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HP 50g & SD Cards: Performance, Format, Notes
09-03-2016, 08:59 AM (This post was last modified: 09-03-2016 09:26 AM by Vtile.)
Post: #83
RE: HP 50g & SD Cards: Performance, Format, Notes
You did check if the resistors aren't foult? Especially the last one you took? I personally would try to trace the route to IC from the last resistor R68? you desoldered to see if there is foulty connections / bad resistors.

Also are you positively sure you actually were testing WP as write protect detection and not CD card detection? As from NXP aplication note (you have propably already read it) they say as follows "Additionally card holder can provide mechanical switches for card detection (CD) and write protection (WP) mechanisms. "

That said, I'm disappointed I always thought that the switch is actually mechanical device to cut the trace inside the card. *Meh* it is only a wimpy software lock.

Just shooting blind, I even have not opened my device.
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RE: HP 50g & SD Cards: Performance, Format, Notes - Vtile - 09-03-2016 08:59 AM

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