Stupid question: The clicking, it's not fault of any cap? Maybe in the LDO for 7V (if you hadn't modded) or in the opamp device its self? Also, if current draw rises depending on the file, maybe CPU current is dropped .... causing malfunction of decode those files.
Cold vs. hot device won’t matter (again, if this theory is true
). The temperature—when it stabilizes—is just an approximate proxy of the AKM power consumption.
Fully agree: caps and LDOs would definitely play a role if power supply voltage drops are the issue. Slightly higher capacitors and/or slightly lower-drop LDOs could be enough to solve the problem. But one would have to experiment to find the right mod! I don’t have the AK4499 version, so I’m just guessing here!Stupid question: The clicking, it's not fault of any cap? Maybe in the LDO for 7V (if you hadn't modded) or in the opamp device its self? Also, if current draw rises depending on the file, maybe CPU current is dropped .... causing malfunction of decode those files.
In my case, I did not notice this clicking, maybe because my 660s are not sensitive as yours. The heating device did I spot is this (5V LDO) :
You can find here more info about it
And where is this voltage regulator in the ak4497 version?Fully agree: caps and LDOs would definitely play a role if power supply voltage drops are the issue. Slightly higher capacitors and/or slightly lower-drop LDOs could be enough to solve the problem. But one would have to experiment to find the right mod! I don’t have the AK4499 version, so I’m just guessing here!
Edit: if I remember correctly, the DSD (single) Ak4497 5V LDO was a problem. Power supply coul drop low enough to cause the LDO to stall and not regulate 5V. Since the LDO is also used as a Vref for the DAC, in effect it was commanding the DAC to lower its gain, creating perceived distortions. Changing the LDO for a better one (lower drop), or adding capacitors on the PS, or increasing the PS voltage slightly, were good solutions to fix the problem. The AK499 DSDs may have a similar issue…
Thank you very much
I had the ak4499 you can see marked in red 5v orange 9v white DAC, blue lpf stage, purple buffer green opamo
This is what I can see through. I will start with the capacitors and the heat sink Yes, for a start. ThanksI had the ak4499 you can see marked in red 5v orange 9v white DAC, blue lpf stage, purple buffer green opamo
@abheybir are you sure that is the lcd cracked or the digital board is in short?Need little help, while experimenting with different opamps I accidentally broke the screen. Please guide a bit regarding the replacement screen. I have the first gen of the device.
Yes, the LCD pannel is cracked, it turn on but there are some fine lines in the display and I felt that panel shattering sound when I was handling it. I tried searching on ebay/aliexpress but not able to find any replacement panel. The attached picture is just for reference of model as currently the device is not with me.
I got some spare parts. Let me check if any works and I send you a PM, meanwhile you could check (when you get the device) which model of LCD is.Yes, the LCD pannel is cracked, it turn on but there are some fine lines in the display and I felt that panel shattering sound when I was handling it. I tried searching on ebay/aliexpress but not able to find any replacement panel. The attached picture is just for reference of model as currently the device is not with me.
