As someone still learning, I appreciate the quicker format. I don’t feel so overwhelmed with knowledge. Then when I’m ready to dive deeper, it’s good to know the longer format will still be available. Much love and many thanks from Dayton Ohio USA!
I absolutely love this kind of content. This guy def knows how to convert technical information into a digestive visual conversion for understanding. Amazing job!
Dude ... we just love your content ... your jokes the knowledge your passing on.... your amazing man I don't care how long or short the video is I'm watching
I keep telling him! The man could turn rain clouds into a sunny tornado! Not gonna lie. If the Sun is shining in Portland Oregon? Barevids DID THAT! LOL!
WOW, SUCH A VERY GOOD AND VERY INFORMATIVE VIDEO BRO, KEEP THAT UP, YOU NEVER KNOW HOW, OR WHO YOUR VIDEOS MAY HELP, YOU ALSO MAY NOT REALIZE JUST HOW IMPORTANT YOUR KNOWLEDGE MAY BE! THANKS ALOT!
Love the short format but don't stop the streams - great sense of community and interaction in those = perhaps chop them into short format videos after the stream
I have always been fascinated with electronics and especially car audio equipment. I really appreciate that you go into such detail about what is going on with each and every capacitor and resistor as well as anything else that you believe is the problem with the amplifier. What would you suggest buying for someone such as myself that would like to start building up the equipment to do what you do ?
Interesting video! I've seen board flexing do weird things with bad components. Your video reminded me to check the components in a video processing oscillator (2 mhz) for bad caps and resistors! Heating the oscillator IC did change the frequency and flexing the board made it go absolutely nuts; but I don't know that it wasn't one of the external oscillator components close by. So I'll check. Thank you!
Ok I am a 50 yo old school Radio Shack employee from the 80's I spent way too much time exploding RS electronics, and probably had impact on the demise of the company. LOVE the perfect CB flex description of "wooohh, whooh" Also props for the spot on poof and pop description. I popped that thumbs up and poped the bell Plus LOVE the Audison. WANT
love your vids n new to channel.can anyone just send your amplifier to you for repair?I'm from Brooklyn NY n out here they don't show love for what they do like you do all they care about is money so I would rather prefer to send my amplifiers away to get repaired the right way and not worry about whether or not I'm going to screwed over on the job well done.
I'm new to watching you, but I must say I really enjoy it, your accent to layman's knowledge. I'm getting back into car audio due to poor installation in my vehicle, hence cutting wiring when could've used harness adapter. which is to this,I purchased a deaf bonce aab 1000.2, straight out of the box all lights flashing with just power, ground and remote hooked up, an piss poor customer service for return, think something similar to the audison issue ??
Thanks buddy! All lights flashing is health check mode, after a few seconds it should either come on, or display one or two leds to signify a failure, what happens and what supply are you using to power up?
I'm seeing this late so I hope you read this @barevids I might have a tip for you from an old repair tech my father worked with about 10 yrs ago. I'll spare the full story, but he found an easy way to repair surface mount solder issues. Stick the board in the Oven at just high enough heat to melt the solder. The components won't be damaged at those Temps, and the solder won't run when it's just barely melting. He could repair half a dozen printer boards an hour that way! Looks as though that amp could use an Oven Spa treatment to reseal ALL of its solder joints. I don't recall the Temps he was using but I'm confident you already know that info. I did Audio/Visual install work so I know enough about soldering but never needed more than the basics, and I never did board work.
Some of the 2011 MacBook Pro laptops had wave solder issues. I was told to remove and bake the board on low in my oven to get the smd components back bonded to the solder traces. Baked for about twenty minutes, skeptical of this process while waiting, let it completely cool reinstalled the board and bam it fired up. Worked for another 5 yrs before I retired it.
