How to repair DD M4a amplifier?! Walkthrough

[@jacobleedowney]

I started watching your videos every other day at supper time, and last night I fixed a very dear amplifier. It's a Jensen 400w 4 chan (600w 2 chan bridged, 40 amp fuse); that has been an alternate in 5 of my cars, and 4 of my family member's cars. #ThankYou

[@barevids]

Awesome!

[@Mkvy]

It was a hot day when it popped and playing for a few hours, looking forward to collecting it on Wednesday , cheers for the video and the repair !:)

[@ceciljones1248]

I bet that wasn't cheap to repair?

[@sophiebandit5625]

Hey Man, It is so nice to watch a Tech that doesn't screw around and down talk to people like they are children. Just show us what we need to know. l You really know your shit and I am watching more of your videos.

[@samerawaragi3041]

I admire the way you are making video. Thank you so much for sharing your knowledge.

[@pierreseaton2795]

Wow, my Ampere audio AA5000.1 circuitry looks just like this. This is a very informational video about amplifiers and how to repair them. Pretty sure that I have the confidence to do this as long as I can find the right parts in case my own amplifier ever blows.

[@gavinmcclure8047]

Love watching your channel. You inspire me to play with all my amplifiers I have laying around.

[@tonedriverss8629]

Genius . Master . Amazing . So much to learn here . Much appreciate . Much respect .

[@ΜΠΑΜΠΗΣΧ-δ2δ]

Thanks for video from Greece.,...i try to repair my amplifier now .....you are very nice

[@ramus9]

You're an amazing guy. Keep up the great work and don't stop making these videos. :)

[@jrose92081]

I have a Diamond D3 400.4 amp from 2003-2004 that just quit one day. Amp powers on does not go into protect but has no output to the speakers. No hiss or anything. The amp is extremely clean and I love it just dont wanna give up on it yet. I fix TVs but I’m just not highly educated in amplifier repair what should I check? Love the videos man you are very knowledgeable.

[@jrose92081]

UPDATE: I found a MPS A56 that is completely dead across pins 1 and 3. All the other MPS A56s on the board measure good. I thought i had no sound in the amp but holding a speaker to my ear I could barely hear music. I’m hoping I can just replace it and the amp will work. I’ll know soon enough.. if anyone has any insight please let me know. Thank you in advance!!

[@TheCarAudioGuy]

First to comment :) LOVE this dude! Learn so much from his videos!

[@waynewayne3709]

Good walk through on troubleshooting

[@stuartmp1974]

Another awesome well done, well comentated and presented repair video. Really enjoyed it. 😁

[@RoadRunnerMeep]

Love your channel, one of my favourites to follow for electronics repair. Would love to a see a small room tour how it's laid out for you as I guess you work from home. Do you get a large supply of electronics, or is it primarily MOSFET's you keep with certain values

[@CAR-AUDIO-PRO]

Great video lots of detail. Where do I find perrys guide to find part numbers?

[@monstral6331]

dude your are unbelievable!!!!! you are the best of the best!!!!!!!!

[@gahumada5284]

Oh and I also have a Taramps 15k bass that needs repair the issue with that amp is that when the radio is turned off the amp won’t shut off till I remove a specific power cable from the battery

[@pauljoey7977]

Awesome video. I thought the video was very nicely done

[@cartycartyamplifiersalesrepair]

Well done again sir great work as usual

[@picapica8806]

I used to bench test an amplifier on a server psu using a 2ohm dummy load(speaker voicecoil submerged under water i.e. electric kettle), then one day the server psu kept tripping (i thought the psu was unstable because i cranked the psu up to 13.4V- so i dropped it back to 12V), then the amp popped its 2*30A fuse so i replaced them with 2*40A(stock fuses usually popped if left long enough at clipping on 2ohm), i noticed the amp made significantly less power(AC voltage was lower at clipping this time, when its usually higher), by this point it was too late before i realised my dummy load shorted to 0.8ohm. I damaged the amp in some way because the idle current went up from 1.5A to 2.4A after the incident, the amp used to make 900W now it makes 500W while still consuming 1400W. when i inspected the amp there was visually no damage, the only component that was suspect hot was the transformer. The transformer is SMPS style, looks very easy to overheat, im not sure if its damaged, i dont know what else it could be, is it worth attempting to rewind the tranformer? Im worried that ill crack the core in the process.

