Problem and Solution:When I first attempted to get a WTV020-SD-16P to work, I like many people had issues. I tried several board and several 1/2GB microSD cards, until eventually it worked, but not sure what the magic was, put it down to voodoo.The Problem:However a discovery (from a like minded builder) is that the SD Card Pin 6 (on the board) is not properly connected. The Spec (for Pin 6) says that it should be connected to GND, but it isn't!!! at least not in the boards that we tested. The solution:The solution is to connect a wire from Pin6 of the SD Card socket to Pin 8 (GND) of the sound module. As I said I cannot take credit for discovering this. See this post showing the wire that was added.http://www.tonymacx86.com/imac-mods/130197-mactester57s-imac-g5-17-a1058-model-7.html#post986109And here is the same modification I did to my own boardhttps://www.dropbox.com/s/ncp4wbbuirimjem/IMG_3512.jpg?dl=0The question is: Is this a design/production fault present in all boards? or just isolated to some boards?Can anyone test their boards, by using a multimeter to check for continuity between Pin 6 (SD) and Pin 8 (module), and report back ?If after making this modification can anyone report success with SD cards other than the limited once that are known to work ?Thanks.
So you think you fixed it after adding GND to the SD card or you are not sure what fixed it? Can you disconnect the GND wire and check if it still works?
Hi kiwisincebirth,So you think you fixed it after adding GND to the SD card or you are not sure what fixed it? Can you disconnect the GND wire and check if it still works?thank you.
It is hard to remember how and when it was initially. I purchased a WTV module and a single (sands) 2GB SD card, and could not get it to work. I then purchased a second module, and a 1GB (sandisk) card. It was at this time I finally got it to work. Then I soldered the wire, and now every combination of card and module work for me. I actually don't want to undo the soldered wire to re-test further, that would be a backward step (for me)If someone was stuck in the position where they couldn't get it to work, if they tried this, then I was hoping for them to report back here. I don't have any other no-name SD cards (that I can find) to test it on. And also I have seen post saying that the SD can can be rendered inoperable (killed) by inserting into the module.The issue that was discovered (no GND connection to the SD), should actually mean that the module could never work, somehow it manages to work with the Sandisk cards is an electrical miracle. See also this post, where the information came from. http://www.mikrocontroller.net/topic/345527#postform<German Site - See Post in December 2014>31 12 1GB