@@PopRocksClassicFunkRapSoulHQ iMac video boards from that era had a similar issue, and a similar fix - but it didn't last 5 yrs. I think Apple changed the solder recipe at some point, and the problems went away.
something tells me it is possible for a fet failure to destroy the pwm chip by a short to the gate then it fries the gate driver witch shorts back up the line to the pwm chip. the only thing i think that can stop a cascade failure like that is a gate transformer as the signal is isolated so you would blow the winding before it can short to the pwm chip manufacturers could cut their costs by doing a walmart working their employees off the clock. as soon as they punch out they go oh we need you to clean the bathroom sink. go back to using lead solder and just put a warning in the product for you to recycle it rather than to landfill it and take a page from car batteries where there is a core charge to encourage returning of old stuff. and set up a cap and trade system to allow the use of lead solder.
When the fet dies and sends 12v to the drivers, the PNP driver sends the 12v from the shorted fets to ground burning the driver up. The 12v never makes its way to the 494 and even if it does, there are very high value resistors in series with the drivers that don't allow enough energy to hit pins 9 and 10 of the 494. I've never seen the pwm Gen circuit damaged when the PS fets fail
I can attest to the loud pop they make when you short out the HV rails. One of the ground clips for my scope looks like it touched off on a welder. Surprisingly the scope and amplifier survived the ordeal of me forgetting what was clipped to what.
What brand flux you use here, and if you can send a link to where you buy it. BTW is it stable with the hot air gun, some flux i use just liqify and run away or dried up under the heat gun.
So withe the powersuply blowing up "not a loud pop lots of heat smoke instantly" what does that internally? Like i had plugged it into a power suply and it triped the circuit shuting it off not blowing it. But then plug it to a 12vt car batt and instantly it poped in smoke. What makes that happen? As to this amp had the brand new smell and everything looked sexy but obvs wasnt the case aha. And if my power suply side died would that have caused mosfets to die as well? Is it worth keeping and fixi g up or is it all gunna be toast?
Multi-Layer Caps don't like being banged around much. Anytime you see an oscillator act like this in something like a car, replace the MLC controlling it, the cap is likely cracked on the inside.
Had an amp pop so loud it was like a gun shot 1 of the small caps had burst literally vaporised only the outer can left and dust cleaned the board put a match rated cap in and amp worked fine for 8 yrs after
It's not A/C switching , in the power supply it a DC TO DC converter which makes a pulsating DC wave above ground reference. The frequency t increases and decreases ) creates the duty cycle based on the load on the output voltage of the transformer
You know what I mean. It's just easier to say. Technically the current is "alternating" direction to allow for the primary to work and energise the secondary.
Why didnt you measure the cap, make a note and see if its dependent on resistor theres a trend of calculated value thats consistent based on various amp design?
How does one determine the capacitor value of unmarked SMD capacitors? My DMM has never been able to give me a consistent value when measuring them out of curcuit.
hopes and prayers, my friend! A good capacitance / ESR meter should do it. I can measure them with mine, when I dont drop them on the floor and lose them.
They need to bring lead solder back. As long as we don't breath it or eat it we are fine. The new solder is unreliable. Question. Can you get into trouble repairing Rohs solder with 63/37 tin/lead solder?
@Barevids or Anyone, curious on opinions of Seismic Audio amps. I'm looking to buy their SA 250.4LH its a Class D 4 channel amp. With really nice crossovers and four 35amp fuses(140amps total) on the board. Its rated 375 watts RMS per channel but I figure its probably closer to 350. If anyone has a Seismic Audio amp love or hate story lmk. If you got an opinion on them lmk I'm curious. It looks like a solid amp.
Been soldering for over 30yrs. PCBs, cable components, etc. I HATE Lead free solder. Unreliable to perform consistently even with consistent soldering techniques and temps. I refuse to use it unless the customer insisted and accepted the fail risk.
Yeah lead free solder sucks. I get that it is an environmental and health concern but people aren't going to be chewing on amp boards. If they are then we have bigger problems then a little bit of leaded solder.
