I had a long running hobby of designing and building amps. A lot of extremely big and powerful solid state amps and a few of them are huge class Gs. I’ve repaired quite a few production amps too. And LOOOLLL there’s no way I’d have been able to fix this thing 🤣🤣. Even with a schematic. That was insane. You’re a seriously talented amp tech with an amazing level of patience. Hats off to this. I’ve never built or worked on a class D though since it’s an intimidating road I didn’t want to go down. For reasons like this 🤣
So glad i found your channel again dude. I actually used to watch your subwoofer videos in my very early teenage years because i loved subwoofers and now 8 years later i try fixing what i can and it turns out youre doing amplifier repair videos which is just sick. I watch alot of component level board repair videos in my free time aswell but theres not many people in the uk that i know of that do it sadly. so coming across youre newer videos was a relief. im also in the uk.
Tenacity. I loved this video. I end up in similar hair pulling situations when troubleshooting boards. I work on industrial controls, and it's all learned on the job. I wish I has your skills. Great video! Learned alot, if anything, just keep probing, take good notes.
As a newb tech this is why I’m nervous to dig into Alpine, JL, Fosgate, etc. I prefer the longer more detailed vids myself as I use them for reference while learning/dealing with a similar problem, but the new breakdown of previous work combined with your usual post was cool, def did it justice with the important info bro and actually learned new troubleshooting techniques, ty Sam!
Yeah boy!... Congrats Sam. Thank you so much for sharing this success. Watched all the livestream replays and so happy to see it come to a good finish for you
Ah the frustration of it not being what you thought. Then the compound failures. I presently have a switchmode supply and class d mono amp all on one board that has a low output. No info, and no comparison. What a chore it is. A brilliant example of how things can be fixed with enough time thrown at them. The right to repair should include access to technical information though or its just a lot more of this. Thanks for your efforts.
Awesome, that is one complicated circuit design, would love to see a full run down on what make their class AD design different from your typical class D
it's just a marketing term, it's still a class D amplifier in addition to what rockford fosgate says is an extra feedback loop (which i think all class D amps should have) between the filtered output and the input to reduce distortion, apparently it also has dynamic switching frequency that changes during different power levels (according to them it increases fidelity during lower power levels but im skeptical)
Love your vids, as fellow audio repair tech I get just as excited to see you trace down the origin of the issues like a complete surgeon and see the Great work! Keep it up 👌 cheers from Cali
That's very good going, hats off to you. Fixing that amp without a schematic is pretty bloody awesome. I guess the dual transistor packages are configured as differential amplifiers/comparators, checking signal or DC conditions, maybe in a closed loop. Either way I'm impressed by your tenacity; kudos.
@@barevids i would guess they wont release the repair manual but not a bad idea to ask them either. i had a good luck asking for repair manual on some brands!. sometimes we (engineers) use discretes to get a specific performance or function but sure enough it made a blind repair more challenging
I agree with all the others.....I love this format! It's perfect for these special longer that expected .....painful repairs. I've listened to these amps and own a 1500bdcp and a 400.4, a 4 channel and a baby brother to the one just repaired. They are amazing amps.....easily competition quality! Then what's the problem??? The name and the history brand of the company, Rockford Fosgate, scares the SQ competitors like a pack of hot dogs at a campfire (If ya know what I mean lol). I've honestly wanted to hide these, installed, under a fake rack of Zapcos and see what happens!!! Oh I know they would be amazed! Honestly, if most people would give an honest opinion while comparing an RF and any other SQ amp, there would be no obvious sound differences! OK ok okkkkk.....I'll stop. LOL! Great video....and the host made it greater!
I had a t1500bdcp that would sometimes work perfectly fine and other times not power on at all. Bypassing the protection comparators allowed the amp to turn on and build rail voltage but sometimes it would have no output, and sometimes it did. I would also sometimes come back the next day to the amp working perfectly fine without even doing anything to it the previous day. I spent so many hours on that thing that in the end I concluded that there must've been a (or multiple) broken internal trace somewhere. Without schematics it makes repairing these RF amps pretty difficult. Good job on finding the fault :)
Trying to learn something watching your videos....very interesting to me anyways! You should go over the amps that you are working on and talk about the quality and design of the amp!
rockford Fos, has a $300 USD maximum/minimum repair cost, will fix any amp /any reason for a FLAT $300...its great deal, but your skills are magnificent!!
Hey Sam, if I send you a bass 12k that no one else has been able to fix (shipping paid, you can have the board if you want) would you like to do a video on it? Output stage is ok, power supply burned and the amp lab couldn't figure it out.
My t800-4ad stopped working, and was going to be my first amplifier repair. Needless to say, ****. :D Also have a t600-4ad which started killing speakers, probably shouldnt buy these amps anymore. :P BUT that being said, your videos helped regain my interest in trying to fix some of these amps so cheers.
I got a Rockford 1000x5 with a couple blown transistors. Put some mulch in my car and apparently a lil water got in and blew up 2 think power supply transistors. All so got a old school 90’s punch 100x that got in a accident and actually knocked some of the caps off the board. Would love to get a quote on possibly fixing these.
this really makes you appreciate the Simplicity of Korean designs. there are some people that stream games and then there are those that stream amplifier board repair. some people just want to see the world burn🤣
You should buy a thermal camera…that transistors should show up some heat beeing faulty…these way you could locate the faulty much faster…however nice video 😁😁😁
I have thermal camera already 😁 I did check but no heating. Was only a small leak. I maybe forgot to include this part while editing... The raw footage is like 30 hours hahaha
Both my amps are jl audio and after watching the last few videos you've done on jl and now rockford I'm actually starting to think without having a BAREVIDS type repairer in Australia it's probably better not to own these super complex amps as no one will touch them after warranty and that's a lot of money to be throwing them away if something goes wrong after warranty is out lol
RF makes all their own designs. Chip set, etc. are specifically for RF models. That's what makes a RF a RF amp. JL is similar. Not sure which is better/higher quality. Plenty of cheap amps out there that make a lot of power in a clean manner, and some come with free option of setting vehicles on fire, like Sundown. Pretty sure Skar amps have free fire starter circuits built right in too.
