Car amplifier fault finding - Sundown SAZ-1500D Repair
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- Опубліковано 10 лют 2025
- This amp came in with no audio output - watch here as I guide you through my thought process of finding the origin of the fault, repairing it, and testing the amplifier to full power.
Most amplifiers these days require anywhere from 0.2 volts up to 6 volts in order for an amplifer to respond to the signal coming into an amplifier. Quite rite, sir. Thank you for this informative tutorial. I've had issues in the far past with amplifiers. Thankfully, my Orion XTR750.4 amp that runs my front and rear component sets is followed up with my CT-SOUNDS 1000.1D monoblock run at 1ohm to my two 12" Black Diamond DX12V4's powered by battery isolator & yellowtop optima haven't given me much hastle the 3 years I've been running them. I've fixed pathways, replaced capacitors, and refreshed solder connections as well as gone as far as fixed a 3 layer old school pyramid amp board that was cracked in half. However, I've never tested or replaced mosphets, and so on. This video helps provide me with a good process for reviving my set to the side amps that may see more use for myself or others down the road. Certainly, an idea of how to tackle my monoblock as the warranty is practically up this January. Thanks.
Great video. You are absolutely genius with amplifier repair AND explaining it.
hey man. from US in DC. I've been waiting to find someone knowledgeable like this. was an installer but never learned circuitry. your videos are helping me to a serious point of understanding. thank you for this!
Your the man!!! Love your skills and the simple way you lead us through the problem resolution.
Wow, great diagnosis..I surprised myself that I could actually follow your thinking.
Big amp too ... 👍
This is why I love your channel, full of tech and education
Very informative. Had the same issue with a snapped transformer lead --> LM7812. Took me ages to find it, due to the fact it was under the sealant and I wasn't so experienced enough so i could resolve it quickly.
That video is time saver for beginners ! Veryyy niceee !
Pure genius my guy another awesome vid
And that is life when repairing a amp.
Very happy to be watching a your repair videos again 👍
This is just an FYI comment so thanks for another great repair video. But I am sure you know that if you have your PC (computer) playing audio to the input jack AND a waveform generator, the negative of that is essentially referenced to earth ground. I think when you use a cell phone (a spare in case it's damaged) then you keep that ref. off of your CPU saving it from damage just in case. Still watching and enjoying this video :)
Thanks for sharing
I used to have the same soldering station and heat station all in one same as that one you do ..worked like a beast until I retired it 😂
My one occasionally drops out the heat gun for a few days then starts working again. Pretty annoying!
barevids That’s crazy lol Never had to replace the heating element in the hot air station only the soldering Iron had for years worked awesome 👏
then upgraded to JBC equipment
Seems like you know your stuff about amps how did you learn the stuff ? if you don’t mind me asking
@@QsTechService1 a combination of trial and error, and Perry Babins amp repair guide from Bcae1 ☺
barevids I’ll have to check that out you were very thorough with showing how to test with the scope pretty awesome I subscribed 😂 I have a few amps to fix for some friends what do you all fix if you don’t mind me asking
I can sit and watch your videos while day, can you do a basic course with us on video
Nice troubleshooting there Sam!
How does he only have so few subscribers & views, this information is actually useful unlike some drop kicks like 'PewDiePie' who have almost 100 million subs & 10's of millions of views per vid, just crazy.
Niche interest, dumb entertainment will always be popular with the masses
Most ppl cant understand what is he doing or saying because they dont know anything about circuitry and if you dont know anything about let's say organic chemistry you arnt gonna watch vids on it. Might as well watch foreign vids with no subtitles lol thanks Sam keep em coming love ur work
great videos man!!!Really learning alot.do you have a video were you tested and fixed a faulty pwm with a multimeter
Thumps up for your videos, 2 thumps up for MaddyV 😁👌
Just fixed my first amp, thanks :-D
Very interesting and informative. Ta.
Excellent work. Voice reminds me of Derren Brown
Thank you for the great video
For the past five years, we have purchased two second-hand Power Amplifiers, each lasting less than two years. The last power amplifier we bought new in July 2022 was the Behringer EUROPOWER PMP2000D, which only lasted for exactly two years. All these power amps had the same issue: they could be powered on but had no sound output. Do you know what the common causes of these amplifiers to fail?