As someone still learning, I appreciate the quicker format. I don’t feel so overwhelmed with knowledge. Then when I’m ready to dive deeper, it’s good to know the longer format will still be available. Much love and many thanks from Dayton Ohio USA!
The learning never ever stops until you quit .
X2 with love for this guy from Newark Ohio!!
I absolutely love this kind of content. This guy def knows how to convert technical information into a digestive visual conversion for understanding.
Amazing job!
Dude ... we just love your content ... your jokes the knowledge your passing on.... your amazing man I don't care how long or short the video is I'm watching
I keep telling him! The man could turn rain clouds into a sunny tornado! Not gonna lie. If the Sun is shining in Portland Oregon? Barevids DID THAT! LOL!
I have fixed hundreds of car amps back in the day and even built a few for fun but this was a new one for me. Nice catch on the freq problem! 8~D
Excellent job, I understand how the power supply works a little better now. Thankyou sir
WOW, SUCH A VERY GOOD AND VERY INFORMATIVE VIDEO BRO, KEEP THAT UP, YOU NEVER KNOW HOW, OR WHO YOUR VIDEOS MAY HELP, YOU ALSO MAY NOT REALIZE JUST HOW IMPORTANT YOUR KNOWLEDGE MAY BE! THANKS ALOT!
Love the short format but don't stop the streams - great sense of community and interaction in those = perhaps chop them into short format videos after the stream
I have always been fascinated with electronics and especially car audio equipment. I really appreciate that you go into such detail about what is going on with each and every capacitor and resistor as well as anything else that you believe is the problem with the amplifier. What would you suggest buying for someone such as myself that would like to start building up the equipment to do what you do ?
I'll have a video on this soonish ☺
Sam I like the full live videos but like the shorter edited versions also with the shorter edited versions im able to watch and learn much more.
i bet there is no one else that repairs amps so intresting.. good...knows what he's doing..then this guy... big power up💪👌 el maestro.. greats fr 🇦🇼
Great info, great diagnostics, shame about the soldering iron!
Weller WSP 80 s/iron + PU81 PSU is the way to go.
Interesting video! I've seen board flexing do weird things with bad components. Your video reminded me to check the components in a video processing oscillator (2 mhz) for bad caps and resistors! Heating the oscillator IC did change the frequency and flexing the board made it go absolutely nuts; but I don't know that it wasn't one of the external oscillator components close by. So I'll check. Thank you!
First video I've had recommended from your channel, what a strange failure mode and very interesting!
Sam is the #1 amp guy
Ok I am a 50 yo old school Radio Shack employee from the 80's
I spent way too much time exploding RS electronics, and probably had impact on the demise of the company.
LOVE the perfect CB flex description of "wooohh, whooh"
Also props for the spot on poof and pop description.
I popped that thumbs up and poped the bell
Plus LOVE the Audison. WANT
You've made my day buddy!
Great job Sam very educational keep up the good work Sir nuff respect 👍🇯🇲 🇺🇸
Watching on my xbox, commenting on my tab. Love your vids!
This is the first video I've seen of yours and its a very good video but I thought I had my video on 2x speed 🤣
love your vids n new to channel.can anyone just send your amplifier to you for repair?I'm from Brooklyn NY n out here they don't show love for what they do like you do all they care about is money so I would rather prefer to send my amplifiers away to get repaired the right way and not worry about whether or not I'm going to screwed over on the job well done.
Planned negligence, love it 😀
We need a REMIX of this. Something with the Swedish chef, the dude from Hell's Kitchen, and PhotoInduction and Friends. " POPPED IT!" 😆
love your videos Sam!
Mint Thumbnail 👌
I'm new to watching you, but I must say I really enjoy it, your accent to layman's knowledge. I'm getting back into car audio due to poor installation in my vehicle, hence cutting wiring when could've used harness adapter. which is to this,I purchased a deaf bonce aab 1000.2, straight out of the box all lights flashing with just power, ground and remote hooked up, an piss poor customer service for return, think something similar to the audison issue ??
