Car amplifier fault finding - Sundown SAZ-1500D Repair

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.

[@beans301]

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!

[@OldSkoolF]

Your the man!!! Love your skills and the simple way you lead us through the problem resolution.

[@jeremywilliams8558]

Great video. You are absolutely genius with amplifier repair AND explaining it.

[@TS_sound]

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 !

[@SVSunnyJim]

Wow, great diagnosis..I surprised myself that I could actually follow your thinking. Big amp too ... 👍

[@RoadRunnerMeep]

This is why I love your channel, full of tech and education

[@jasonbrindamour903]

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 :)

[@matthewmassey2333]

Very happy to be watching a your repair videos again 👍

[@strictlyamps820]

Nice troubleshooting there Sam!

[@mad_mechanic]

Pure genius my guy another awesome vid

[@joshhanson6777]

Sam, nice find! thats a good one! That would've got me,

[@jimmymodise5353]

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.

[@HashiriyaSquadron]

Brilliant work. Subbed.

[@JohnDoe-mx1sq]

Just fixed my first amp, thanks :-D

[@orac229]

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.

[@QsTechService1]

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 😂

[@barevids]

My one occasionally drops out the heat gun for a few days then starts working again. Pretty annoying!

[@QsTechService1]

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

[@barevids]

@@QsTechService1 a combination of trial and error, and Perry Babins amp repair guide from Bcae1 ☺

[@QsTechService1]

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

[@joeshaft]

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?

[@riveralley]

And that is life when repairing a amp.

[@juliorodriguez8922]

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.

[@ls87gbody]

awesome video sam.

[@mycbdrx]

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.

[@OldSkoolF]

New Favorite channel..

[@lombechangala2803]

great videos man!!!Really learning alot.do you have a video were you tested and fixed a faulty pwm with a multimeter

[@starrlucky6549]

Great! Thanks for your effort.

[@bben5674]

Excellent work. Voice reminds me of Derren Brown

[@marlonhusain4066]

I got a dd m2 amp wanted to run it at .5 ohms we’ll it handle it tanks

[@ruikazane5123]

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.

[@thedailybench2527]

I got a free QSC power amplifier with a channel dead.... how would I find out what to do to repair it?

[@bbtomy28]

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

[@95Sn95]

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?

[@xelectronics5411]

Nice vidoe I really enjoyed the explanation🤙🤙

[@naiaet9549]

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..?

[@armandomorenoromero8531]

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?

[@MrClydieBoy]

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.

[@abdomination]

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.

[@ilovetoyotatrucks]

Side note who is the music u played?

[@bluboy3100]

Can alot of these tests be done with a multi meter?

[@awaazhoosein6565]

Hi i have a ds18 6000.1 amp it playing and goin into protect when it turn up can u help me

[@edud8452]

Guts look the same as hifonics brutus 1600 are they the same I had the same prob with it.

[@jhititup]

Nice diagnosed and repair.

[@jumpynotes]

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?

[@tyte90]

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…

[@bernardpeter4178]

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??

[@sayedmuqaddim8202]

Hi bro I have a TA-V5000.1 monoblock issue is when I turn up the sound on my radio it blows the amp fuse and when I checked the 12v connector on the amp it seems to be rusted Any suggestions Thanks

[@tyronearendse1722]

Hi thanks for a very informative video

[@JuanjeteMS]

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.

[@opiegillia7169]

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

[@8menime]

Thumps up for your videos, 2 thumps up for MaddyV 😁👌

[@BoxImpala313]

What would cause a dead short in a amp? No lights come on just shorts out and blows fuses right away. 4 channel amp

[@denzellouis9384]

hey bro i have an adictive audio 500.1 the fix it come on but no out put

[@joeanderson444]

Are those braking resistors you're using a speaker load???

[@frankshanks9013]

What song is that you were playing

[@jsmoothkidd6496]

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

[@JustFun-iz9rf]

great job and thank you

[@Live_Loud]

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?

[@waynewayne3709]

Very well informed video

[@thethoughtmaster]

I am trying to figure what is wrong with my amp. No one seems to answer my questions, I have to search too long for an answer.

[@mystonerlife4207]

How long does it take to repair an amplifier

[@rolandopanganiban333]

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.

[@MrJimmyak47]

Nice video you sir are a wizard

[@abisaiamatalo2769]

Great video

[@mrbumcraic5046]

Nice Is it possible to fix lcd screens that disappear when warm (backlight still works)

[@whoismarkjones9283]

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

[@joeJoe-pb3su]

Can you turn a 4ohm amp. To 2ohm?

[@joshwandron6042]

I have a Sundown Audio 1500 SFI it blew some resistors by the channels that go up speakers

[@ettienekotze8687]

siiick music and great video

[@carlitomadrona6211]

I have these chinese car amps with the same fault tl494 ic doesn't oscillate, what could be the cause of it?