[@nortoncarty3585]

Like what your doing sir keep it up am also a repair guy too from Florida

[@m0011v]

So if the voltage regulators don't show a short circuit then does that mean either they are damaged or the transformers are damaged or the traces between them?

[@LiLthirtSty]

Another Great video sam. Im always looking for that notification today just got better! #rainyday

[@alexferrieratx]

You are amazing! Thank you maestro. Definitely subscribed.

[@CAR-AUDIO-PRO]

What size are the transformers on the out put side. I need to get a replacement for one that i found shorted out? Thanks!

[@kurchak]

When you started using your scope to probe the pos and neg rails, where was your scope grounded to?

[@barevids]

Shares a ground with the 12v power supply negative through the mains. This means the ground path is quite long so there will be some minimal noise on the waveform, however when probing high voltage signals this is negligible. If I need to probe some very low voltage waveform where shape is critical I will hook up the probe ground wire to a close reference point.

[@kurchak]

@@barevids oh ok, so your benchtop DC power supply has the mains ground connected to negative then. Like shorted out at the supply terminals I'm guessing? I'm having a hard time with grounding cause so many videos say different things. I saw a lot that said it's important to have mains ground be completely isolated from the DUT and the Oscilloscope. To avoid accidentally shorting the mains. Is this just not an issue because the amp is not plugged into the mains line? Like no hot mains going through the amp? Thanks btw for the reply brother, I know you have a lot of subscribers and comments so I appreciate you taking the time to reply!

[@donbadman2165]

hey bro i need some advice on repairing a dd c5c ........ i have found the problem to be the mp2510 transistor but i cant get it to buy ....i would like to know if there is another transistor that can be substituted .... any assistance would be greatly appreciated thx .....

[@jawnwallace6182]

If at possible can you do a breakdown on a soundstream txp.1 180000d

[@mon-ti6bx]

Hello do you repair battery chargers? I have a xantrex true charge 2 TC-3024 which might need a new microprocessor board.

[@INCC74656I]

i pulled the rectifiers with out realizing they were different. i now have two pairs of fets that i dont know what side they go to on the board. how can i tell which need which side is which? i assume one is pnp and the other is npn? on my tester i see one pair have cathodes and anodes flipped 180 degrees from center. amp is a hcca5000.1 splx. i really dont want ot just guess...

[@bkrgls]

Great video! I have mad respect for your skills. I like to repair amps too but I don't do it enough to be as good as I want to be. I wish that there was a school just for amplifier repair. What's the name of that website to check for the defaced ICs? Is it Perrys guide? I typed it in but it pulled up maps. Is it something in the UK only? I'm over here in the US. I'm glad that you uploaded this video because I'm about to start on a Zeus 1800.1 and it's a big mess. I feel sorry for the poor amp because I know that it was abused...LOL! All of the PS Fets are blown open. The source legs on the majority of them are detached and the output Fets are all shorted. So I know that the drive circuits for both the PS and output stage are gonna need to be checked thoroughly. But anyways...great video. ✌

[@lionelmason22]

What is the best watt resistor to get first time working on a board my resistors area reading 18 and 22. Last video i seen with this hifonics board had 47 ohm resistors just want to get the right parts.

[@bryanhayes4897]

So, I am having an issue with an older picaso 1500 1D soundstream. bad leads on the sub shorted the terminals between the coil and the terminals so basically the wires got crossed. amp blew, now as soon as the power and ground are connected it blows fuses instantly with out the remote wire connected. i checked the fets using the method in previous videos and all but 2 are bad imo one on the power one on the output section the rest shorted. would new fets fix the issue or do i need to continue trouble shooting. parts ‎IRFB31N20DPBF-ND‎, ‎IRF1010EPBF-ND. ‎

[@boostedmk5gti563]

My m3 needs a repair one of the mosfets melted smoked but amp still works fine

[@AudioDogFlorin]

hello barevids! cand you do a litle video about the metal clamps that holds the fets,, how you get them out without damaging them i allways broke them and they are quite expensive . thank you !

