Sam, the advice you gave me to fix my sundown 6k was absolutely spot on. I did this same fix and that amplifier has been running strong at .5 ohm for over a month now. This is a reliable fix for sure and I'm glad you found it! Thankyou!

Thank you for sharing this. It seems like it would be a good idea to swap them out every time you have the board out, even if you're not having the problem. You could probably also replace them with resistors that are 1/2 or 1/4 of the value and keep a stock look.

Thanks for the great video! I wonder if there's another way to solve this issue? I see that the IRS21844 has a shutdown feature on Pin 2 (active low). My guess is that some timing circuit is taking the chip out of shutdown too early. Perhaps you can change a value of resistor or capacitor to ensure the chip stays in shutdown longer until the PWM generator comes up. I don't know the schematic of these things so that might not be possible, but if so, it should be a more reliable way to solve the issue. Increasing current to the other circuit might work but then you loose those fuse resistors and are liable to get more damage if those regulators etc go shorted at some point. Also, I think that with component tolerance and age drift, there's no guarantee that the PWM generator power supply would always be "fast" enough in every case, even after bypassing the resistors. Would be interesting to see if you find anything useful from this angle.

Hey dude! Loving the vids! Definitely helping well learning to repair amps for myself! Keep em coming!

Very nice mod and love the in depth explanations great job Sam👍

Damn that is a good looking amp! Guts look great compared to many I've seen on your channel.

Thanks! I was going to say something about the current but you answered it. Well done.

I know nothing about circuits but this was riveting.

Most half bridge MOSFET driver chips are incapable of turning the low side and high side on at the same time. A glitch like that shouldn't do any more than cause that audible start up thump in the speaker, because it would turn on one MOSFET for a few microseconds, leaving the other one off. The only way I could imagine a "shoot through", the technical term for simultaneous conduction of both transistors, would be if the high side and the low side are driven from different driver chips, and both chips being "ON" at the same time, because of a phase inverting glitch. Do these driver chips have independent inputs for the high side and the low side? If so, very rare. I would use drivers with a single input from the PWM.

@barevids

5 жыл бұрын

The issue presented here is not that, though. If you probe the +5 and -5 VCC voltages going into the driver board for the opamps generating PWM, you can see voltage drop as they build, about half way up, which delays the opamps activating. in the mean time the +12v vcc for the drive ICs is already present. The exact issue is actually that the +5v has more voltage drop due to other devices on the board making use of it and less of the -5v. This causes the opamps to receive -5v VCC a fraction of a second before +5v VCC and a tiny bump of negative current is sent down the PWM output into the drive ICs, which are active, and relay that to the fets. An audible "snap" is heard from the output section and a big spike on the fet outputs, and the rail voltage dips down, showing current has been drawn by the output fets as a whole. Repeat this many times and the fets heat up, showing they are under stress from this incident. Keep repeating it still, and the fets will explode. I have this scenario captured on video exactly as I state, in one of my livestreams on a sundown 6K. You can see and hear the stress the glitch causes to the output fets, and then suddenly BANG in my face. Jumping over the limiting resistors completely cleared up the problem and the amp has been running for a good year or so daily. Other techs I have spoken to have experienced the same and confirmed the fix resolves. :)

Dude you are friken AWESOME! If I ever need services I'm gonna ship my stuff to Australia!

@barevids

5 жыл бұрын

Thanks man! why you gonna ship it to Aus lol!? I'm in the UK!

@josmith213

5 жыл бұрын

@@barevids why did I think you were aus?

@barevids

5 жыл бұрын

@@josmith213 dunno, I did visit aus recently to do some repairs tho lol made a whole video series about it

@josmith213

5 жыл бұрын

@@barevids I think that's why, it was titled the streets of something and that's probably why that I'm thinking you're in Australia

@robg8729

3 жыл бұрын

@@barevids I would like to ship you a few amps to repair. Is that possible? Thinking not because you are a genius rockstar and most likely swamped to the eyeballs. Thanks!