You are the smartest person on planet earth 🌏 👍😎
Nice, a couple more videos like this and I'll be ready to repair my car amp that I lent to a (ex) friend and it came back with all the outputs blown and god knows what else as he tried to fix it himself.
i have a 3400D BOSS amp,and when i connect the ground it starts to burn up?everything is fine,no blown fuses,but as soon as i connect ground it starts to smoke up🤷♂️any idea?
Very well informed video
Brilliant work. Subbed.
Same thing happened on my switch mode power supply. The transformer glue isn't holding it anymore! The wire are extended a bit to reduce the stretch and fatigue, then potted the thing with silicone. Definitely will never happen again.
You are so grrat and so firendfull man i liked you i wish you will continue your greats 🎉🎉
siiick music and great video
You're great bro! You've got real knowledge! Do you have a degree in electronics engineering? Here in India, I don't think we have anyone as talented as you so we are scared to buy imported expensive Korean amps like DD, Sundown. So do you recommend investing money in imported brands or better to go with normal brands like a pioneer, JBL which are available over here? Also, I heard red & blue circuit boards are better than green circuit boards, is it true?
Hi,thanks so much your video came up very helpful...great job,but I have a question regarding my amplifier,when I connect the power cord it blows both the car and amp fuses and also noticed when opening there's a smoke on the side of the cap as well as on the back of the power port...how do I fix that.
What would cause a dead short in a amp? No lights come on just shorts out and blows fuses right away. 4 channel amp
Nice video you sir are a wizard
I have a Sundown Audio 1500 SFI it blew some resistors by the channels that go up speakers
awesome shit.. subbed. hope to learn more.. right now I'm trying to repair the amplifier from a definitive technology prosub 80 subwoofer. have a couple of resistors that have burned out. i can replace them and I find no other visible issues but would like to be able to find problems better like this.. i was using the home subwoofer in my car connected to a power inverter.. i think the resistors blew because the sub has an auto on/off and is usually constantly on in a home.. every time i turned off the car though i would hear a loud pop from the subwoofer. was told that was power discharging from the capacitors. ugh.. was a good $20 goodwill find. want to fix it.
I have a Digital Designs M2C AMPLIFIER that I bought used 2 years ago. When it arrived in the mail, the RCA inputs were damaged. I desoldered them and replaced them with the RCA inputs from the master slave link side. I eliminated the inputs for the master slave link side. When I powered the amplifier on it turned on but no signal to the subwoofer. I removed the bottom cover and looked at the components and nothing looks like it's burnt. Could this be an easy fix? Please advise.
Would you have any idea why my amp all of a sudden has barely any output? Sub is good.. wondering if I toasted my amp…
👍🏻☺️👍🏻
Nice vidoe I really enjoyed the explanation🤙🤙
Barvids i have a phoenix gold amp and it makes noise, what seems to come from a big capacitor. It plays but when i turn it up it squeels? Any advice?
Normal clipping sound
@@barevids hay thanks for your time.. Well the amp plays fine at low volume, i cant even turn it up on half volume it squils?¿
Guts look the same as hifonics brutus 1600 are they the same I had the same prob with it.
great vid
Nice
Is it possible to fix lcd screens that disappear when warm (backlight still works)
TCon board. Unplug 1 of 2 strips running to screen and power it on. If you get half a screen during either test. It's the Tcon
i have a dd m2b amp that is in pertection and the reason being i have two of them and i got rushed while i was straping them together and wired both neg outputs to the pos and neg speaker terminals and the jumper that is supposed to go to the ground went to both pos when its supposed to be the other way around one amp is fine and the slave amp is in protect and idea what might have blown in the amp
Output fets at least! 😁
Sir,. Have you been encountered a car amp 11 channel for mitsubishi pajero 2012. Car amp model is CV-0MW7B51... trouble is no sound but the power supply is good. Help me sir because i have a very very bad headache.
hey bro what can cause amplifier to go direct in protection mode when powered up? , opened it up and nothing seems to be burnt .
Thanks much.
Output fets
Check outputs gordenoehring09 @ gmail.com hmu I can help u
Can alot of these tests be done with a multi meter?
