense of humor is why I keep coming back. I don't agree with Great Geekax but he is entitled to his opinion and UA-cam is a public forum where you are allowed to speak your mind. Don't sweat it so much.
Great Geekax Who are you to judge him and “it shouldn’t be online” ? Sorin is more than experienced, you’re here just to criticise ?
i hope those negative comments do not affect your positive helpful mood ... keep calm and teach us ..
The knowledge you sharing is valuable keep up the good work!!!!!
giorgos ioannidis not really, it's the second time I watch this channel and there was twice beginners faults. On this one, inverting two time the power supply... come on!
@@lambertax if you dont like it you just walk away from this channel.i Dont say no to sharing knowledge on electronic all lessons are welcome.
maybe the transformer is telling you "use me on your power supply project" 😂😂😂
love it got to smell that rosin before get to work i did get some myself few weeks ago smells great i grew up at lumber mill in new england united states [ missed the smell of pine trees thank you Sorin for bringing me back
Enjoyed this video very much. It showed patience and perseverance. This is a situation where you get so disgusted you want to throw the board against a wall! It was very professional to watch you wrestle your way through the fault finding process, bit by bit and maintain persistence to locate the fault. Thank you for sharing this experience. 👍
Three video on one day , pure Gold
LOL..."I'm stupid or what?"...Love you just the way you are...
You killed the op-amp by applying reverse voltage.
I must be on the third chapter of this, it is like a suspense movie, thank you Sorin San you are a true master of suspense besides electronics
haha
The zener took a big hit when you reversed the power supply of the negative rail. Twice, haha. It seemed that your current was limited at approx. 750mA. That's too much for the zener. Its forwarding voltage drop was approx. 1.2V with that current, I believe I saw at your power supply's displays. It should not get above 0.7V. Good that it was just for a short time.
Maybe it would be a good thing to check the supply voltage for the chip, when the old chip is out and before you put in the new chip.
It is hard to believe that just +1.2V on its negative supply voltage line killed that chip. It's an opamp, which does not have a direct line to the amplifier's ground.
So, maybe one of the big transistors is shorted or loosely connected, like that resistor you found. That could wildly unbalance the whole amplifier, including the points where the chip's outputs are connected to. This will cause abnormal high current usage of the chip and it explains why it only uses a lot of current when the rest of the amplifier is powered as well.
Please keep on posting vids about this repair. I'm curious on how this ends and what the problem is with this thing.
First, I would check the transistors again, and continue from there.
Good luck!
Good job Sorin I learned a lot from you
You are very genius man
wow that solder joint ..looks perfect to me...and i have done a lot of soldering in my life....wow ..you wouldnt expect that..i expected broken track.
You are the greatest of them all ..Thank you so much for all your videos ...
Tks for sharing .. i wish i had ur patience ..
i look forward to next video..because no matter what the rail must be all same voltage or there is broken track or bad joint...now the chip current is high ....but op amp reads reference voltage ...maybe the other side of op amp circuit is damaged....i dont know ..nice to see next vid...i think the d on the end of chip means it is DUAL...SO MAYBE WRONG CHIP.
Coincidences can be a bugger. Just watching 2.20. Guna be a short video. 43 mins it seems. Will watch it all and learn something. I genuinely mean that. love you Sorin and liked before watching ;)
Fasinating as Allways...
Hey Sorin, if you are going to change your multimeter and need it to have it connected via USB, check the UNI-T UT61E.
Must remember this one if I have my car oil changed, up go back next day and say the wipers need changing too under warranty
If you took your car in for an oil change and the instrument cluster dummy light indicates it has low oil the next day would you no take it back? This isn't an unrelated thing like oil and wiper blades.
Sorin did the right thing taking it back on to assess the issue. He can now assess and determine if this new repair falls under that warranty and act accordingly.
It's your fault Sorin!!! Why didnt come to Besiktas...but you deserve more viewers...
Sorin what is going on. Never saw you struggling so much bye now. Don’t focus too much on one point.
I now you can fix it and you will.
And don’t let you get down under the pressure from the people who never share their work on the internet to give us something to learn from.
Waiting for next part. This is interesting.
The second solder point from the diode, the right next to the resistor what you soldered. It looks also crap.
The 4558 is a common op amp, i'm supprised you don't have one on an amplifier board or similar.
great vid, no editing nothing, honest video, you will fix this like the old vid where you burned the superiochip😅
im with you man
That brown looking glue can go conductive over time, if it's touching the pins of sensitive components it causes problems.
15:51 LOL your humor is awesome
Hellow dear Sorin, is that a push pool arrangement?
I think it is just a soldering problem. Try to remove the old solder, clean it, resolder. Check the continuty between thoes pins and see
Love the video!!!!!!!
More subwoofer repair videos please... 😁
This Sorin is funny man...
desolder the chip and see if you have -15 volts after the resistor. maybe the zenner is also dead...
of course;
Sorin please make a tutorial about ham radio like a receiver or transceiver building.
fragile solder joint is evil😈, sometimes cant be seen(bga chips).
