Hi Richard, just a big thumbs-up from me on your very methodical walkthrough on your style of fault-finding and diagnosis. For an old hand like me, I find your videos highly therapeutic, and every now and then I still learn new trick from you. As somebody that also educated beginners, I view your approach so calm and educational for a beginner, walking them step-by-step through your thought process…. Wish more of those electronics you-tubers would follow your process. Every decision you make is rational and well thought out. Ok, ok, there are sometimes that I would have followed a different approach, but hey, uor brains are different after all…. For example, I use an oscilloscope a lot more, even for measuring supply-rails. With modern scopes, you can measure voltage accurately enough and see potential problems (ripple, oscillations) with one measurement, but that is not a criticism, just showing a different approach. Showing people how to look at new thing, deduce how it works, drawing rough schematics to figure out how it SHOULD work, instead of just guessing blindly is a huge skill that beginners should get acquainted to, and I think you are an exemplary example of educating people how to do methodotical fault-finding.👍👍👍 BTW. I think you need to get some high-power 8-ohm resistors to test the amps with, instead of a speaker 😄
Agreed, we all have different approaches, heck I even may take a different approach myself on any given day. Yeah I talk about dummy loads in part two, coming tomorrow
okay, let's continue with this repair... This type of amplifier that is mounted in the back of many brands of subwoofers,.... probably has similar techniques for diagnosing the problem, I would suspect that on average a common repair has to do with the output stages... From being overdriven but that's just speculation on me... But because this is a learning channel going through the process of diagnosing and explaining the circuitry is going to be a great learning experience and if we get the opportunity to repair all three who knows what we can learn.
Wow. You really have sharp eyes there! I had to watch it a couple of times before I saw it. When the unit is switched on for the second time without the current limit, there's a whisp of smoke that can be seen between the 2 video inserts on the right hand side.
Heya, I only saw the smoke after reading the comment and still had to look twice to see it. love to see these kinds of repair. curios how that repaired speaker is gone sound like. what time the upload will be plus/minus.
These plate amps are a pain and have floating grounds. Sometimes primary and secondary ground. Plus no discharge resistors. Also, I dont think that amp is class d. Those old style, linear power supply amps are pretty straight forward.
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*Part two recorded and coming tomorrow* 😉
Hi Richard, just a big thumbs-up from me on your very methodical walkthrough on your style of fault-finding and diagnosis. For an old hand like me, I find your videos highly therapeutic, and every now and then I still learn new trick from you. As somebody that also educated beginners, I view your approach so calm and educational for a beginner, walking them step-by-step through your thought process…. Wish more of those electronics you-tubers would follow your process. Every decision you make is rational and well thought out. Ok, ok, there are sometimes that I would have followed a different approach, but hey, uor brains are different after all…. For example, I use an oscilloscope a lot more, even for measuring supply-rails. With modern scopes, you can measure voltage accurately enough and see potential problems (ripple, oscillations) with one measurement, but that is not a criticism, just showing a different approach. Showing people how to look at new thing, deduce how it works, drawing rough schematics to figure out how it SHOULD work, instead of just guessing blindly is a huge skill that beginners should get acquainted to, and I think you are an exemplary example of educating people how to do methodotical fault-finding.👍👍👍
BTW. I think you need to get some high-power 8-ohm resistors to test the amps with, instead of a speaker 😄
Agreed, we all have different approaches, heck I even may take a different approach myself on any given day. Yeah I talk about dummy loads in part two, coming tomorrow
I saw some smoke as well at around 36:00.
Smoke when you took it off the current limiter at 34:30 - just above the inset image of the bulb
Very interesting video Mr. Richard thanks!
okay, let's continue with this repair... This type of amplifier that is mounted in the back of many brands of subwoofers,.... probably has similar techniques for diagnosing the problem, I would suspect that on average a common repair has to do with the output stages... From being overdriven but that's just speculation on me... But because this is a learning channel going through the process of diagnosing and explaining the circuitry is going to be a great learning experience and if we get the opportunity to repair all three who knows what we can learn.
36:20 some smoke on the right side there
Wow. You really have sharp eyes there! I had to watch it a couple of times before I saw it. When the unit is switched on for the second time without the current limit, there's a whisp of smoke that can be seen between the 2 video inserts on the right hand side.
That's where a couple TO-92's are. One of them was bent over at the time, was originally straight up and down.
@@pault6533 All will be clear in part two which is now recorded ready for tomorrow 🙂
Heya, I have good eye side but had to look twice to see it well done 👍
33:55 Richard goes off camera to change his undies 😂 Make that one into an ElectoBoom style short Richard
29:39 - Wow! I just learned a new English term - _Preexploded_
Heya, I only saw the smoke after reading the comment and still had to look twice to see it. love to see these kinds of repair. curios how that repaired speaker is gone sound like. what time the upload will be plus/minus.
Jeez Richard, I think I jumped more than you!! LOL
...same here!!
Class D amplifier repair is more important than ever!
Loving the suspense!
Nice Jump Scare...
These plate amps are a pain and have floating grounds. Sometimes primary and secondary ground. Plus no discharge resistors. Also, I dont think that amp is class d. Those old style, linear power supply amps are pretty straight forward.
Looks very much like a Class D to me
❤
Master
27:13 😍dickycad
Can I send you my electronics to be repaired? It's a 2024 Lexus LM350H headunit.