Some years ago i used to repair car amplifiers.The class D large amplifier most of the times in the control pcb have the critical IC components scratched and is not visible their values.

@jessihawkins9116

Жыл бұрын

that’s not fair 😩

What you say about the resistors on the regulators Vin makes sense. However, I think that these resistors serve as a kind of circuit protection for overcurrent. They function as the weakest component in the circuit. Isn't it a better idea to replace these resistors with a slow blow through hole fuse instead?

Another great video. Thanks for sharing.

Thanks for knowing what I didn’t and telling me so! 🙏🏾👍🏾

Great video, But why so many used transistors on the bench ? I keep getting notification of new content on the channel but no videos, any idea why ?.

Man you really know your stuff!. Too bad it would cost FAR more to send you my amp then it would to just replace it, or I would in a second.

@jessihawkins9116

Жыл бұрын

why don’t you learn how to fix it yourself?…

Nice vid man awsome looking amp

Very very informative video. thank you!

You said has this been interesting? Hell yes it was!! Holy crap dude you’re damn smart, I just learned wtf that bump is I’ve heard that little turd in many of my friends systems. What a trip!!! Can you please download knowledge here…..😂

Very nice! That helps a lot with an amp im rebuilding.

Wondering if those input resistors to the 5v regulators where there to give a sight drop and ensure the Vin max to the regulators is not exceeded.

wonderful discovery bro, great remedy. Problem solver.

hey bud can u do a video on identifying what type of crossover your amp has weather is be butterworth or linkwitz riley

Hi and will start by thanking you for all the great videos ! I was hoping if you could tell me if you have ever covered verifying that earlier stages/transistors are OK when you have failed output transistors. If not would it be possible for you to cover this subject use bare bones equipment (like me ) and what to look out for as to save yourself another run to the electronics shop .Thanks again Ron (Fremantle downunder)

Awesome explanation

So I bought the DD m1 worked awesome, picked up the dm 2500, was running at 1 ohm , on 4 dual 2 DD 615s, gets hot after a few minutes, protects voltage is good, ohm correct 0 gauge OFC dual, inputs, amp has 3/4 in space underneath for airflow, dropped down to 2 ohm with only 2 subs same result, I'm super confused, on side note this amp was used....

Hey sam quick question. What are the top five amps on the market currently. Would luv to hear your honest opinion on some of them. By top 5 i mean power output , quailty components, efficency ect. Jus had to ask being that ur more knowledgeable on what makes great amp or are they all generic . since u work n repair them.😉

If you want it to be fused you could use a couple of zero ohm resistors in place of the two you bypassed.

@wilsonrawlin8547

Жыл бұрын

The wire is "0 ohm".

Hi, I was trying to solve a ground noise issue on a small new pioneer class d amp and I found the source of the noise rca line input, I tried grounding the the negative side and the amp now no longer powers up ☹️ I am not using a remote power on and the cars factory head unit with no rca outputs. Using the supplied speaker level rca converters. Any ideas? Pioneer DM-D8704 100w RMS x 4 (was only using the A channel at the time) no fuses blown on amp or the power cable

What is the capacitance and the voltage of the capacitor near the diode on the driver board?

Hi Sam (I believe that's your name..), I want to build a T-line for home use using a compo I have laying around. While doing some research on it, I stumbled upon your video from 2013. (nice hair.. :P ) What's the typical Fs for a 6.5" and should I tune the port to that freq? Can I go lower and if so, to what extend. The only info I have on the compo is that it's a power acoustic SL-6C 75w rms. I'll be driving them with a Precision Power PPI-2075AM on a alpine CDA-9855R. Hopefully the T-line has the same quality as the other two. I really like your vids by the way. Maybe funny to hear but in some way I find them relaxing to watch. Frank

i need to get a few of those blue pots for volume control is there a preferred brand?? or one i should avoid

For some reason. I cant find how to messege you through you tube barevids? I have a question about an amp that i have. Everything comes on, when i hook the speaker up to it, it pushes the speaker all the way out. If i hook the speaker wires up bridged, it sucks the speaker in all the way? Its a old crunch amp, power one x2200. Any input is helpful. Thanks.

