Hi there,
We received this not detected USB 2.0 flash drive for data recovery and have serious reasons to think that the resistor at location R25 could be missing.
Does anyone have this board model and could take a good quality picture of the resistor, or tell us the resistance value?
Attachment:
File comment: C20V-2.0-SM3257EN-L48-2L
-1F (LGA TSOP)-1.0
flash_drive_SM3257EN.jpg [ 142.9 KiB | Viewed 7188 times ]
-1F (LGA TSOP)-1.0
flash_drive_SM3257EN.jpg [ 142.9 KiB | Viewed 7188 times ]
Circuit board:
Code:
C20V-2.0-SM3257EN-L48-2L
-1F (LGA TSOP)-1.0 2011-02-25
-1F (LGA TSOP)-1.0 2011-02-25
Controller: Silicon Motion SM3257EN
Attachment:
File comment: R25 location on C20V-2.0-SM3257EN-L48-2L
-1F (LGA TSOP)-1.0 board
flash_drive_with_resitor_torn_off.jpg [ 133.97 KiB | Viewed 7188 times ]
-1F (LGA TSOP)-1.0 board
flash_drive_with_resitor_torn_off.jpg [ 133.97 KiB | Viewed 7188 times ]
Reasons for us to think that a resistor at R25 is missing:
- Under the microscope, the resistor at R25 appears having been torn off: the weld is not smooth but abrupt shaped.
- The customer told us the flash drive was intermittently working during some time when he pressed on it.
- Another picture of the same circuit shows the presence of a resistor at R25: http://www.datasheetcafe.com/wp-content ... EN-DI1.gif
Unfortunately it is too blurry to allow reading the resistor value (if printed on it). - There are no other apparent damage and replacing the USB connector does not bring anything.
On the shell, one cannot read the brand name anymore and the customer cannot remember it, but likely a popular model from Emtec or so.
Attachment:
File comment: Plastic shell from C20V-2.0-SM3257EN-L48-2L
-1F (LGA TSOP)-1.0
shell-from-flash-drive.jpg [ 15.74 KiB | Viewed 7188 times ]
-1F (LGA TSOP)-1.0
shell-from-flash-drive.jpg [ 15.74 KiB | Viewed 7188 times ]
Thank you for your kind help.