Don’t want to teach you how to such eggs but! Use a socket, check zener voltages before inserting IC. IC driven output stages are notoriously difficult to sort as isolation of sections is hard to achieve. Absence of circuit diagram is an issue and the protection scheme seems very unusual. I look forward to progress. Best of luck.
I have seen this kind of fault a radio. The radio didnt have any radio station. The main frequansy coil's one of leg has open curcuit. The proplem sold one minute but to findig problem was 2 hours 😂
Getting 45V on the speaker output indicates to me that some major short or wrong routing of connecting wires has occurred. If I previously had changed a relay I would suspect that the two relays were not routed the same way.
Always take the IMEI or serial number on a device like this to make sure they're not bringing back different devices that look the same claiming warranty
missed this one
Stanley Nse How can I fix prepaid meter keypad
Maybe the resistor was shorting intermittently and the voltage spikes killed the chip. .?
resistors cannot short, only open
@@josepeixoto3384 not all the time lol. I had one that burnt but would momentarily close and open from the heat. It was cracked in half somehow but drivin me nuts tryin too Find it lol
You should think at first- why pin of relay has been melted? What current was then and what this was consequence.
It could be problem with op amp oscillation. Try find issue on oscilloscope.
maybe the customer speakers are shorted.
Sorin u from Transilvania?
the owner should brought the tow speakers with the amp to check if they are faulty or not maybe they are the case
thank sr
You also have a bad cap on that filter circuit
I thought you would replace the whole thing by a some kind of regulator to produce the -15v.
Then ,it will be a fixing? Or editing?
is it me or is one of those big caps swollen?
You are injecting positive 15 to negative rail. Lol I made mistakes too
Whats your screen capture program on pc?
probably its Open Broadcaster Software .. I guess
@@GrzegorzNowicki thanks you
We’re they using nickel solder ?. It is the worst. Very.common for that type of fault.
One more comment: Maybe Rossmann should hire him : )
rossmann is an idiot, shouting, screaming and coaching. he is so irritating, constantly bitching about apple and still repair them. must have been the worst job on the planet, to hate something but still do it hahaha, fucking idiot
it came back because u didnt test it properly i remember
Strange.... he always kind of does a patchwork work around type repair. Then things go bad surely more than not.
Personally I think it was his job as the skilled pro to find the root cause of the problem the first time, fix it, and then stand behind the repair assuring the amp doesn't die again.
Well it died again!! The customer doesn't know electronics or what components were effected to begin with. It's likely several were effected if you observe them all.
I would say it's on Sorin. Check it out thoroughly before you send it home.
u r da best😀😁
Its not your fault, its fault by customer who overloaded amplifier
No one :
No single soul :
Sorin : That perfect solder is not soldered properly
These comments are shit. Original and funny, yes but only for the original and maybe the next 1000
Thats why their using 2 phase transformer hello
Better give the money back. And tell the owner to buy a new one. You Just spent to much time and money on it.
Sometimes you have to learn the hard way if you want to stay in business.
It's a little over a dollar! That and little time and the result will be a happy customer. Just fix it and keep your customer.
If you can't fix a solid state crappy amplifier, why are you in this business?
$129 Polk audio psw10
we want to see the complete repair so please make the video with the replacement chip
man you are showing us the reality not like other chanels where the repair seems a
fairies tales and everything is repaired at first so please make the video with the replacement chip thanks
detroyed my uncles stuff XD
Looks like the OP amp died ... it happens!
Get a couple chips just in case lol
So the resistor got really hot, melted the solder away from it lol. So it was responsible for the problem lol
Big lol...
👍👍
Bad day😁
good..................
Short video and then I realize it's 43 minutes long ROFL!
2 hours in an you can get $100 Chinese amps Amazon customer is still has old pos 60min labor x2 this store is loosing ass
If you keep doing dodgy jobs, they will hunt you now and then. Fixing things is one thing and fixing it professionally is completely another thing.
why couldn't you just order a relay? its like 1$
You unfortunately didn't fix it the first time.
The pads are famous for lifting on amplifier boards Heat an more heat 10yrs later time to throw in trashcan
hahahaha i guess the relay
Wow, what a fault
30👍
a joke: man is not too equipped to repair and test amps
perfect fault :)))
Nobody’s fault 😂
popamp
I have a pair of Bowers & Wilkins CM10 speakers, which cost £4,000. If you "fixed" my amp and fried my speakers with 45V, what would you tell me? I'm rather concerned that you use secondhand parts to repair items and don't seem to buy new components. Is this common practice where you live? What country, please?
maybe 2nd time, but not 3rd time; refund $, sorry, bye bye.
If the customer wants to be an asshole after you took the time to explain to him what happened. ZORIN , show him the damn door.
The reason is you are not a good technican. These Videos are good for learning how i should Not do it...