Hi! Lovin your repair jobs. Been learning a lot from it. I got a project on my own. Is there any chance to chat with you about some questions that I got? Got 2 GAS Competition 3500.1D that I have as a learning project.

It'sreally strange a circuit drawing relatively low current would have a timing issue from a resistor with such a low impedance. Is that entire driver card supplied through those resistors?

Do you have a component list for the ext-3000d/hifonic/e-audio controller board? I had a link in an old laptop that died before I had a chance to backup.🤯 I have a half dozen e-audio e3000d to fix. fets broke from board flex. Chances that at least one would have fed back and popped the controller.

killer work!

hi whats your opinion on micon capacitors? i just bought a memphis audio prxa1500.1 amp and had an itch to peek whats inside. it comes with 4 micon 105°c 2200ųf

Need help i have an orion hcca d5000 rev A that is missing compnets.c255 and d209 can any help.

Does the DC 1.2K share the same pwm drive bottleneck? Asking for a friend😉

Awesome vid

Beast. Now the amplifier turns on the CD player first. And then the amp.

I've got a Fosgate amplifier that I let a friend use I think it's the mosfets honestly I know it's the most feds there's several of them that is just blue Plum out I was just wondering if you could help me diagnose getting it cut back on I think the ground and hot touched each other I don't know for a fact but it's not good and I am really trying to repair this amplifier because it cost a lot of money and I do not have the money to get it fixed but I do have a soldering gun and Common Sense thanks and have a blessed day

Mr Vids, I have an old very reliable Rockford Power 551x. It works but I opened the amp and the caps are swollen so It needs four new caps (Lelon 3300uf 50v ce85° h323) I cannot find these caps and am not sure what to look for.. Would you have any recommendations on replacement caps and what type these are? Thank you in advance for any input and thank you for your amazing videos :-)

@pliedtka

5 жыл бұрын

You could get Panasonic, Nichicon or similar quality brand, 105 deg Celsius caps that withstand higher temp that are used in PC power supplies. Don't get just regular caps, they have to be designed for switching power supply. Other than that what brand you choose doesn't really matter.

@ostube6035

5 жыл бұрын

pliedtka thank you. :-)

Hello Barevids i have question about bridging amps. How can i bridge 4ch amp to a mono? Have amp with bridging switch 4/3/2 Can i use input rca inverted or better to solder the signal inverter?

@barevids

5 жыл бұрын

No you can't eat 1 channel from 4. You can only cut channel number in half with bridging. 2 to 1, 4 to 2, etc.

I am repairing a DC7.5 of the same system. Only the power supply part was shorted, so I replaced the FET, buffer transistor, and drive IC. It seemed to work fine and there was no problem with the sound output, but it would short circuit when the remote was turned off. What could be the cause? SCV-6000D is also malfunctioning with the same symptoms.

@barevids

4 ай бұрын

Two issues for this. 1) drive circuit fault 2) fake Mosfets used. If you bought your fets from eBay, Amazon, Ali express etc then this is why.

@user-eg9pr4js8s

4 ай бұрын

@@barevids I reordered the fet from Mouser and installed it and it worked fine. Thank you. However, there seemed to be some DC leakage from the preamp... Could the opamp be bad?

What amps have this same problem?

the resistors are there to protect the circuit if the regs go short and try to pass full voltage

@robertcalkjr.8325

5 жыл бұрын

Might be better to use PTC Resettable fuses than just wires.

@T2D.SteveArcs

5 жыл бұрын

@@robertcalkjr.8325 yeah or hold chip off with rc on enable pin until oscillator gets going ...

