View Single Post
Banned | Posts: 3,412 | Thanked: 1,043 times | Joined on Feb 2010
#30
Originally Posted by joerg_rw View Post
The D+/- pins are correct but missing any ESD protection, so are not exactly a replacement for the USB receptacle contacts. Refer schematics, V5301 and Z5300 - the D+/- pad shown here are the J5300/1 testpoints. Using these without the ESD protection from those components may cause damage to the chips that interface to the USB.

Same applies for 5V VBUS: correct pad but a lot of missing protective gear:
F5300 2A fuse
N5300 reverse polarity (and OVP?) prot diode
C5300 100nF feed-thru capacitor to filter spikes and RF
C5301 27pF capacitor to further filter RF
L5300 choke to filter ripple and spikes
the pad itself seems isn't shown in schematics

For fixing a broken USB receptacle there are definitely better ways than using those pads. I think it's been some thread here that had a photo of a fixed USB that used short wires to contact to Z5300 and F5300 inside shielding can next to receptacle. To fixate the receptacle component you can use 2-component glue if the mech support pads are also gone.

ID pin you'll probably not really miss, as it's basically useless for a micro-B-USB-F - it's a OTG thing and N900 can't do OTG. H-E-N doesn't need ID


The D+/- short for fastcharge is specified as a simple short. No need for any resistor.

One last thing: Battery minus is NOT GND! Don't use it like that

HTH, click thanks if it did
jOERG
Sorry to dampen your mod but for the above reasons it is just not a good option and wow a hell of a lot of work to this when all you need to do is open it up and repair the usb port properly, this takes away the risks of this mod and the wires hanging out everywhere.

Lets face it once you even touch a Nokia device with a soldering iron the warranty is gone anyhow so better to open up and do the job properly !.

PS and if i am not wrong this mod will bypass the charging circuit and not a wise move at all.

Last edited by abill_uk; 2011-06-09 at 02:20.