How to Repair a dead Car Amplifier in less than 30 minutes.
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- Опубліковано 8 лют 2025
- This video will show you how to diagnose and where to check if you have power problems with your car amplifier.
It will also help you diagnose the problem if your car amp goes into protection mode.
The introductory Part Of the Video shows how i already opened the car amplifier and all screws were already loose.
I went further explain the various sections of the main board of the car amplifier which comprises of mainly the:-
1. The input or power circuit
2. The intermediate circuit or channels
3. the pre-amps circuit
4. The output circuit.
If you want a detailed explanation and more related content such as this then leave a comment bellow and we will get back to you as sooon as possible.
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A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of field-effect transistor that is widely used in electronic devices and circuits. It is a three-terminal device that can be used as a switch or an amplifier. The MOSFET has three layers: the source, the drain, and the gate. It operates by controlling the flow of current between the source and drain terminals using an electric field generated by the gate terminal. MOSFETs are commonly used in various applications, including power amplifiers, voltage regulators, and digital logic circuits.
That’s very correct. Thanks for the comments.
Very thorough explanation! Great job , thanks for your time!
Glad it was helpful!
Nice to see some SAns techies on the tube... So many mistakes on this video. But that is how you will learn. Keep doing what you brother.
Thanks for the tips!
Thanks for the video. Take care.
Thanks, you too!
Wow that's very helpfull...
Thank you Boss🙏
Stay tuned for more exciting videos coming up.
Thank you for a thorough and clearly explained tutorial sir!! Just a couple quick questions, if that’s alright:
1. @ 4:02 , the MOSFET on the board measured 0.148 voltage drop; but doesn’t a good MOSFET require ~ 0.3 - 0.7 voltage drop?
2. In your PCB troubleshooting process, do you test each component 1 by 1 until you land on the faulty one?
Answer to question 1 is the voltage drop when it’s connected to the circuit can be confusing at times that is why to get the correct voltage drop you need to disconnect the power mosfet from the circuit first.
Question 2 answer is I always troubleshoot using the reverse engineering method.
@@cedricdebossrepairsUpington Thanks for your prompt response sir. Can you please clarify how your reverse engineering method works?
Reverse engineering works like this if you have a missing 12volts on the output you start from the output section and trace back all the connections which are connected to the 12volts power rail inorder to restore the missing 12v
@@cedricdebossrepairsUpington does that mean you check for continuity between each 2 consecutive components on each trace? Or just check each individual component to ensure it’s within spec? (this is my last question, I promise 🙂)
Continuity will help you identify the components on the rail and you can individually isolate the potential faulty components by removing them and checking them out of the circuit. If there is a short and you remove a component and the short is gone then automatically that component removed is faulty. You can contact me on my Facebook page for more detailed info if needed. My Facebook page is Cedric DeBoss repairs
🔥🔥🔥🔥🔥🔥🔥thats one thing about you ,u know what you are doing
When a resistor is burnt. Will it affect the sound output?
yes depending on where the resistor is located in the circuit.
You really need to improve those soldr joints, i'd reccomend using some flux.
Will do. Thanks for the tip!
Hello! I have a question. My amp keeps blowing mosfets. As soon as i turn the amp on the mosfet blows . I have tried changing all mosfets but still the same problem. Its the output mosfets. If i only use 1 of the outputs to speakers the mosfet does not blow. But as soon i try the outher output it blows again.
2:19 Soldering of MOSFETs is tragic.
Nice job
Thanks!
Where are you located and do you do repairs and upgrades to amps
We are located in Upington,Northern Cape south Africa. you can always send us an email for more information.
I could tell you're a fellow South African by your accent🇿🇦
the best in the game
You are great bro
Don't forget to like and subscribe
If car head unit is stuck on boot loop, where should I start? There is power, no obvious burning on the board, no obvious damage on parts? I have Toyota entune radio unit. Thank you for you video
Nice video should make some more about the car amplifier repair like how to fix amplifier in protection mode the amp doesn’t have the external fuse on the the amp how to rest those kind amplifier bro
Noted! Have you checked out our latest video on protection mode? Go check it out if you haven’t yet checked.
So the generic mosfet is 55v? I have the IRFZ44v is that generic? Do I need to replace with the same or can a generic mosfet work? Thank you
yes the irfz44n are one of the best mosfets to use for switching power supplies
Is a mossfet a common issue for power failure? What is the first thing you would look into for power issues?
Yes there are high power and lower powered Mosfets
Question 2 : MOSFETS
Hello! can you help me?
I have a problem with one of amplifier, sine wave output is in the noise (noise is 0,520v wthout any signal) (replacing change amps can (but too cant) help for a moment with clean sine wave, but after 1-5 minutes sine is back to noised sine wave.
What is causing this problem? RCa input is clean. After my test with third amplifier, for a moment i got better sine wave in second amplifier, The problem: Amp blowing speaker much before distortion output, bass is weak / weird, flexing car but i dont hear and fell presure, Wave sine on out amp is rippling like Phase reverse - back normal - reverse - back normal itp. In warm temperature sound (bass) can be much better for a few minutes only. Or sometimes multipe disconect power wires can help back clear sine wave
Which issue fits this problem?