@T2D.SteveArcs

5 жыл бұрын

@@robertcalkjr.8325 as Agent24 says a resistor from vcc to pin 2 then a cap from pin 2 to ground will give a turn on delay on driver chip and time for pwm oscillator to get up and running....

I forgot remote wire and it was turned on without speakers connected and without rca, and it went protect... Can you help please???

Good video friend, I have a question I hope you can help me I have an Earthquake PHS8000.1 and the power source is burned, it's 16 mosfet transistor, not good any reference number or something to be able to look for the replacement just train something that says H1, could you help me know what the replacement is, or where I can look for information, thank you very much

@barevids

10 ай бұрын

Irf1405

excelent video

I have watched many of your videos with great interest which comes down to you. I wonder if you can tell me what mosfets to use in an Edge Xtreme EDX1800.2FD Q21 and Q22. All they have on them is H9. The gets on the power side have H1 stamped on them but they have a faintly etched number on them. The H9 which I assume is not the power side. Both of the IRS drivers have also blown so I will replace them. If you would like me to send you an image of the amp, will you send me your email to send it to. Thank you. Dennis

@barevids

5 ай бұрын

Hi Dennis. Use irfb4227.

@dennismclellan558

5 ай бұрын

Fabulous. Thank you kindly. You make video which are captivating. Rock on.

Very interesting

I have a 2003 Earthquake class A/B 700 watt amp that pops when I turn it on

I've come across voltage regulator circuits like that in other things. Sometimes those resistors are put in series with the regulator if there's a huge differential in input versus output voltage possibly as an attempt to reduce heat generation because the voltage regulators are linear operation. Other times I've seen them used if there is massive amounts of stabilizing capacitance on the output and there needs to be current limiting so the initial Cap. charge current doesn't exceed the capability of the regulator. I don't believe either is the case in that particular regulation circuit and you're 100% correct. They don't really need to be there. Thanks for the tip! :)

How can I send you my product I need my amplifier repair

I wanna see a barevids - buildzoid crossover episode. They can rant back and forth about mosfets and the similarities and differences between their use in motherboards and amplifiers lol. And I like that they're both giving technical explanations on Williston/OSS and Gamers Nexus. Us normies can get in depth explanations without it always going so long and in depth that our eyes glaze over.

@barevids hey man got this alpine mrp-m2000 from a tag sale wasnt working at all was missing parts and looked like someone was soin some crappy work i replaced the missing parts and now the amp powers on with nothing more than a ground and 12 volts on the remote with no power connected to the positive lead, its hard to find diagrams and took me weeks to find the parts, anyideas whats wrong? I would love to ship it to ya but im in the u.s. idk how much it would be plus however more to repair, hit me up on my inbox i couldnt find yours

@barevids

4 жыл бұрын

That's normal most amps will give a blue light with remote and no power.

@D1aNdOnLyNiCkx3

4 жыл бұрын

@@barevids no sound tho

I wasn't sure how else to ask this and hope you can help but a friend of mine let me borrow his Arc Audio KS1000.1. It worked great until it randomly stopped working but was flashing a code with its red and green leds. I would like to get it repaired for him. Would you be interested?

@barevids

5 жыл бұрын

Are you in the UK?

@brandidan-the-car-man3521

5 жыл бұрын

@@barevids No I'm from USA unfortunately lol.

@barevids

5 жыл бұрын

@@brandidan-the-car-man3521 no way I can repair it then bro

@brandidan-the-car-man3521

5 жыл бұрын

@@barevids No worries I'm sure I can find him a replacement. I love watching your videos ! I learn so much from them !!

Where are you from???

ey y cant repair a planet audio rdx 2400

ahhh 360p. im early this time

hey Sam, I messaged you on your Facebook, I have some questions about my amps. thanks.

Dude. Your a fucking genius. Should be working for sundown or something man. Design these things

Impressive !

Hey buddy do you have an email i can reach you at i have something i would like to send you pictures off

.

Can you adopt me?