[@abeleski]

how energetic are you!??? i wish i had half your energy

[@txmade4371]

Great vid!

[@m0011v]

i have an mtx amp that is stuck in protect because i was adding another amp and i accidentally wired the power inputs in reverse... it didn't damage the new amp but the one that was connected in my car won't come out of protect mode... i tested the continuity of the 12v imputes and my multimeter beeps but stays at 0.... does this mean that the problem is in the power supply side?

[@barevids]

Output fets shorted

[@m0011v]

@@barevids thx.. so if I change the output FETs then it should come out of protection?

[@barevids]

Maybe, maybe not, you may have also damaged the drive circuit.

[@m0011v]

@@barevids k thanks for the help :)

[@b.g.bvoice1142]

hey big fand ...would if you could teach us about the smps wire guages and how much amps it takes up

[@gahumada5284]

Hey chief I have a jp63 amp that I had just sent in for repairs didn’t run the amp for an entire week when it blew out again I feel like it might have been the repair wasn’t so great. Would you be able to do the repairs

[@barevids]

@@gahumada5284 I can't repair from overseas sorry bro

[@kevincampbell8298]

What thermal imaging camera were you using? I am looking at one for several purposes. Always curious as to what others use for things.

[@bartolomarietur9272]

Epic video's man love them! But I do keep wondering what the issue on my dd dmf1600 could be, I have had it at 4 different repair shops, none of them had any idea how to repair it, the issue is that it does play the sound but it doesn't look like it's amplifying, I have to put ALL the gains at max (radio and amp) to get even a little bit of sound. Hope to hear from you man, and maybe find a way to fix this issue

[@jaiaditya4u]

What other Ic's are there on these driver boards, i've seen several videos of your's. I see similar board on different brand amplifier, are these D class topology 130Khz are self osscillating type or fixed frequency generator circuits are used.

[@sahabrathore340]

How many irs21844ic used in this amp

[@Juggalokanex6]

I have a question that I hope to get help with. Never doing any repair myself, the power rail caps melted off the board (05 clarion dpx11500) but amp worked up to that point, had a second battery and fuse between batteries blew causing it to run off back battery until melting point, would putting in rail caps backwards cause it to push voltage from power inputs instead of taking it in? I think maybe manufacturer of caps put indicators of negative backwards as I put them in same as old caps and remaining caps before changing them all and made sure polarity was correct by connector wires. Or could it be something else? I would try to send it to you but cant afford shipping international.

[@monstral6331]

very nice vids. keep up the good work!!! question?? what therml compound to use at the transistors of my rockford t600.4 car amplifier???

[@barevids]

HY800 😁

[@danielmoraes9637]

great video! thankyou teacher

[@AdamSNook.]

please please can some one help me with a Phoenix Gold RX500.1 mono block the driver board as a tip42c that as a blue resister oneected to it mine is blown to bits and carnt find the colour bars i think it could be brown black black gold so could be 100 ohm or 50 ohm or 10 ohm its a metal film resister or was lol its driving me insane not knowing so if any one as this amp Phoenix Gold RX500.1 and can confirm the rester on the power driver connected to tip42c and tip41c

[@light-os4jy]

I got a power accustic amp I need to get repaired could I send it to you

[@barrasin1]

I got a Fli 1000w car amp it work fine but the sub speeker dosnt it dsorts not good bass wot can it be mate

[@johnoates3326]

Must be something with these DD DM series..I have a DD DM-2500A ive tried to repair a few times..About to throw it in the trash pretty soon..Its gotten so bad it just smokes the wires when i try to tuem it on

[@johnoates3326]

I use mine for parts now took the terminals off to repair a nemesis NA-6KM that I have in my truck..Never buy DD again for me lol

[@tiktokboss7030]

Kool this video is fantastic.