Thanks buddy! All lights flashing is health check mode, after a few seconds it should either come on, or display one or two leds to signify a failure, what happens and what supply are you using to power up?
I learned something new . Thank you !
Man, your a freakin genius!!
What an interesting failure. I loved the small journey to the failure.
we will take whatever we can get sam :) haha i like what you do regardless of the format
Thanks for the ongoing learning, it's awesome 👍🏼
I enjoy the quicker format I've been working through the list of them
I'm seeing this late so I hope you read this @barevids I might have a tip for you from an old repair tech my father worked with about 10 yrs ago. I'll spare the full story, but he found an easy way to repair surface mount solder issues. Stick the board in the Oven at just high enough heat to melt the solder. The components won't be damaged at those Temps, and the solder won't run when it's just barely melting. He could repair half a dozen printer boards an hour that way! Looks as though that amp could use an Oven Spa treatment to reseal ALL of its solder joints.
I don't recall the Temps he was using but I'm confident you already know that info. I did Audio/Visual install work so I know enough about soldering but never needed more than the basics, and I never did board work.
Some of the 2011 MacBook Pro laptops had wave solder issues. I was told to remove and bake the board on low in my oven to get the smd components back bonded to the solder traces.
Baked for about twenty minutes, skeptical of this process while waiting, let it completely cool reinstalled the board and bam it fired up. Worked for another 5 yrs before I retired it.
@@PopRocksClassicFunkRapSoulHQ iMac video boards from that era had a similar issue, and a similar fix - but it didn't last 5 yrs. I think Apple changed the solder recipe at some point, and the problems went away.
something tells me it is possible for a fet failure to destroy the pwm chip by a short to the gate then it fries the gate driver witch shorts back up the line to the pwm chip.
the only thing i think that can stop a cascade failure like that is a gate transformer as the signal is isolated so you would blow the winding before it can short to the pwm chip
manufacturers could cut their costs by doing a walmart working their employees off the clock.
as soon as they punch out they go oh we need you to clean the bathroom sink.
go back to using lead solder and just put a warning in the product for you to recycle it rather than to landfill it and take a page from car batteries where there is a core charge to encourage returning of old stuff.
and set up a cap and trade system to allow the use of lead solder.
When the fet dies and sends 12v to the drivers, the PNP driver sends the 12v from the shorted fets to ground burning the driver up. The 12v never makes its way to the 494 and even if it does, there are very high value resistors in series with the drivers that don't allow enough energy to hit pins 9 and 10 of the 494. I've never seen the pwm Gen circuit damaged when the PS fets fail
Great video!
The gigantic solder blob on your desk under the power supply section probably isn't doing you any favors ;)
I like both the live streams and these short formats. That said I prefer the live streams
I can attest to the loud pop they make when you short out the HV rails. One of the ground clips for my scope looks like it touched off on a welder. Surprisingly the scope and amplifier survived the ordeal of me forgetting what was clipped to what.
What's your favorite solder/flux? I have some go-to's but I'm curious what yours are! Lead free solder ends up being terrible for repairs
What brand flux you use here, and if you can send a link to where you buy it. BTW is it stable with the hot air gun, some flux i use just liqify and run away or dried up under the heat gun.
So withe the powersuply blowing up "not a loud pop lots of heat smoke instantly" what does that internally? Like i had plugged it into a power suply and it triped the circuit shuting it off not blowing it. But then plug it to a 12vt car batt and instantly it poped in smoke. What makes that happen? As to this amp had the brand new smell and everything looked sexy but obvs wasnt the case aha. And if my power suply side died would that have caused mosfets to die as well? Is it worth keeping and fixi g up or is it all gunna be toast?
Multi-Layer Caps don't like being banged around much. Anytime you see an oscillator act like this in something like a car, replace the MLC controlling it, the cap is likely cracked on the inside.
