replacing USB interface in DAC?

[lasercut]

I have a Topping D50 and it appears the USB interface was damaged, its turns on and plays fine over SPDIF but isnt detected with USB input.
Replacing it with something like this to fix it would be good , it looks it may even be an upgrade over the original interface with the added ''CPLD'' chip... whatever that is.

The traces from the internal USB interface to DAC chips are already marked on the D50's PCB - LRCLK, DATA, and BCLK. this matches with the markings on the interface PCB linked above.


Is it as simple as connecting them up?
The D50 uses dual 9038Q2M chips but there is no seperate traces from interface for either chip for left and right data, will the new interface ''know'' this?

 

[Markw4]

Probably it would work. But, before connecting up the new interface you would need to disconnect the old interface. That might involve cutting PCB traces, and patching the new interface onto the cut traces. Otherwise you might be shorting signals coming from two different places together. Besides the three signals you would also need to connect up a ground.

If you have any way of testing, it could be that existing USB connector for the old interface simply has one or more cracked solder joints where it attaches the PCB. Sometimes things break due to mechanical stresses, other times not. A little troubleshooting with an oscilloscope and or multi-meter might be worthwhile before doing surgery on the board traces to patch in a new interface.

Regarding distinguishing left and right data, that is what LRCLK is for. Correct operation of the two dac chips for left/right operation would be configured in firmware.

 

[lasercut]

Probably it would work. But, before connecting up the new interface you would need to disconnect the old interface. That might involve cutting PCB traces, and patching the new interface onto the cut traces. Otherwise you might be shorting signals coming from two different places together. Besides the three signals you would also need to connect up a ground.

If you have any way of testing, it could be that existing USB connector for the old interface simply has one or more cracked solder joints where it attaches the PCB. Sometimes things break due to mechanical stresses, other times not. A little troubleshooting with an oscilloscope and or multi-meter might be worthwhile before doing surgery on the board traces to patch in a new interface.

Regarding distinguishing left and right data, that is what LRCLK is for. Correct operation of the two dac chips for left/right operation would be configured in firmware.

thanks i will try it out