[@Electricworld-1]

hello can you make a programme about exactly how you a scope is set up. Thanks

[@stevinvillalobossalazar6212]

Hi bro. how many rms give an M3a DD amplifier

[@asianmatthew17]

I have a amp that over heated would that be the mosfit

[@f.a3202]

hey guys, could someone explain why there is negative voltage at the low side fets gates at 19:21? And where does it come from, i mean how is that created if you understand me

[@barevids]

Negative rail at lowside gate is just "ground" as far as its concerned. It comes from both the pull-down resistor between gate and source (which is connected to neg rail) and also from the drive IC lowside output which is ref to neg rail.

[@genius3258]

Hey barevids! I have two dead DLS CAD-11 amplifiers on my desk right now and Im having troubles repairing them. There is an 8 pin dip IC in the output mosfets drive circut that has numbers scraped off. I just cannot figure what that IC is. Can you possibly help me with identifying that thing is? The amplifier is basically same as soundstream tarantula TRX-1500D or planet audio VX2200. Thank you very much.

[@barevids]

It's either irs2184s, 072c or lm211 depending on the rest of the circuit. Send me a pic to my facebook page

[@genius3258]

@@barevids thank you very much for an instant response, gonna send you picture asap. There is some weird transistor array right next to the unknown Ic. I dont think that it is an opamp. Gonna look up that irs

[@tommyfalls]

What kind of driver transistors for the power supply there are 4 in a row.. On a sav sundown 3000.1d? And are they all pnp ?

[@barevids]

I can't remember if that amp uses all PNP or some npn also. Take a look at it, and if there are A and C transistors then it's npn and pnp. If you only see As, then all pnp. Use 2sb772 to replace PNP, and bd139 to replace npn.

[@tommyfalls]

@@barevids i found they take 2sa1023. Bd140 or bd136 are safe to replace yes?

[@barevids]

@@tommyfalls bd140 is fine yep

[@trigun890]

@barevids my m4a kept going into protect yesterday. I would cycle power and it would play for a bit and go back into protect. Any ideas? The amp was warm to touch.

[@cdbennett2332]

Did you figure it out? Seems like it could be a bad coil on a sub.

[@christopherj8766]

I have an M2 been working great for a couple years, but have you seen any other amps with the same boards as these?

[@leeramnarine2534]

How is the tone on this m4 compare to rockford T3000.1bd

[@mikespl4180]

This amp stomps all over a Rockford 3k at twice the power

[@MVAgusta109]

Hey buddy ! Got exact same amp works fine but pops/AC on outputs after remote is removed/ turned off ? What could this be?

[@barevids]

pops/ac? blows the fets? or makes a pop sound through the sub?

[@sandeepsinghjagdev3485]

How pwm at out driver board made???

[@rashad5286]

What output fets does this board use? Thanks!

[@barevids]

FDA24N40F

[@rashad5286]

@@barevids Thanks for the reply man!

[@lonestar3737]

What r the driver board chip part numbers? Thanks

[@barevids]

Says in the video

[@MaestrroMusic]

Can you repair my Audison 5.1k Voce please? Only 1 channel not working. 1st it was distorted, and the distortion got worst and worst, and now there is no sound on this channel. The channel is the class AB 150 rms right channel.

[@MegaWolfman76]

Just subscribed not that long ago love the videos so far. My question is I have a hf brx1600 and brx 2400 amplifiers do you know of any websites I can get getting all the parts to fix either of these amps 1600 has blown cap and 2400 needs new gets and the little black 3 connections transistors to repair any help is greatly appreciated I live in the US

[@joshhanson6777]

Mouser, there the best by far. You can get everything you need to build those two amps at mouser!

[@MegaWolfman76]

@@joshhanson6777 mouser.com

[@TommieLjungberg]

i need a transistor clamp for this amp, spl d8s or similar design. anyone know where i can get one? :)

[@iagoolinto7118]

Obrigado mano , achei que ia ter que jogar meu amplificador no lixo porque os meus cis driver estão raspado e aqui não acho nada na internet.

[@nickelwood1176]

Where can I order mosfets from?