Nice diagnosed and repair.
Love your work,I've have an amp that will not turn on,it's brand new,but never been able to use,dealers ignoring me and will not replace with .I would to send it to you for repair,How can I do that?
@@stephanmurray374 if you are based in the UK, sure
@barevids I wish I was in the UK,however I'm in theUSA,damn. Maybe I'll give Derek old-school a call,thanks. I still love your content and will continue to watch,I've learned a lot from your channel about repairs,cheers.
awesome video sam.
Hi thanks for a very informative video
Sam, nice find! thats a good one! That would've got me,
Hello... r u still repairing amps? I have a earthquake pa 2300 that needs work
Yes for UK based clients only.
I have a db drive a750.1 amp that makes.a.popping sound and then when the volume is increased it going into protect.can. you help
Explain how protect mode in amps work pleeaase
Overcurrent protection: shunt resistor with voltage drop detection circuit across it
Over/under input voltage: just a simple few transistors that come on or off when voltage goes beyond thresholds
DC offset protection: combination of resistors and caps that pass a protect signal if DC is detected on speaker terminals by charging the cap too high
barevids What usually causes this? Not enough power supply or a bad battery?
@@Gambleraddictz even a bass remote knob can cause the amp to go into protect
Good day dude...been watching some of your stuff.. trying to fix a R.F. Prime R1000.1D. Amp the protection light is cycling.. any chance you know what it 6
Great! Thanks for your effort.
I've tried hundreds of you're videos because my amp is not sounding. I think my RCA touched the ground cable during operation and 3 of the 4 channel have no power, but they sound and play signal. I'm trying to understand what could have happened but despite of the fact that I'm electrician, my electronic knowledge is not enough. I would try check the transistor because it seems to be the weakest part. I would appreciate any advice. Thanks.
hi sir.. really appreciate if u have opinion or suggestions with my mohawk silver 2000 monoblock.due to my car alternator faulty maybe got to this prob occur.. After realise my amp become very hot and look inside.. did notice 2 of the last mosfet is overheating...without any doubt I oder and change both of the mosfet.. but after replacing it the prob still occur.. all sound seems to work fine no protect that I know of.. so really need your help maybe any idea what wrong with it sir??
Hey there do still repair amps? I say still because this video is so old so you never know but I have an amp that needs repair and whatever is going on with it it is acting just like this amplifier as far as it not activating or running. Be cause the amp powers or and looks like it should be functioning normal no red or warning lights but it is not outputting any sounds I have opened it up and nothing looks out of order so I'm stumped because I don't have the tools to troubleshoot at what point the signal is cutoff or if it is not being activated etc the amp is a Zedition z2400d not much info about it online but when it worked fine it really put out some booming bass pro ably the loudest and best sounding I have ever heard and I used to compete with the older early 2000s Rockford fosgate amps even took 1st.place a couple times 2 15's punch power subs and the 801s I want to say was the model number and this amp would have obliterated the Rockford for sure so I'm trying to bring the z-edition amp back to life and wanted to ask and see if you still might be repairing amps and if so if you work on send ins off of here on UA-cam like this if not I'm interested to know if you know anything about these amps as there is almost no info anywhere on it online at all and I snagged it up from goodwill that didn't know if it worked and didn't feel like testing it so I took a chance and it worked for me for a good while before my stupid ass overloaded it with less than 1 ohm and it quit working so I killed it everything the whole car cuz figured it went into protection mode and waited till the next day to turn it on and I unhooked the extra speaker that I was testing with the higher ohms and hooked up the usual set up and when I turned it on everything looked fine and like normal so I figured I dodged a bullet got all excited but when I proceeded to try to listen to it I got nothing from the amp have tested and tried everything and finally got a trade on another amp for some of my hifi gear put that amp in and walla so I'm sure it's something in the amp because the amp I got on trade was the last thing I was able to use to verify that the amp was not giving a y signal or output so please let me know and if it helps you can look me up on face book timofey samoylich will find me if you need to get a hold of me. Thanks man let me know please !
Where are you located
@@barevidsI'm located in Gulfport Mississippi can ship it to you it's a crossfire XS-8K
If I have a class d mono block amplifier with a variable low-pass filter (50-250 Hz, 12 dB/octave). Can I remove this to make the amplifier neutral or will this cause my amp to not work.
