Thread: [Thread Closed][Pre-Pre-Pre Announce]Black Aluminium replacement body & backcover for N900
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guylhem is offline guylhem
2012-05-01 , 18:49
Posts: 40 | Thanked: 25 times | Joined on Sep 2011
#79
Originally Posted by Estel View Post
I can't promise anything, but I'll check what is possible - in meantime, could someone - fluent in reading N900's PCB schematics - check, if for 100%, testpads +5V and mass comes through same safety elements as USB charging? I'm sure about USB data lacking only common-mode choke, but about power lines, it's unverified info for now.
I am not fluent with the PCB schematics but I have them open and trying to figure out.

About USB testpads, do you have informations not present in the schematics ? On page 4 testpad J5300 and J5301 (USB D+/D- seems to be *before* ESD protection.

Regarding +5v, J2061 which is usually identified as 5v in the pictures is nowhere to be found on the schematics.

I guess I will have to follow the traces on a scan of the PCB - this may be where you have checked D+ and D-? (but I don't know how to "connect" the 2 sides to follow J2061)

BTW It was reported the 2A fuse is missing from 5V but I have not checked that yet - http://talk.maemo.org/showpost.php?p...6&postcount=74

EDIT: Also, if using J2061, a switch or an optocoupler for D+/D- might be needed so that the N900 enters charging mode, as indicated in http://talk.maemo.org/showthread.php?t=72753

I'm thinking of a simpler solution : a Reed switch, and leaving a magnet when the N900 is charging.
Last edited by guylhem; 2012-05-01 at 19:12.
 

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