[@degreesdegrees-jr4eg]

Hi can someone help me. ? I need a amp that can "play" from 0 - 5 hz I want to play say 0.6 hz with 500 - 1000 w on a subwoofer. (Just for the fun of it.) What amp can do that. How to make that amp? Thanks

[@TheCarAudioGuy]

Just finished the video, today I learned how a DD amp works and how it can be repaired :) cheers dude Although I have a quick question, you mentioned that it is bad to power on an amp without a load or speaker connected, I'm guilty of doing this all the time with my PDX amps while setting the gains, although I have never had anything break as of yet.... Should I avoid doing it in future? Also I have a 4 channel where only 2 channels are used... So the other two have been left disconnected for years.... Hence asking you the question

[@barevids]

Hey man! The PDX amps are very well designed to prevent this from happening. Its more of an issue on the older generic class D designs. Your 4channel is probably a class AB - they dont care about having a load or not. :)

[@TheCarAudioGuy]

Cheers for the info my man, I always did wonder the question if I was alright to leave the speakers disconnected on the PDX Your right on the PDX, they are pretty hard amps to break and I notice that they love to turn themselves down when things get hectic.... You should collab with @BigDWiz, he is great at showing the power an amp can do, but he could do with you explaining what's inside and how it works when he does the section with the amp opening up

[@tanboonkeat1040]

can i send the amp for you? what ever is cost.

[@tanboonkeat1040]

how can i send the amp to you

[@deivid7257]

Please reference of u3 tl072 and u4 ?? Lm3???

[@barevids]

211 or 311

[@deivid7257]

@@barevids thanks

[@joshhanson6777]

Thank goodness I thought you have forsaken us! Lol!

[@xxdogg2000]

have you ever worked on a hifonics pro 5k???

[@barevids]

Yep... Barely made 2k...

[@xxdogg2000]

i have one and run it at .5 ohm mono its been fine for 4 yrs and clamped at 4775 at last comp but a few weeks ago it started being dumb im lost ...it works but at low volume it works fine as i turn up i start to get into "loud volume" it goes into protect ...shut off system and start back up it work again?? but get loud and right back into protect...any ideas as what might be issue?? i also understand its hard to figure out issues without amp in front of you..

[@cdbennett2332]

Did you get it to work? Sounds like probably a bad coil on a sub

[@Assistingalways]

Now how does someone get to contact you 🥺

[@WDBRacing]

Do you repair gp3k?

[@barevids]

Yes

[@tanboonkeat1040]

sam, please help me to fix the amp

[@leopaulevans7573]

hey need to trouble a noisy channel on my car amp

[@tanboonkeat4840]

Please help me fix the ddaudio M5. I will pay the price. So how can I send the amp to you?

[@barevids]

Shipping to UK too expensive

[@tanboonkeat4840]

@@barevids how much

[@barevids]

@@tanboonkeat4840 I don't know, you get a quote and find out

[@cristianlozano5522]

Maestro Me gustaría ver otro vídeo en español 👍

[@karlmcdonnell5838]

Hey Man! been watching alot of your videos, i have a few questions regarding a class d amp im trying to repair if you wouldnt mind letting me pick your brain

[@vladnickul]

they don't use brand caps anymore in anything? that amp look really expensive.... and no elna panasonic not even the cheap nichi.... damn!

[@gustasogrande2497]

si un mosfet esta polarisado con resistencia todos marcan como malos si uno esta rotoi

[@ronaldsummers8533]

How can I reach you I need help

[@andrewlewis5251]

The 6 people who disliked are people with blown amps :P

[@tanboonkeat1040]

can i send my M5 DDaudio amplifier to you? i live in malaysia above singapore'

[@barevids]

Sadly it will cost too much to send 😔

[@tanboonkeat4840]

Please, how can I send?

[@tanboonkeat1040]

@@barevids yeah i know it cost alot but i still want to save the amp, no matter what. so how can i send it to you?

[@tanboonkeat1040]

@@barevids i will pay the cost, please where should i send?

[@barevids]

@@tanboonkeat1040 please send me a message on facebook.com/nsvaudio

[@joshuajames1067]

I got a DDM4A but its silver

[@MasterDJRenn]

Nothing like an M4a, kinda expensive though.

[@barevids]

Actually there's many amps like an m4a. Identical, in fact 😂

[@MasterDJRenn]

@@barevids Can you name a few, that M4a is $2599 if there are identical amp to that one and a bit less expensive it would be great to know.

