from this 1 gb pen drive there was a burnt strong smell.
i opened and i found the (diode?) burnt
a) C14
b) no text but it's possible to see from the pictures.

Any idea if both are simple diode?

you can try and buy an identical one and try swapping the bad diodes (assuming that no other diode/resistor is bad), or you can send to a professional. a professional will probably only charge 200-300 to extract the data from the chip manually.

hi - did u try to enlarge the pictures, are u sure they are just diode ?
it's a no-name pen drive so i would like to shortcut them (assuming that a bad usb port made this burn - and that they are diode)

Hint - a diode PCB marking would not start with "C"


I would trace the PCB tracks to identify the likely function of that component - but it looks the same type as "C14".


Not diodes - at least not "C14"; I would need to spend more time tracing the PCB to check the other burned component. Do NOT short-circuit them, as you suggest later.

What does the customer say was the cause - was there a possible overvoltage?

I agree with Vulcan regarding the circuit tracing.

Usually when an electrolytic capacitor fails catastrophically, the cause is an overvoltage, or reverse polarity. There appears to be a 3.3V linear regulator (U6) between the USB port and the controller and flash memory. Hopefully it will have limited the damage. I can't read its markings, but a typical pinout would be Input (+5V) - Ground - Output (+3.3V). I would clean the affected area with a toothbrush and isopropyl alcohol.

Datasheets:

OTi-2168, Ours Technology Inc., USB 2.0 FLASH DISK CONTROLLER, 3.3V:
http://www.datasheetarchive.com/pdf/get ... pdf&scan=n

K9W8G08U1M, Samsung, 3.3V, 512M x 8 Bit / 256M x 16 Bit NAND Flash Memory:
http://www.datasheetcatalog.org/datashe ... 215_DS.pdf

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i can handle this case. do you need any help?

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