Editing N900 Hardware Hacking
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J2000 J2060 | J2000 J2060 | ||
J2062 + o o o o o o | J2062 + o o o o o o | ||
- | + | o o o o o o + J2061 | |
J5602 J3109 J3111 J3113 J3115 | J5602 J3109 J3111 J3113 J3115 | ||
- | o o o o | + | o o o o + + + + |
- | + | o o o + + + | |
J3110 J3112 J3114 | J3110 J3112 J3114 | ||
</pre> | </pre> | ||
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According to [[User:jacekowski|jacekowski]]s [http://img36.imageshack.us/i/teki.png/ measurements] J2000 is serial console, | According to [[User:jacekowski|jacekowski]]s [http://img36.imageshack.us/i/teki.png/ measurements] J2000 is serial console, | ||
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- | + | pin 5 is TX (confirmed by jacekowski ([[N900 Hardware Hacking/serial dump|115200 8-N-1]] ~2.6 V, connected to 1st UART in omap - <code>/dev/ttyS0</code> in Linux), and r00t (see below)) | |
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+ | pin 2 is RX, according to r00t | ||
+ | Since J2000 is group of 5 pads one could suppose the serial console uses HW flow control. | ||
<pre> | <pre> | ||
+ J5301 | + J5301 | ||
+ J5300 | + J5300 | ||
- | J2000 | + | J2000 J2060 |
- | J2062 + | + | J2062 + GND RX 1 o o 4 |
- | + | 5V o TX 5 o 7 + J2061 | |
J5602 J3109 J3111 J3113 J3115 | J5602 J3109 J3111 J3113 J3115 | ||
- | 1 o o 4 | + | 1 o o 4 + + + + |
- | 5 o 7 | + | 5 o 7 + + + |
J3110 J3112 J3114 | J3110 J3112 J3114 | ||
</pre> | </pre> | ||
(confirmed by >><r00t|home> anyway... here's the actual TxD now: http://www.constancy.org/~r00t/IMG_9246.JPG << | (confirmed by >><r00t|home> anyway... here's the actual TxD now: http://www.constancy.org/~r00t/IMG_9246.JPG << | ||
[[Image:testpoints_tx.jpg]] | [[Image:testpoints_tx.jpg]] | ||
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>><r00t|home> <r00t|home> this is serial loopback: http://www.constancy.org/~r00t/IMG_9251.JPG<<) | >><r00t|home> <r00t|home> this is serial loopback: http://www.constancy.org/~r00t/IMG_9251.JPG<<) | ||
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===External antennas=== | ===External antennas=== | ||
- | On the N900 there are three | + | On the N900 there are three [http://en.wikipedia.org/wiki/Hirose_U.FL Hirose U.FL] connectors. These Hirose U.FL connectors were noted as test connectors however with the right equipment attached these can be used to increase the range of the said chips that has such connectors attached, if not to increase range it can be used possibly in other ways. |
- | The three chips that | + | The three chips that has Hirose U.FL connectors attached are: GSM, GPS and Bluetooth/Wireless LAN. Note that the Bluetooth/Wireless LAN share the same Hirose U.FL connector. |
- | However there are some restrictions imposed on accessing these test connectors. The first restriction is that it seems GSM's | + | However there are some restrictions imposed on accessing these test connectors. The first restriction is that it seems GSM's Hirose U.FL connector is the most easily accessible as it is on the underside of the N900's PCB (where one can see those solder pads when the battery is taken out of N900). Access to Bluetooth and Wireless LAN's as well as GPS receiver's Hirose U.FL are on the obverse side of that N900 PCB. |
The next set of limitation is to find appropriate adapters/converters and possibly attached with a cable as allows the converted adapter's head to be placed in a location where one prefers to have the head placed. Hirose U.FL is noted best to not be used in a manner that one connects and disconnects the cable constantly (~50-200 cycles) so that would leave the most appropriate solution is to get an adapter/converter. | The next set of limitation is to find appropriate adapters/converters and possibly attached with a cable as allows the converted adapter's head to be placed in a location where one prefers to have the head placed. Hirose U.FL is noted best to not be used in a manner that one connects and disconnects the cable constantly (~50-200 cycles) so that would leave the most appropriate solution is to get an adapter/converter. | ||
- | + | Most common adapter/converter would be a Hirose U.FL connector -> [http://en.wikipedia.org/wiki/RP-SMA#Reverse_polarity_SMA RP-SMA] as these can be commonly found in various setup, furthermore SMA connector itself would have a longer wear than Hirose U.FL itself along with the fact that there are many antennas available in the form of RP-SMA connector form. With the cable attached and if one prefers the connector to be attached to the back of the device, this highlights the issue noted beforehand with the connectors on the obverse side of the device. | |
Also it is worthy to note that the size (in diameter or thickness), grade and length of the cable would also impede on the quality of communication. Too thin of a cable would make the transmitted/received signal be more susceptible to other interference, the same goes with too long for a cable would also make it more susceptible. Too thick of a cable especially if used on the obverse side of the device makes the cable unable to be able to loop around to the other side of the PCB should the owner want the actual head of the connector to be on the same side as the GSM connector for instance. | Also it is worthy to note that the size (in diameter or thickness), grade and length of the cable would also impede on the quality of communication. Too thin of a cable would make the transmitted/received signal be more susceptible to other interference, the same goes with too long for a cable would also make it more susceptible. Too thick of a cable especially if used on the obverse side of the device makes the cable unable to be able to loop around to the other side of the PCB should the owner want the actual head of the connector to be on the same side as the GSM connector for instance. | ||
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* N900 Service Manual - Level 1&2: [http://www.mediafire.com/?ndmjylkj4wk MediaFire] or [http://maemoworld.org/wp-content/uploads/2009/12/Nokia_N900_RX-51_Service_Manual_Service_Level_1_2 Maemoworld] | * N900 Service Manual - Level 1&2: [http://www.mediafire.com/?ndmjylkj4wk MediaFire] or [http://maemoworld.org/wp-content/uploads/2009/12/Nokia_N900_RX-51_Service_Manual_Service_Level_1_2 Maemoworld] | ||
- | * N900 Service Manual - Level 3&4: | + | * N900 Service Manual - Level 3&4: [http://torrentpump.com/download/n900-rx-51-sm-l3-4-pdf-5228583 Torrent], [http://rghost.net/679258 rghost] or [http://rs768.rapidshare.com/files/314490131/N900_RX-51_SM_L3_4.pdf RapidShare] |
* [[N900 Hardware Schematic]] | * [[N900 Hardware Schematic]] | ||
* A teardown with [http://techblog.gr/mobile/nokia-n900-teardown-08635/ some pics] from Greece, and a video of reassembly. | * A teardown with [http://techblog.gr/mobile/nokia-n900-teardown-08635/ some pics] from Greece, and a video of reassembly. |
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