I've tested the WTV020 modules this week. They are one of the worst pieces of j..k I've eve seen. It took me about one week to get them up and running... The modules have a nice "QC passed" sticker on it, but they all have a serious hardware issue and will never work! Solution: running a wire from PCB GND to SD slot pin 6 (it's floating in original condition!!). This issue even ki..ed my first no-name SD card... Fortunately the genuine SanDisk 2GB cards survived! The second issue is, that they don't tell you, that the micro SD card needs to be re-formatted with 32kb cluster size (FAT format, used my old Shuttle mod with Windows Vista)...
At the moment I'm testing the module with the PAM 8403 amp and the original speakers.
MacTester