Had an amp pop so loud it was like a gun shot 1 of the small caps had burst literally vaporised only the outer can left and dust cleaned the board put a match rated cap in and amp worked fine for 8 yrs after
Like this format.....
Nice work.
😎👍👍
Either or whatever you do I'm watching
And again a very informative video.
keep up the good work!! thanks alot
nice bit opf logical fault finding
Great video want to see more amp repair.
Love the sound effects lol
Quick question! I have a DD M4b works flawless but one of the tiffany RCA jacks is really finicky. Where can I find a replacement ?
RS Components, farnel, mouser, digikey etc
13:30 looking for a fraction from a second away and it jumped up to 185khz and back
I never seen a soldering job with so many letter “I”.
It's not A/C switching , in the power supply it a DC TO DC converter which makes a pulsating DC wave above ground reference. The frequency t increases and decreases ) creates the duty cycle based on the load on the output voltage of the transformer
You know what I mean. It's just easier to say. Technically the current is "alternating" direction to allow for the primary to work and energise the secondary.
@@barevids misleading , but that is just my opinion LOL
When you put your thumb on that long black Chip I saw it clicking to protect mode and then when you removed your thumb the red light went off
Frequency of tl494:
Fosc = 1 / (Rt * Ct)
My sundown salt 8 just did that . What causes it
Why didnt you measure the cap, make a note and see if its dependent on resistor theres a trend of calculated value thats consistent based on various amp design?
me: 118kHz? that's quite low
Sam: absolutely preposterously large
me: wait.. what?
*as a context, i ran my prototype supply board at 250kHz
haha! yeah man, it would definitely be nice to see some higher switch freqs on these kind of amps.
I had an old kenwood amp do this. I thought the transformer was cooked at first.
i like this style better feel like i can take in the knowledge better.
Commonly would be transistor failure that would have blown the fuse or any short circuits on the logic side
How does one determine the capacitor value of unmarked SMD capacitors?
My DMM has never been able to give me a consistent value when measuring them out of curcuit.
hopes and prayers, my friend!
A good capacitance / ESR meter should do it. I can measure them with mine, when I dont drop them on the floor and lose them.
They need to bring lead solder back. As long as we don't breath it or eat it we are fine. The new solder is unreliable.
Question. Can you get into trouble repairing Rohs solder with 63/37 tin/lead solder?
Go to a different store.
Can I have info I need some amplifier fixed
On overclocking PC motherboards it's not uncommon to be able to choose up to 500khz switching frequency in bios.
what is your pricing estimated on reparing an amp
Cheers
Like it a lot!
Are you related to Photoinduction? You both sound the same :D
I has one of those. Goodampers
I think mine might be the srx but ya they sound great. Expensive as shit.
👌🏾
@Barevids or Anyone, curious on opinions of Seismic Audio amps. I'm looking to buy their SA 250.4LH its a Class D 4 channel amp. With really nice crossovers and four 35amp fuses(140amps total) on the board. Its rated 375 watts RMS per channel but I figure its probably closer to 350. If anyone has a Seismic Audio amp love or hate story lmk. If you got an opinion on them lmk I'm curious. It looks like a solid amp.
Seismic audio is a up and comming brand they do rated power on the qmps.
Been soldering for over 30yrs. PCBs, cable components, etc. I HATE Lead free solder. Unreliable to perform consistently even with consistent soldering techniques and temps. I refuse to use it unless the customer insisted and accepted the fail risk.
Early....
For moment I thought you a red bra on 😂😂
Longer!!!!!!!!!!!!!!!
Yeah lead free solder sucks. I get that it is an environmental and health concern but people aren't going to be chewing on amp boards. If they are then we have bigger problems then a little bit of leaded solder.
If you try to drive a tranny to fast, it will simply stay on. The driver may have made a shorted h-bridge by failing that way.