소개
While the rest of the world awaits in awe for the unveiling of the iPad, we've got our hands on the newly released iPad 3G.
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필요한 것
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The much awaited iPad 3G is finally in the hands of iFixit!
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The Wi-Fi + 3G iPad. We got a sneak peak of the internals of this tablet a month ago by poking around on the FCC's database.
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The 3G iPad is visually distinguished from its Wi-Fi-only sibling by a black plastic RF window.
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The 3G iPad supports UMTS/HSDPA on 850, 1900, and 2100 MHz and GSM/EDGE on 850, 900, 1800, and 1900 MHz.
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In a dramatic shift for Apple, the iPad is unlocked, and not tied down to a specific carrier.
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Alas, in the US, AT&T is the only carrier that operates 3G on frequencies the iPad supports. T-Mobile should work, but only on the slower EDGE network.
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The iPad's model number is A1337 as previously suggested by the FCC filing. Yes, we think that's l33t.
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There's no use wasting anymore time, let's see what makes this puppy growl.
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We'll be comparing the internals of this production unit to the preproduction FCC photos we exclusively unveiled a month ago.
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이 단계에 사용된 도구:Metal Spudger$2.99
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After some careful prying around with a metal spudger, the display assembly can be removed from the rear case.
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이 단계에 사용된 도구:Spudger$3.99
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Pry up the antenna on the communications board with a plastic opening tool. This is one of two antennas on the communications board.
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The communications board is secured by T4 Torx screws.
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Upon removing the screws, the communications board slides out of its socket on the logic board. The connection socket style is similar to a Mini PCI Express card.
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Removing the micro-SIM card. That's a really small SIM card!
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The iPad's SIM card measures 12mm x 15mm. That's just under half the size of the standard size SIM card from an iPhone 3GS.
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You could cut up a full-size SIM card and turn it into a Micro-SIM. The contacts are fully compatible.
The pin-out for a SIM and micro SIM are the same. You could cut down a full size SIM to fit and it would work.
Holland Rhodes로 부터 인용:
The pin-out for a SIM and micro SIM are the same. You could cut down a full size SIM to fit and it would work.
Yup pin-out, clock-speed, etc., are the same; I don't think there's been a SIM whose chip was larger than the contact area for over a decade, so be gentle with a sander, sand the @*%^*^! down, and voila.
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New to the 3G iPad, there's an antenna attached to the backside of the display assembly. The copper foil piece seen in the picture connects to the silver metal LCD frame. Apple has cleverly used this same piece of metal for both structural and electrical purposes.
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Use the flat end of a spudger to pry the SIM card slot off the rear case.
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It sure doesn't look like Apple was tight on space. As far as we know, the only purpose of this board is to connect the SIM card to the logic board.
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Comparison between the iPad 3G's (left) and the iPad Wi-Fi's (right) logic board.
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When comparing the two models, the top half of the Wi-Fi's rear case has copious amounts of open space.
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Lift the cellular antenna from its housing.
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The cellular antenna remains.
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From left to right: the Wi-Fi/Bluetooth, GPS, and 3G antennas, respectively.
Francis로 부터 인용:
Please, where exactly is the A-GPS chipset on the com. board?
It's the Broadcom part in the top-left of the board, to the left of the Skyworks chip.
Kyle Wiens - 답글
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The 3G board with A4 processor.
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The second shot is the main board from the Wi-Fi iPad.
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Key differences?
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The most obvious change is the addition of the connector on the right side of the board for the communications board.
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More subtle is an additional small IC above the A4 chip next to the connector for the GPS antenna. This may be a signal processor, but we can't firmly identify it: T3J 927 632567.
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Bottom of the main board.
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Nothing much to see here, it's exactly the same as the Wi-Fi board.
Check out the copyright dates between the two boards. Perhaps this indicates the 3g version took longer to work out - which would explain the later release date
The later release date had to do with FCC clearance IIRC.
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Apple soldered the EMI shield onto the communications board, making it challenging for us to show you the chips. Despite this adversity, we pressed forward undaunted, fearlessly unsoldering the board to reveal to you:
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Infineon 337S3754 PMB 8878 X-Gold baseband IC 5Y06115. This part had the Infineon logo in the pre-production unit, but Apple has white-labeled it to obscure the manufacturer. This is the exact same baseband processor as the iPhone 3GS.
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Skyworks SKY77340 Power Amplifier Module
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Three Triquint power amplifier / filters.
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Infineon U6952
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Numonyx 36MY1EE
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Along the right are three TriQuint power amplifiers: TQM616035A, TQM666032B, and TQM676031A. These are the same three chips that Apple used in the iPhone 3G nearly 2 years ago.
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Broadcom A-GPS BCM47501UBG F01003 P11 949871 SN
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Bottom of communications board.
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The second photo is from the pre-release FCC unit. The bottom of our board has additional part number markings, but is otherwise identical to the pre-production unit.
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It's important to note that the Broadcom A-GPS package is on the communications board, explaining why the Wi-Fi-only iPad does not have GPS.
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That wraps up this teardown of the iPad 3G.
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Don't forget to take a peek at its cousin, the iPad Wi-Fi Teardown for more iPad related mayhem.
What I'm truly curious about is adding 3G to a WiFi-only iPad. Would it be possible just to attach the extra required parts to the logic board?
Brandon Papworth로 부터 인용:
What I'm truly curious about is adding 3G to a WiFi-only iPad. Would it be possible just to attach the extra required parts to the logic board?
Most likely not. You would need to do some low level software stuff to get it recognised. Also, don't forget that the "PCI-e like" connecter isn't actually on the WiFi model, so you'd be hand soldering a custom connector (where would you source it) - or bypass the connector - and either way be hand soldering on a complex chip. You'd have to buy each edition of the iPad anyway, to examine the pinouts to know where to do it.
Ollie Ford - 답글
Is there conformal coating on all of the parts or in just certain areas?
Jean로 부터 인용:
Where is the hard drive? Anybody try installing a bigger hard drive?
There is no standard HDD. It's flashed based solid state memory like on the iPhones which means you can't upgrade it.
Jean로 부터 인용:
Anybody know if you hook up and external HD through the usb adapter, if it will read it?
The way it says it reads your camera strongly suggests it simply supports USB Mass Storage over that USBHost, so technically in hardware and even drivers it should be able to. Whether it can do anyhting more with the data in software than pull photos off it is another issue.
Jean로 부터 인용:
Ok, so its not upgradeable but its shock proof. Anybody know if you hook up and external HD through the usb adapter, if it will read it?
Someone has worked that out with some jail broken software. It's just not very easy.
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Unless T-Mobile is now offering micro-SIM cards. AT&T still has the exclusive on this Apple device.
thecreative - 답글
As far as I know, the "micro" is only in the sorrounding area of the "electronic" part, so, correctly cut-out big-SIMs will be converted to micro-SIMs.
Luis Alejandro Masanti - 답글
That and their 3G frequencies are incompatible.
Frank - 답글
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it's very simple, so, HP and Google can soon make two low cost clones with webOS and ChromeOS
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gaetano marano - 답글
I can really see a lot of user cutting down their SIM cards to fit. Very practical. Let me know when someone actually does this.
thecreative - 답글
you can make your own microsim...
instructions for all SIMs (standard size) are here:
http://www.touchuserguide.com/2010/04/05...
Stefan Williams - 답글
Great article and images.. There's definitely rooms for a USB port haha
guybrush - 답글
Yea right... And also clone iPhone OS?
Rimsky Sucre - 답글
tmobile now has microsim but no more 3g
Meow Purr - 답글