Input noise, Resistor noise, Thermal drift. And how to solve this problem. Thanks!
Hi there i hope i can really help you out. First send me a picture of the inside of the amplifier so i can pinpoint what to check as u begin your diagnosis. send the video to my whatsapp +27747788345 thanks and waiting..
My amp layout is different it has only 4 mosfets on the left and 2 on the right side. Are all 6 dead? Or just the left sides Mosfets dead?
i think the 4 are mosfets and the other 2 are the rectifier diodes
I have a question,what is the name of the tool you’re using to power the amp ?power supply ?
yes dc power supply.
My jvc ks-ax3104 was dead and i successfully repaired.but some minor issue is one side channel mosfet is very hot
Please guide me
You must check the model number on the MOSFET and replace that mosfet. If a mosfet starts getting physically hot then it means it getting more current than it can handle or was meant to handle. The quickest fix is identify the heated mosfet and change it.
@@cedricdebossrepairsUpington thanks for guide
@@cedricdebossrepairsUpingtonwhy is is getting more current than it can handle ? And if you change the mosfet, won't the new mosfet be fed more current than it can handle ? What component is sending more current than this mosfet can handle ?
You should do more car audio videos
Check my latest video it’s on a car amp
bro if i don';t have a car stereo, how can i trigger the car amplifier? i mean can i use 12v+ to remote trigger terminal of car amplifier?
Yes you can and i have a video for that on my tiktok
Hello there,i wanted to ask your opinion on something, i have a older Alpine amp and im needing the fuse holder thats soldered to the board,the only place where i have found one that looks almost identical to what i need is one of those Chinese companies and they want to sell me 1000 of them, lol, i just need one or 2, i can send you a picture of what it looks like at your contact info and maybe you might know someone that has one?
I find it hard to believe only these people i found would have one,seems like something you could find on eBay in 2 minutes but i haven't been able to or i'm not using the correct keywords? thank you for your time, i really appreciate it.
Send me the pictures on whatsapp +27747788345
question, could you pull mossfest out of an old amp that is good aslong as it's same ones and reuse them? have 2 old amps that have good mossfets and i have a burnt one in a new amp i just got
Ja you can.
@@cedricdebossrepairsUpington you can not just take any old mosfet from one amp and put it in another and expect it to work. they need to match specs
How do you know what side is the input and the output side??
the smaller Mosfets which are the power Mosfets shows you that it is the input side and the bigger transistors are always found in the output section.
So I have a kicker cxa1200 I let my little brother use. He told me he accidentally hooked up pos and neg backwards, now my amp is stuck in protect. I popped the panel off can’t seem to find any damage or burns anywhere do you think this amp is toast? I’m at a huge loss any advice would be appreciated
Will need to have a closer look at it
Does the mosfe look shorted or is just shorted
shorted mosfet will cause the fuses to blow everytime to you connect your amplifier to current.
@@cedricdebossrepairsUpington I am looking for a new mosfet; it shows that 4 of 6 are bad. But I think that they may just be linked and who knows which are actually bad and which are not. I have a question what happens if you don’t have the info about the mosfet’s vgs does it need to be a certain vgs? Volts options for what I searched are 55v and 60v. The mosfets say: IRF44v(not n). So does it matter what voltage you have?
@@speakersubject554 search the part number on google and buy the exact replacement parts
@@cedricdebossrepairsUpington my mosfets burned up, but my fuse isn't blown. ?? Maybe the previous owner replaced the blown fuse ? I checked my gates and they are ok.
can i put whole motherboard to oven for a little time maybe fix?
Depends on what the problem is with the board
@@cedricdebossrepairsUpington will it be fire or explosion hazard if i try that at home?:D there seems to be some kinda issue with some soldering maybe it works on like 1to 15volume but when i put 16 above volume amp goes to protection.. somedays it plays very good loud and clear no problem and then again it has days not working at all. not about cars power or ground or rca ive checked everything 5times..
t@@lazzixx that's a different issue. different topic.
@@Mr_BUSINESS_24_7 ok thanks for your pointless answer
@@lazzixx the answer is, yes you can at your own risk And no it will not fix this issue.
How do you know what to replace the transistor with? I have H12C2OCA, and can't find a reference to them anywhere.
Send me a picture of the amplifier to cedricrepairs@icloud.com
What determines the watt output
Watts = Amps x Volts
Were is your shop located
where are you located
Upington,NC
Yeah that's way too far do u knw any good repair guy near pretoria
What if only subwoofer don t work? It s car s subwoofer , from the factory. Suddenly stopped working. How would u fix that
When i plug my amp it will blow a fuse i tested the positive side and i shows negative on both sides do you know what can it be
If you can explain more and send me some photos then i will be able to help.
Digital star sound Rapter 1channel car power amplifier show protection light. What thing burn inside
Check the output transistors.
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Keep watching…
And short after 30 second.
Exactly!
Great material,
I have one question about the Phoenix Gold car amplifier, I disassembled it and noticed that the transformer, one of the turns is very loose, should I attach it somehow or glue it with some special glue?
Thank you
use soldering wire and soldering iron to fix broken soldering joints.
Need my 5500 watt audio pipe amp fixed
I saw board burned
yEP