I hope I have posted in the right area.
I bought a dac hat for my RPi4. I fed it 24V when it was on the Pi, causing a bit of smoke.
I replaced the Pi, put the hat back on, but it is not working.
I am planning to change each component, and see whether I can resurrect it.
The one chip that has no id is the chip marked as the I2S chip.
I am wondering if anyone has any idea of what this chip is? it measures 4x4mm.
Thank you in advance.
I bought a dac hat for my RPi4. I fed it 24V when it was on the Pi, causing a bit of smoke.
I replaced the Pi, put the hat back on, but it is not working.
I am planning to change each component, and see whether I can resurrect it.
The one chip that has no id is the chip marked as the I2S chip.
I am wondering if anyone has any idea of what this chip is? it measures 4x4mm.
Thank you in advance.
Attachments
24V will have fried every active component on both boards instantly I suspect. Over-voltage is savage in its effects.
If there is a voltage regulator between the 5 V input and the rest, you might have only fried the regulator. If not, it's probably hopeless.
Many years ago I built a circuit for an aunt of mine that was supposed to be supplied from a wall wart. At some moment, due to miscommunication, she had the wall wart replaced with a mains plug. The only parts that needed to be replaced were some diodes, an electrolytic capacitor and a voltage regulator, everything behind the regulator survived.
Many years ago I built a circuit for an aunt of mine that was supposed to be supplied from a wall wart. At some moment, due to miscommunication, she had the wall wart replaced with a mains plug. The only parts that needed to be replaced were some diodes, an electrolytic capacitor and a voltage regulator, everything behind the regulator survived.
I know I made a mistake with the power supply voltage thru the unit.
I thank everyone for their input.
However, does anyone have any idea what this component could be?
I thank everyone for their input.
However, does anyone have any idea what this component could be?
It uses a clock oscillator and seems to be used for DoP decoding, probably a CPLD or FPGA. If that's the case, you're out of luck, unless you can get the firmware.
OK, thanks. Your answer needs digesting.
I thank you for your insight.
Would you have any examples of these chips you are suggesting?
I thank you for your insight.
Would you have any examples of these chips you are suggesting?
They are both programmable logic.
CPLD = Complex Programmable Logic Device
FPGA = Field Programmable Gate Array
so while I could link you an example of both, but it would ultimately be of no use to you, as it is the 'program' in programmable, you will be left wanting. the idea is, it is programmable logic hardware, used to leverage hardware speeds against a software task and you dont have the software.
CPLD = Complex Programmable Logic Device
FPGA = Field Programmable Gate Array
so while I could link you an example of both, but it would ultimately be of no use to you, as it is the 'program' in programmable, you will be left wanting. the idea is, it is programmable logic hardware, used to leverage hardware speeds against a software task and you dont have the software.
If it is a CPLD or FPGA, it is an exotic part, because if you check all Xilinx, Altera and Lattice portfolio, you will not find a QFN28 packed one.
Edit: I forgot to mention Microchip - same situation - no QFN28 packed CPLD or FPGA chip.
Edit: I forgot to mention Microchip - same situation - no QFN28 packed CPLD or FPGA chip.
Thanks for your replies.
I see now what the problem is.
I plan to change the transformer and see what happens.
Otherwise, I think this adventure has come to an end.
Thank you all.
I see now what the problem is.
I plan to change the transformer and see what happens.
Otherwise, I think this adventure has come to an end.
Thank you all.
You won't be replacing that AK4118 because you can't buy these ICs right now.
Like Marcel said, either it's only an LDO that is dead or the whole board is basically dead.
Like Marcel said, either it's only an LDO that is dead or the whole board is basically dead.
Good call, maybe something simpler - pic32mx1xx series. Comes with i2s interface. Still needs programming.
Check the wiring on the circuit board, such as the QFN32 package version of CT7302. I am also using this chip.
https://www.comtrue-inc.com/index.php/download2?task=download.send&id=20&catid=5&m=0