Their prime amp line is a more generic design, still has some Rockford Fosgate touches though. It would be nice to see them come out with some new stuff, hopefully with them being acquired they will release some of the new stuff they have waiting.
@@charleswp71 I have 3 RF AMPs right now. I have run the shit out of them for several years. No problems whatsoever. Actually, they always impress me with sound quality and ability to push the hell out of some speakers very cleanly.
@@RobHTech me either but I couldn't help myself. I have the t1500, t1000 and t400.4. They are ridiculous overpowered and yes overpriced comparing to.othsr amps and wattage for the money. I'm usually a cheap ass that runs orion, Kicker , planet audio value type stuff but once I got one t series I had to have more lol
Do I have a schematic for a Rockford 1000x5? Blew some mosfet think on power supply side. Mulch dripped water on it and it exploded 2 mosfet but don’t know what to replace them with cause they vaporized there part numbers.
i own this amp.. bought it on ebay for 400$.. reason in 1999, i bought an RF power 800a4.. that amp still works (though has some cold solder issues with the pots).. I pretty much got every bit of my money out of that amp and could still bring it back to life... not saying other amps couldnt do the same ( i also own 2 mtx 81000ds which both still work fine from 2002) but why go elsewhere?
I have the same amp. Amp upon power up flashes in and out of protect and pops and crackles all speakers until it warms up, then plays completely fine once warm. What could be the cause?
The opening statement...hehheh, yeaaaa, I've got a Punch PBR300X2 that has been irritating me muchly for repair and it's not even that complex, just finnicky and seemingly haunted :D EDIT: whoa, you've got loads of videos since last I was here. RU-vid fucking pushed zero notifications to me for any of them EDIT2: Fuck me, this repair is turning into a rabbit hole of despair and hell for you! That was tense as fuck haha
Remember all those videos that scare the dickens out of you when you focus on one thing and then this loud scream comes out of nowhere? That was me @ 12:06
Is this because of Rockfords class "AD" which is a fancy variable switching frequency to lower distortion and then at high output levels you get more power but with a little more distortion? thats what I have heard
sure enough a bare class D without any fancy circuity would be much easier to repair. that's if you were wondering why this amp is hard to repair without schematic
@@barevids i look at this. And i have to ask . Class a/b VS class-d . What is easy to diagnose and repair ? I Just start today with test repear of my old Amps. I try to fix a caliber amp from active subwoofer And set your RU-vid channel on and try the same wy to test the stuf And learn more about electronic this way. And yes i have basic paperback off electro but not like what you do (car electro repair)
I’m a new subscriber. Do you have a discord ? Also, I have just started recently in PCB repair, these two amps that I have our my first to repair, from a friend. It’s not life or death if I fail. Rockford punch 800a2 and kicker zx750.1 On the kicker, I’m told it was a working amp, but a previous repair attempt from the actual owner himself was replacing the 2 damaged 40amp blade fuse holders on the board with 2 marine grade inline fuse holders. Not rated for 40amps and obviously horrific looking . I have not been able to source replacement fuse holders. The design in my opinion is horrible from an engineering standpoint, as the vertical posts themselves (perpendicular to the board) is actually what supports it physically. Anyway, any idea where I can purchase these ?
Hey buddy! theres a discord somewhere ill try and find a link in a bit... in regards to the fuse, dont bother trying to replace it. All amps should be fused along the power wire anyway. having onboard fuses is just a secondary failsafe and most amplifiers nowadays do not have them. I suggest simply bridging over the fuse traces with some thick wire or something.
@@barevids nice!! I always wondered if it was a redundancy for the main power in or for some other internal circuit since it seemed to go without saying you should fuse 12v in.. but I guess some fail to…
buen día, te hablo desde bucaramanga/colombia, soy seguidor de tu canal por youtube. tengo el mismo problema con una ROCKFORD 1000.4, podrías darme información de la referencia de los IC Y DONDE LOS PEDISTE. GRACIAS. Good morning, I am speaking to you from Bucaramanga/Colombia, I am a follower of your channel on RU-vid. I have the same problem with a ROCKFORD 1000.4, could you give me information about the IC reference AND WHERE YOU ORDERED THEM. THANK YOU.
Hey can you do a sine wave test on the dd zvl module and see how accurate the crossovers are If you don’t have a module I can ship you mine to test if you ship it back
3000+ views! Go Sam for the win. honestly brother if Rockford Fosgate hasn't reached out to you with an offer of employment, and a nice fat pay cheque, by now, they are the ones losing out! Great video as always. sorry haven't been around much, health issues. Take care and be well!
i have a Luxon 1000 d reference amp just curious anyone have one of theses or have you ever repaired one i have one that died but it was well abused the manual for the amp states 0.1ohm stable and warranty is void if you do not run a minimum 200 amp fuse the amp does load down well do not no if stated power is correct for this amp is older amp and cannot be found anywhere information is hard to find
Watching Louis Rossmann for quite some time now and I gotta say this shit looked WAY MORE complicated than any MacBook repair I've ever seen. I didn't get why this amp failed the way it did tho.
i love rossman, but ya this amp stuf is super complicated,,, amps are 1 demension larger in size ....in comp. your replacing chips, not parts 1 at a time
got a p500.2 and a p400.4 and i cannot see anything wrong with them with the exception of poor sound quaility .. i have basically rendered them shelf ornaments after opening them up.
