Help identifying the chip.

[maxslo]

My Enermax Aeroodio stopped playing sound thru one speaker, from what i was able to conclude, this chip doesn't provide any output to the left speaker circuitry, (right one is working as supposed to).


Does anyone have an idea what this chip might be? Enermax only describes it as "DreamBass Soundchip", and searching it by the markings yielded no success :/

Thanks in advance Badcaps Gurus

[budm]

Re: Help identifying the chip.

Can we the pictures of the whole board?
So you have verified that the power amplifier circuit for the non-functioning speaker is OK?

[maxslo]

Re: Help identifying the chip.

I'll take it apart again tomorrow and take a photo of the complete board from both sides
Yeah i did. everything up to that chip seems to work as supposed to.

[Chungalin]

Re: Help identifying the chip.

IC is a TQFP-48 package, but I can’t identify maker.

[maxslo]

Re: Help identifying the chip.

Ok, so here are the photos of the board

[Khron]

Re: Help identifying the chip.

And how exactly did you conclude that main microcontroller is at fault?

Those two SOIC-8 packaged chips seem to be the power amps, according to the (chinese-only) datasheet. If anything, i'd kinda rather be suspecting those, assuming shoddy contacts aren't the issue.
That, or crapped-out pots...

[madan1]

Re: Help identifying the chip.

I've seen dozens of that single-chip-audio-solution in mp3 players, fm transmitters, cheap amps, etc.
Usually they are the last thing to fail. If you trace back the signal paths you will easily find the output pins of the chip.
First check:
speaker connections
speakers
volume pot(s)
and after that the preamps and the processor.

[maxslo]

Re: Help identifying the chip.

I've already ruled out the speaker and speaker connection.

the first thing i did was swap around the speakers,
both worked fine in the right side,
but neither worked when pluged in the left side connector.

After that i grabbed a multimeter and checked voltages for right and left side,
nothing seems to reach the amp on the left side iirc, i'll check again to be sure.

volume pot? as in potentiometer? haven't thought about checking that, i'll do that, thanks

[maxslo]

Re: Help identifying the chip.

Geez, looks like i did a bad job last time,
it seems that it actually is the amp that isn't working,
any simple way of testing it and is there any drop in replacement that is perhaps available in eu,
the only TC6805 that i've found are from aliexpress

[madan1]

Re: Help identifying the chip.

Check the power - if TC6805 is actually Ltc6805 ( http://pdf1.alldatasheet.net/datashe...R/LTC6800.html ) there should be +/-5V on pins 4 and 8.
Then you can check if there is input audio signal from the processor ( by oscilloscope or headphones ).
And if the voltages and the signal are OK, then replace the amp.

[Khron]

Re: Help identifying the chip.

Even simpler, you can compare pin voltage readings with the chip on the "good" side

[maxslo]

Re: Help identifying the chip.

Check the power - if TC6805 is actually Ltc6805 ( ) there should be +/-5V on pins 4 and 8.
Then you can check if there is input audio signal from the processor ( by oscilloscope or headphones ).
And if the voltages and the signal are OK, then replace the amp.

Nope, not the same, completely different pinout than on the TC6805.
Yea, the working one gives me voltage between pins 5 and 8,
the faulty one doesnt give anything.
Other pins are the same on both chips.

Edit: i've found chips with same pinout, except for the input, all of the available chips have a + and - inputs, this TC6805 chip only has one input. :/
https://cdn.badcaps-static.com/pdfs/...8b14e1e912.pdf
https://cdn.badcaps-static.com/pdfs/...a0676c58ba.pdf

Any chance i can make it work with something like this?

[Khron]

Re: Help identifying the chip.

Completely different pinout, and completely different device

In the datasheet i linked earlier, in-between all the chinese characters, i see mentions of EMI and PWM, which would lead me to believe there's a good chance the TC6805 is in fact a compact BTL class-D amplifier. That's pretty much confirmed seeing the fSW = 350kHz in the parameter table on page 2.

[maxslo]

Re: Help identifying the chip.

My bad, those were SOIC-8 i need SOP-8,
So something like this could work?
https://cdn.badcaps-static.com/pdfs/...9a689b8df6.pdf

Edit: ah ok, so it's best if i just buy a couple of these from china and keep as a spare in case they decide to die again sometime :P