HI to all!
What problem?
look photo!
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| SD 2GB BADS http://forum.hddguru.com/viewtopic.php?f=10&t=10022 |
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| Author: | sempre [ September 30th, 2008, 9:30 ] | ||
| Post subject: | SD 2GB BADS | ||
HI to all! What problem? look photo!
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| Author: | pcimage [ September 30th, 2008, 10:34 ] |
| Post subject: | Re: SD 2GB BADS |
You have a controller problem by the look of it. Nand chip needs to be removed and the data decoded. Either myself or Bosse (mr_spokk) can almost certainly do this for you. Sean |
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| Author: | dick [ September 30th, 2008, 13:15 ] |
| Post subject: | Re: SD 2GB BADS |
Yes maybe a controller or firmware problem. I would still reflow the memory chip/chips themselves before removing them as just one dry joint can cause exactly the same symptoms. |
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| Author: | Vulcan [ September 30th, 2008, 14:07 ] |
| Post subject: | Re: SD 2GB BADS |
The original photo shows just sector 0 is unreadable. Depending on how many sectors are unreadable in total, then as well as possible dry joints & controller faults mentioned already, I've also seen this where (after reading the NAND chip directly) I found exactly one _physical block_ on the flash chip (often 128kB) was erased i.e. every byte (including spares) in that block = 0xFF. IMHO, that could be a flash controller firmware bug, where it had erased the block and then not programmed it (or, perhaps, a power-failure occurred between those 2 stages) - so those are other possibilities. Difficult to say with the limited data provided... |
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| Author: | Amarbir[CDR-Labs] [ September 30th, 2008, 16:16 ] |
| Post subject: | Re: SD 2GB BADS |
Hi , Please REsolder The Nand Flash And the MCU ,check For The Voltage Regulators and then make sure that crystal is actually working by a frequency meter in a scope or multimeter |
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| Author: | dick [ October 1st, 2008, 3:06 ] |
| Post subject: | Re: SD 2GB BADS |
Sorry but I think it appears I misunderstood your post and that you have a SD memory card................your options are VERY limited as the advice I offered before will not be of any use with this device. 
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| Author: | sempre [ October 1st, 2008, 17:34 ] |
| Post subject: | Re: SD 2GB BADS |
Thanks all helps! All sectors bads! |
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| Author: | Amarbir[CDR-Labs] [ October 1st, 2008, 18:41 ] |
| Post subject: | Re: SD 2GB BADS |
dick wrote: Sorry but I think it appears I misunderstood your post and that you have a SD memory card................your options are VERY limited as the advice I offered before will not be of any use with this device. Sorry i also Did , Well Boss You Have No option Other Then To Buy a Nand Flash Reader And Then Using Dedicated Software Reconstructing the read nand flash ,and if the nand flash cannot be read then nothing can be done |
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