ProtoDAC TDA1387 X8 project

[hifinet]

If there is static only in one channel, the problem is not the three I2S resistors. First try to resolder the left channel I/V resistor (connected to pin 25 of the module) connection to ground. The ground pad connects to the ground plane, and the pad needs a lot of heat to properly flow the solder to the pad. Add some flux to remove any corrosion from the lead or pad. Heatsink the I/V resistor lead on the topside of the PCB to protect it.

If this does not help, it is possible that a single chip in the module is bad. Sometimes cold spray can temporarily help, and that can be useful to identify the bad chip. Sometimes pressing on each chip with the eraser end of a pencil can identify the bad chip. There could be a bad solder joint there. Also, as a test, use a ground probe and connect to each of the chip pin 7. This should reduce the volume level of that chip. If the static decreases, you found the bad chip.

Due to tariffs, the Chinese market for the modules has unfortunately dried up. Hopefully, this will change in the upcoming months.