[@barevids]

@@MasterDJRenn SPL dynamics D7, DC audio 7.5k, Sundown ns1, etc. These amp all use an identical circuit architecture with minor differences to rail voltage. Anything Korean halfbridge in this power band is the exact same circuit. Ka7500 PS pwm, 064n or 1405 PS fets push pull an array of transformers, class D circuit irs21844s drive with 24n40f output fets. If you compare guts shots you'll see they're the same, only differences being multiple smaller transformers or lesser big ones. These circuit designs are over 20 years old and it's ridiculous that they are still being churned out and marked up to such huge price tags, when you have brands like Banda building far superior amplifiers, using modern reliable drive architecture, PIC integration, lightning fast protection, modern low RDS mosfets, for a fraction of the price. The banda Viking range is hands down the best mono bass amplifier you can buy right now, and it's cheap as hell.

[@MasterDJRenn]

@@barevids This is exactly why ive been subscribed to you since forever......Ive learned more from your videos than any other place.......Thanks.....

[@MasterDJRenn]

@@barevids I had a Ampere 5K (Korean) on 2 Fi BTL neos swapped for a Taramps 15K and the bass was night and day difference, the Tramps just didn't do the low end like the Ampere 5K, I wound up putting back the Ampere and returned the 15k. I now have a Sundown SCV 7500 on 2 Fi audio teams, the question is will the Banda Viking 15k out perform the Sundown cause the Taramps 15K was just a failure. Here is my video of the Sundown kzbin.info/www/bejne/pIWanH2pqMqnZ8k

[@Real_Crunkzilla]

man I dont sub to shit, but you got my sub and bell.

[@recordingstudiotech]

Damn, just saw a blown one for sale

[@alexarif2835]

I would like to seek your advice. While I attempted to fix the Fusion car amp I found the one output pair of Mostfets damaged and changed them. I was surprised that after the “repair” the amp drew too much current and didn’t function. The power supply worked. When I tried to use my scope to trace the audio signal from the input of the Mosfet driver ICs (IRS2092S) I could really see it on pin 3 however one channel worked anyhow. I was even more puzzled when I saw high voltage and high frequency oscillation around the Mosfets. It seems to me that some component brings the overall unit into oscillation. My question, have you seen such behavior and could the IRS2092 be faulty or what is your experience ? bg{add}bgcontrol.com

[@barevids]

Hey buddy. Those drive ICs are incredibly sensitive and almost always die when a mosfet shorts. If you found shorted fets, you must replace all fets on that channel for new ones, even if some survived. Very important. You should also change the 2092 chip as this is more than likely damaged as a result of the fets shorting. Note that you will not see an audio wave on any of the pins of the mosfets, this is not how class D works. The 2092 is taking an audio signal and converting it into high and low side pulses that can drive mosfets.

[@alexarif2835]

@@barevids Hi, great insides many thanks for educating me on this class D issue I will do more research.

[@curtiswilliams4395]

i need a amp repaired can u do it for me

[@barevids]

Only if you are in the UK

[@curtiswilliams4395]

@@barevids sorry I'm not.. Dam I need my amp fixed bad

[@thomasczartoszewski6378]

Are you an engineer or technician?

[@barevids]

neither, just a random guy who self taught electronics in the back of his garage lol

[@thomasczartoszewski6378]

Good videos keep it up.

[@jijisniet]

Live chat goes here

[@gianstevens7918]

So theoretically you could bypass the power supply and transformers using these at higher voltage 😂😏🤔

[@cekpi7]

If you can provide positive and negative rail voltages, yes. It would be easier to power these from ac mains using transformer (which would step 120v up to +-150v or so)

[@tanboonkeat1040]

sir, what is your address? i'll try to send it to you.

[@ceciljones1248]

FAR as I'm concerned that amplifier shouldn't be sitting on your bench for a repair for that price it should be bullet proof? I've owned Dd products? To me they are very over priced it's not made in America it's another Korean amplifier with different parts I really don't like Korean amplifiers anymore I rather stick with Brazilian amplifiers price is cheaper and probably easier to repair and they don't take up a space?

[@barevids]

Yep