Great video man but I got a question for you man so I have this amp B2 riot 7500 I’ve had so many people say they can fix it but fail your really my last hope that I have before retiring this amp it’s 5 months old and as I was driving my positive speaker lead came off the amp and grounded therefore causing the amp to short out the amp still turns on but doesn’t have no output check it out myself didn’t see anything burnt out on it so I gave up plz can u help no one has been able too progress on it plz help
I can repair it but I'm in the UK and shipping will be more than it's worth
I screwed up litterly on my US Acoustics 4065 4 channel knowing better being impatient while playing music I accidentally shorted the channel 4 negative screw to case with screwdriver and it let out a loud crackle followed by a nonstop loud screech...I'm soooo bummed Any input what's going on?
Hey bro, I have an amp that turns on but once it hooked up then the high bass just goes on nonstop, this happens without turning my car stereo on. It's just buzz loud non stop.Can you point me to where I should look at this sort of problem please..?
I've got 4 pioneer gmd 9601 amplifiers. They all go into protection as soon as they come on with no rca or speakers connected. I looked inside and didn't see any burn spots. Do you have any idea what the problem is?
Output fets shorted. You can buy diagnose electronics with your eyes.
New sub from Philippines
you are very good
Great video
great job and thank you
hey bro i have an adictive audio 500.1 the fix it come on but no out put
What a amplifier to constantly going to into protect mode like 2 seconds after it turn on? I unplug the speakers n rca n it doing the same thing
Output fets are dead
@@barevids so it start playing again but I hope it doesn't shut down again
What song is that you were playing
New Favorite channel..
Can I send you a high current amp from soundstream 18000.1d to find out what when wrong and repair
Are those braking resistors you're using a speaker load???
Great videos, did you ever work with nitro amps? I have an bmwx-487 and i’m looking for A value resistor. Is next to the PWM IC, location RP1. Thanks.
You know your shit!! 👍
Do you offer repair service? Had how busy are you at the moment
yes, to uk customers, 4 week turnaround at the mo
Question for ya. So if the out out of an amplifier was shorted out what would be the likely cause of the channel going out? A three way speaker had broke it's tweeter off and the wires had shorted I'm assuming cuz there is no output from that channel. It's a five channel autotek and all other four channels work fine.
Output transistors
have you any experience with active crossover repair? i have an old phoenix gold ax active crossover which isnt powering up even though it gets power right to the input plug. i opened it and it had a cap that had a dry joint which i reflowed but it sill wont turn on and i dont want to start recapping just yet.
anything i could or should check or could be problematic?
Sax-1200d...
Was hoping your problem was closer to mine. But its not.
This amplifier of mine works.
But, it idles warm. To warm. I heard its a factory defect in this series of amplifier. The heat seems to be concentrated around the toriod coil.
Its out of warranty. But id rather fix it before i over stress it, accidentally, if its not up to snuff.
Have you heard of this "factory defect"?
I was told this by an Ex sundown factory warnty repair guy. Hes no longer doing sundown warranty work.
Any input would help me and my personal local repair tech get somewhere with this thing.
Thanks in advance.
Are you still needing this SAX-1200D fixed? I know 2 years later. I am that guy. I have your answer anyway. I was the Sundown warranty repair guy for 10 years, repaired probably 500 of the SAZ-1500Dv2 that this guy is working on in this video. He is really good BTW, I am enjoying his videos. I no longer repair electronics, period, sometimes I miss it, most of the time however I do not. Still fun to watch other people in the trade. I have the files on an old computer about the SAX-1200D fix you need.
@@xxcrazy_critr6661
Hey. What city were you in? Your shop.
@@xxcrazy_critr6661
I know where the shop was. Im wondering if you do.
@@xxcrazy_critr6661 what happened to you? No reply..
@@hardhead7056 I'm here, was looking for your SAX-1200D mod info, but apparently it's not in a file where I would have expected it, I know it's written down on a parts bag in my old parts cabinet in storage. Next time I am out there I will look for it and snap a pic.
