hi
i have more then a dozen sd card readers .. al made by siyotem ..
it works ok and after left un unsed for few weeks /months .. it wont work ..
i have tried cleaning the contacts . but to no luck . tried soldering the contacts .. no luck .
could it be that the ics are programed to go broke after some specific number of uses ?
or could there be any part on it that could go broke.. how to test and repair it..
no physical damge has happened to it . they would be working ok .. before being stored in closet in closed plastic box where there is no moisture etc.
on some card readers the led on card reader would glow and windows would detect them in device manager and the corresponding drive will be shown in my computer but it is shown as 0 bytes and cannot be opened/explored ..tried in linux as well.. on others card readers (they also lack any crystal etc o their pcb ..) they dont even show up in device manager and neither their led comes up ..
i am suspecting the crystal to be the issue .. is there any way one could test it ? some realy cheap dirty method .. ?
i am posting it in repair section to get some clue regarding repair not an advice to buy a new one as these are cheap .. oh btw i do have a new one .. whenever it is not working i buy new one .. but this time i want to repair those dead as well ..
this is the card circuit board
http://www.instructables.com/answers/How-to-fix-card-reader/
i have more then a dozen sd card readers .. al made by siyotem ..
it works ok and after left un unsed for few weeks /months .. it wont work ..
i have tried cleaning the contacts . but to no luck . tried soldering the contacts .. no luck .
could it be that the ics are programed to go broke after some specific number of uses ?
or could there be any part on it that could go broke.. how to test and repair it..
no physical damge has happened to it . they would be working ok .. before being stored in closet in closed plastic box where there is no moisture etc.
on some card readers the led on card reader would glow and windows would detect them in device manager and the corresponding drive will be shown in my computer but it is shown as 0 bytes and cannot be opened/explored ..tried in linux as well.. on others card readers (they also lack any crystal etc o their pcb ..) they dont even show up in device manager and neither their led comes up ..
i am suspecting the crystal to be the issue .. is there any way one could test it ? some realy cheap dirty method .. ?
i am posting it in repair section to get some clue regarding repair not an advice to buy a new one as these are cheap .. oh btw i do have a new one .. whenever it is not working i buy new one .. but this time i want to repair those dead as well ..
this is the card circuit board
http://www.instructables.com/answers/How-to-fix-card-reader/
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