tpa3116d2 board issue

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indikaperera

Member
Joined 2020
#1
Dear all,

I am new to this forum as well as audio electronics.
So I need all experts support from here to figure this out.

I started a project using tpa3116d2 Chinese board.. and supplied voltage via laptop charger 19v. but when I switched on the circuit..one channel of my speaker popping up and down repeatedly..no stopping at all..only one channel..other one and sub is ok.. so with this issue I also connect sound input through audio jack in..sound is very low and also stoping and starting continuously same as my speaker pop up.

So please support to figure this out.

Thanks,
best regards,
Indika Perera

IMG-20200406-200100.jpg
 
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#3
Yours is obviously defective.

Check if you have a short circuit or low impedance on the power rails. These amp chips on these boards are likely not genuine, and the way they react is pretty typical of a power supply failure on fake chips to me.

Fake chips have a tendency to fail before being used and the lack of QC in china's second hand market isn't too great.
 
#5
HumbleDeer said:
Yours is obviously defective.

Check if you have a short circuit or low impedance on the power rails. These amp chips on these boards are likely not genuine, and the way they react is pretty typical of a power supply failure on fake chips to me.

Fake chips have a tendency to fail before being used and the lack of QC in china's second hand market isn't too great.
Click to expand...

Thanks for the feedback,

I have attached both 4ohms as well as 8ohms speakers..result is same..but some youtube vid feedback says board itself has overload protection..this kind of thin happened due to that...any idea? thanks
 
#6
They have internal protection, if they're using real chips. But are they?

Protection circuits protect for short circuit on the output; voltage spikes, over current, etc.

But it can't protect if the problem lies before it, and it keeps cutting power off to those protection measures.



Have you gotten in contact with the seller to let them know of the defect?
 
#7
Thanks for the photo.
You are not the only one having this problem.
Try for a start to do the following measurements: NO power connected, speakers disconnected, Ohm-meter in 20KOhm range - measure from all 6 output lines (2 for sub, 4 for stereo) in turn to power "+" and then to power "-". Do any of these measurements give you less than 1KOhm?
 
#8
FauxFrench said:
Thanks for the photo.
You are not the only one having this problem.
Try for a start to do the following measurements: NO power connected, speakers disconnected, Ohm-meter in 20KOhm range - measure from all 6 output lines (2 for sub, 4 for stereo) in turn to power "+" and then to power "-". Do any of these measurements give you less than 1KOhm?
Click to expand...

Hi..friend.. I have checked all the ports along with + and - so reading as follows,
(-) --- all the port pins give arround 12k
(+)--- all the port pins give around 70k

any idea?

thanks,
best regards,
indika
 
#9
Thanks humbledeer,

Anyway I have purchased it longway back and just through ebay..I don't think I can get any support from the seller since it is not much cost.. but at the moment I can't get new board due to Covid-19 and the same time it is not worth to buy similar bad item..I just wanted to know is it common issue due to my lack of technical knowhow or bad quality product? So that are there any method to check the chip level issues in the board?

Thanks,
Best regards,
indika
 
#10
FauxFrench said:
Thanks for the photo.
You are not the only one having this problem.
Try for a start to do the following measurements: NO power connected, speakers disconnected, Ohm-meter in 20KOhm range - measure from all 6 output lines (2 for sub, 4 for stereo) in turn to power "+" and then to power "-". Do any of these measurements give you less than 1KOhm?
Click to expand...

Hi..I have seen that you have advised some other guy who had same issue as me but he didn't reply after test that you have suggested..anyway I have followed that second test that you have told him too..most probably which may be your next guidance after come back online.😊

Input sortage test--- temporary short (+) & (-) port for a while and then set multi meter to ohms meter and measure resistance between two polls.. reading is climbing continuously and go beyond the multimeter limit..So according to the guidance given by you test is PASSED.. So what you think about my issue?
Thanks,
best regards,
Indika.
 