Hi my friend I have the zx1500 mono black... and be used for like few weeks but today they small like burn and we just open and the black thing do like tick tick noise when you tour on o turn off and they dont do like on light so can you help me out
Probably your relay clicking on and off search causes of that issue good luck
Hey I just bought a new deafbonce aab3800.1 has a static/buzz around 77hz signal on the outputs to speakers any clue what would be the cause? (The Buzz is there without the rca cables connected and with no speaker connected.
How do you know it's there with no speaker connected if it's on the speaker terminals?
Can probe the output of the amp and I have a signal
Deaf Bonce looked at it I guess it is normal for them to have a the static/buzz sound..
@@allenl9372 yeah there will always be some noise when viewed on the scope. If you plug a sub in tho it shouldnt be noticeable sound from the cone.
Hello I need a amplifier fix are you able to help
Can you turn a 4ohm amp. To 2ohm?
AWESOME
I have these chinese car amps with the same fault tl494 ic doesn't oscillate, what could be the cause of it?
When you pulled that copper wire out after some testing... the amp whisperer
Great video! I felt like I was sitting in a classroom. Do you have any idea where I can get some 160V 100uF nonpolar electrolytic caps? I haven't had any luck here in the US.
Nothing on mouser?
@@barevids
Thanks for replying! Mouser and Digikey have bi-polar caps but not that high of voltage. The original caps are Yihcon brand BP series from an old Hifonics ZRX1800.1D. I will continue to search but this is blowing my mind...😞🤯. Never had problems finding caps.
@@jameswilliams4735 are these cylindrical ones?
@@barevids
Yes, they are the radial leads type.
What would a repaired amp like that go for? When looking at amps how would someone value a repaired amp os there a price difference
Don't ask don't tell. If someone knows you repaired it, any problem in the next 10 years is your fault 🤷🏻♂️
If I send my amp to you can you fix it I tried to find another one just like it but they don't sell it anymore
thanks for share! nice
I have a question is the oil from a potentiometer (Soundigital 12k) conductive? Bought a amp from Droppin hertz.com and I had it for less than a month never even played it and potentiometer went bad and oil came out of the board it's still Powers up Cody Johnson is trying to make it a hassle for a return.
Like I said had it less than 30 days and he wants me to fill out a form and ship the amp somewhere. I am assuming at my expense because he said nothing about a label
I got a dd m2 amp wanted to run it at .5 ohms we’ll it handle it tanks
How long does it take to repair an amplifier
I got a free QSC power amplifier with a channel dead.... how would I find out what to do to repair it?
Hi bro, I've been watching all your repair vids the last few days. Never knew I'd find it so interesting. I have a 4ch amp here that plays for a minute or so then the sound just disappears. The lights are still on but no sound. If I remove the remote and connect it it works again for about a minute. The amp also gets hot when it's on even with no signal. Opened it up and saw 2 of the voltage regs gets hot (7815). And 2 next to them (mur16200) both have short between gate and source. What do you recommend I do?
MUR1620D are not fets they're rectifiers. They're meant to have a short between 1 and 3 as you're just reading the transformer winds. Voltage regs do run warm since they're dropping voltage but shouldn't exceed 60°C. If it's a class D amp I would take a scope and see if the switching waves dissaper when the sound goes. If not, trace the audio through the board and see where it loses it.
@@barevids cheers! Will have a look.
So, I have a Hifonics Brutus Elite 1700.1 amp. My silly self decided to clean up the wires in my trunk which meant disconnecting the RCA's from the amount so I could run them around some other wires which would allow me to hide them more effectively. I also have a 2 farad capacitor mounted to the back of my seat. When I disconnected the RCA cables from the amp they accidentally touched the positive connection on the capaictor and of course my amp stopped working :( ...I have absolutely no experience repairing these so I'm wondering if I could send the amp to you for repair or if anyone can advise where I could send it for repair?
Where are you based?
barevids how much would u charge to repair a Hifonics that’s going into protection mode?
barevids I’m n Texas.
I have a strange problem. Positive and neg touch inside the amp somewhere when you hook it up it sparks and then goes into protect. Doesn't blow a fuse. I took a multi meter and tested conductivity and one probe is hooked to the neg the other to the pos and it beeps. Took it apart but I am not a amp genius so I really couldn't see anything wrong but something definitely is.
Problem*