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| 2 diode burnt? http://forum.hddguru.com/viewtopic.php?f=10&t=19572 |
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| Author: | positivebit [ May 31st, 2011, 17:22 ] |
| Post subject: | 2 diode burnt? |
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? Attachment: DSC_0165.JPG [ 402.25 KiB | Viewed 8021 times ] Attachment: DSC_0166.JPG [ 1.15 MiB | Viewed 8021 times ] |
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| Author: | Cleanroom [ May 31st, 2011, 17:50 ] |
| Post subject: | Re: 2 diode burnt? |
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. |
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| Author: | positivebit [ May 31st, 2011, 17:53 ] |
| Post subject: | Re: 2 diode burnt? |
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) |
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| Author: | Vulcan [ May 31st, 2011, 18:07 ] |
| Post subject: | Re: 2 diode burnt? |
positivebit wrote: i opened and i found the (diode?) burnt a) C14 Hint - a diode PCB marking would not start with "C"  positivebit wrote: b) no text but it's possible to see from the pictures. I would trace the PCB tracks to identify the likely function of that component - but it looks the same type as "C14". positivebit wrote: Any idea if both are simple diode? 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? |
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| Author: | fzabkar [ May 31st, 2011, 23:19 ] |
| Post subject: | Re: 2 diode burnt? |
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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| Author: | networkpc3000 [ June 6th, 2011, 0:50 ] |
| Post subject: | Re: 2 diode burnt? |
i can handle this case. do you need any help? |
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