#12
Hi indika,

My wife has put me to work so there are delays in-between my postings.

I have removed some 5-6 defect TPA3116 chips and all of them showed less than 100 Ohm between one output line and one supply terminal. You passed that test so there are chances for repair.
Can I persuade you to remove the output filter coils (two) for the channel where the speaker just moves in and out? We need to see if large current is running through that output (and load) only or it is also inside the chip (from the supply pin and down to ground directly).
When you have removed the two filter chokes, put speakers on the two outputs with filter chokes and see what happens when you put power ON.
 
#13
Hi..mate...it is ok..I am waiting for you all responses..and knew you all may busy at the moment..it is ok..I can remove two coils..(I have only a normal bouth not having rework station) so then I have to sold two wires of speakers on to it..isn't it? thanks,indika
 
#14
No, not as I understand you. It is not a matter of just removing the speaker because then you end up with and unloaded class D output and that may damage the chip. You have to disconnect at least one of the wires to each of the two chokes (toroidal inductors), eventually remove the two chokes completely.
 
#17
indikaperera said:
I have a doubt inductive coils are just a coil though..so how they misbehave..����
Click to expand...

Rather than pulling parts off the board, it would make more sense to try it with dummy loads of known quality first ... get some 8 ohm 1 or 2 watt resistors to use in place of speakers, then play music at very low levels to test.

From your initial description I would think you've either got a short someplace or you have a power supply that isn't up to the job.
 
#18
indikaperera said:
there are few coils..which one should I remove? sorry friend I am novel to this electronics..I am not genius like you..thanks , indika
Click to expand...

If it is the channel with the cross that misbehaves, these are the two coils to remove. It is not the coils that misbehave but we cannot just remove the load because the coils form part of the output filter (LC) that may damage the chip if the load is removed. This is an inconvenience compared to class AB amplifiers.
You will have to connect the coils again when the fault is found and corrected.
 
#19
FauxFrench said:
If it is the channel with the cross that misbehaves, these are the two coils to remove. It is not the coils that misbehave but we cannot just remove the load because the coils form part of the output filter (LC) that may damage the chip if the load is removed. This is an inconvenience compared to class AB amplifiers.
You will have to connect the coils again when the fault is found and corrected.
Click to expand...


Ok..fauxfrench...I understood bit...your intention is to check the main ic output but we can't remove the load while checking..isn't it? anyway I have few questions to ask

1) should I have to remove coils while suppling current to the board?

2) if not why you said I have to remove one end first and go to other end of the coil?

3) when I go through the circuit diagram if I remove coil one end there is no supply to the speakers..so that definitely it will not popup..so what the purpose of doing that?

4) can you tell me what is the next processes then I can follow you without your presence in online can communicate result so then you can advise based on the result..isn't it? otherwise I have to wait and see until your arrival☺

Thanks lot buddy to your support...

best regards,
indika
 
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#20
FauxFrench said:
If it is the channel with the cross that misbehaves, these are the two coils to remove. It is not the coils that misbehave but we cannot just remove the load because the coils form part of the output filter (LC) that may damage the chip if the load is removed. This is an inconvenience compared to class AB amplifiers.
You will have to connect the coils again when the fault is found and corrected.[/QUOTE

Douglas Blake said:
Rather than pulling parts off the board, it would make more sense to try it with dummy loads of known quality first ... get some 8 ohm 1 or 2 watt resistors to use in place of speakers, then play music at very low levels to test.

From your initial description I would think you've either got a short some place or you have a power supply that isn't up to the job.
Click to expand...

Hi Douglus blake...

Thanks for the advice..yes I can sense you and the idea behind you given..use a dummy load.isn'tit?..but I have no idea of checking the board functionality.. as I said in start of the discussion..I have used laptop charger 19v 3.3A power rated 65W. But the issue is I have this popping issue even without any load. one channel is starting to popup just after supply voltage. I have double check the external shortages and nothing wrong.
any idea?
thanks
indika
Click to expand...
 
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