[@andrevarnava6115]

When you pulled that copper wire out after some testing... the amp whisperer

[@delaneo100]

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?

[@barevids]

Output fets shorted. You can buy diagnose electronics with your eyes.

[@RickyBobby-es3tn]

A/c , d/c coupling?

[@SKINxSLAYER]

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.

[@barevids]

Output transistors

[@canerbayburt2491]

You are so grrat and so firendfull man i liked you i wish you will continue your greats 🎉🎉

[@TM_Da_Destroyer]

Hello I need a amplifier fix are you able to help

[@Fizzer99]

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?

[@barevids]

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.

[@Fizzer99]

@@barevids cheers! Will have a look.

[@jawnwallace6182]

Can I send you a high current amp from soundstream 18000.1d to find out what when wrong and repair

[@ilovetoyotatrucks]

So is this why the amp didn't perform aswell as THE Orion? 👀

[@rizwanahmed1064]

Sir solid audio f 15D fualt code please help

[@badasscaraudio2240]

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?

[@barevids]

Normal clipping sound

[@badasscaraudio2240]

@@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?¿

[@javierlozano4066]

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

[@dannyarmata8878]

Probably your relay clicking on and off search causes of that issue good luck

[@justforkicks192]

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.

[@barevids]

Output fets

[@gordenoehring6530]

Check outputs gordenoehring09 @ gmail.com hmu I can help u

[@lenniewilliams8951]

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

[@barevids]

Output fets at least! 😁

[@csaimol7066]

Can someone help me. I have an amp when I connect the power supply the red light blink once and goes off, battery voltage is about 13v, I have opened the amplifier and seen no physical defect, I have checked the MOSFETs with multimeter I didn't find any problem. No prob with ground and power supply too. What may be the cause??

[@renec0327]

I think is the same problem like he explained the output i got the same problem in my amp

[@jameswilliams4735]

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.

[@barevids]

Nothing on mouser?

[@jameswilliams4735]

@@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.

[@barevids]

@@jameswilliams4735 are these cylindrical ones?

[@jameswilliams4735]

@@barevids Yes, they are the radial leads type.

[@HashDogg06]

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.

[@barevids]

Niche interest, dumb entertainment will always be popular with the masses

[@dannyarmata8878]

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

[@celebritystreetmuscl]

Hello... r u still repairing amps? I have a earthquake pa 2300 that needs work

[@barevids]

Yes for UK based clients only.

[@danielmoraes9637]

thanks for share! nice

[@XristoforosMoisidis]

what languege is that?

[@allenl9372]

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.

[@barevids]

How do you know it's there with no speaker connected if it's on the speaker terminals?

[@allenl9372]

Can probe the output of the amp and I have a signal

[@allenl9372]

Deaf Bonce looked at it I guess it is normal for them to have a the static/buzz sound..

[@barevids]

@@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.

[@asspylonker]

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?

[@barevids]

Where are you based?

[@papergatorztv7087]

barevids how much would u charge to repair a Hifonics that’s going into protection mode?

[@papergatorztv7087]

barevids I’m n Texas.

[@joeygangsta4806]

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

[@barevids]

I can repair it but I'm in the UK and shipping will be more than it's worth

[@tman8209]

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.

[@tman8209]

Problem*

[@RickyBobby-es3tn]

What's the minimum bandwidth scope that can be used for amp repair?

[@jojoposter]

Assuming you just want to see the switching frequency of your class d + a bit of margin i'd say min. Bandwidth should be 200kHz.. since most cheap scopes give you 25Mhz to 50Mhz as the baseline model's bandwidth any of those should be good

[@RickyBobby-es3tn]

@@jojoposterwhat about a/b class are they any different?

[@Elnufo]

Some weired phasing going on between the Camera's Sensor and the Scops's screen. Blacks out the Scope partially. The do not talk to each other correctly in terms of Framerate i guess.

[@eagle5720]

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

[@barevids]

Output fets are dead

[@eagle5720]

@@barevids so it start playing again but I hope it doesn't shut down again

[@esiakaharding9124]

you are very good

[@guillarte016]

New sub from Philippines

[@davidmonroe4436]

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

[@whoismarkjones9283]

Don't ask don't tell. If someone knows you repaired it, any problem in the next 10 years is your fault 🤷🏻‍♂️

[@colinjeremiah7815]

Need help where can i or can i know the chip or board number for ta1.2000d wher can i get it

[@colinjeremiah7815]

Driver board

[@majdmejo]

Can u help me to fix my ! Plz

[@robbieskipper166]

Hey bro I have a tara 800x4 no sound out

[@bassmanwell1255]

Explain how protect mode in amps work pleeaase

[@barevids]

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

[@Gambleraddictz]

barevids What usually causes this? Not enough power supply or a bad battery?

[@f.a3202]

@@Gambleraddictz even a bass remote knob can cause the amp to go into protect