Develop Bugs

are these for external antenna?

When you open up the back cover, you see these 3 ports (W1, W2, R1)... are they for external antennas? is so is it possible to buy a antenna to boost 4G reception inside buildings?
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http://forum.xda-developers.com/showthread.php?t=878034
looks like they are for antennas but I'm not sure anyone has figured out how to use them. I would love to know, my biggest complained about this phone is its horrible wifi reception.
---------- Post added at 08:36 AM ---------- Previous post was at 08:30 AM ----------
actually nevermind maybe not: http://forum.xda-developers.com/showpost.php?p=8363821&postcount=53

Was curious about this as well.
Between those two threads it seems like some people think they're antenna connectors, others think they're for QA testing. They look just like the antenna connectors on a laptop wifi card, but that's just looks.

Somebody on the Nexus S 4G forum tried soldering a paperclip into his, to boost signal, and it ended bricked the radio. Apparently the radios are extremely sensitive to the impedance of the antenna and will easily burn out if it's lengthened.

strung said:
Somebody on the Nexus S 4G forum tried soldering a paperclip into his, to boost signal, and it ended bricked the radio. Apparently the radios are extremely sensitive to the impedance of the antenna and will easily burn out if it's lengthened.
Click to expand...
Click to collapse
I'd love to see him explain that to Sprint if he returned it, lol.

strung said:
Somebody on the Nexus S 4G forum tried soldering a paperclip into his, to boost signal, and it ended bricked the radio. Apparently the radios are extremely sensitive to the impedance of the antenna and will easily burn out if it's lengthened.
Click to expand...
Click to collapse
I used to work for Agilent/HP and those are called MMCX (micro mini connectors) used for high frequency signals (I'm talking high high as in microwave technology) - so yes you are correct they are very sensitive but I think what caused the brick of the radio is that the paperclip touched the conductive pin to the ground (the area around the pin). I wouldn't know what these connectors do unless we get a schematic of the PCBoard but I definitely wouldn't experiment around LOL

does aluminum back cover or case >> interrupts the phone signal ?

to my opinion it must kill the signal
any experience at this issue ?

Yes there are post in here that state the likes of GPS dead or takes very long to lock on, once they take off the metal cover and replace original one its ok.

While GPS reception seems to be worsened by the metal back cover GSM/UMTS reception is not affected since the antenna is situated at the bottom of the phone. This is the actual spare part containing the loud speaker and antennas sitting underneath the bulge:
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Further notice that not all covers are wholly made from metal. As you can see from theses photos some still have a plastic frame with a metal plate attached.

inquisitor said:
While GPS reception seems to be worsened by the metal back cover GSM/UMTS reception is not affected since the antenna is situated at the bottom of the phone. This is the actual spare part containing the loud speaker and antennas sitting underneath the bulge:
Further notice that not all covers are wholly made from metal. As you can see from theses photos some still have a plastic frame with a metal plate attached.
Click to expand...
Click to collapse
While I do not have any GSM/UMTS reception problems outdoors or in public areas, I did experience some loss of reception quality when I'm at home. I sometimes experience 'a circle with a cross' sign, no bars at all. Though this problem only recently happen to me after I upgraded to Gingerbread 2.3.4 just days ago. When I was on 2.3.3 and have the metal back on, I did not see any reception problem when I'm at home.
Anyone have similar problem with 2.3.4?

yup, i can confirm no signal degradation for me, stll not test the gps though...

Recently I received a metal battery cover from eBay seller "easytradingco" which I repeatedly tested for its impact on reception in three different locations (balcony, office room, kitchen).
My conclusion is that there's a slight impact on UMTS/3G-reception reducing signal strength by ~5dBm with the metal cover attached (I made sure the phone was always connected to the same NodeB, which is 2km away from me and - at least on the balcony - in line of sight)
Interestingly WiFi-reception seems to be slightly improved by 2-3 dBm with the metal cover attached.
However GPS becomes nearly unusable with the metal cover. On each test run I gave the phone 3 minutes to get a satfix with AGPS data updated immediately before. Even outdoors (on the balcony) I couldn't get a satfix with only a single satellite found after 3 minutes, while with the original cover it took 10 seconds to detect 9 satellites of which 6 provided a signal strong enough to determine my position.
That said I wouldn't buy a metal cover again as it renders GPS unusable and also impacts UMTS-reception slightly.

Teardown Samsung Galaxy Tab S 8.4 SM-T705

I just couldn't stand to do that.
Still, the official purpose is one too long pin (marked with red on last photo), which deforming the back housing cover.
Has got to cut it down a bit.
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Thanks for it.
<pedantic>
blank strings but no blank bar codes and qr code.
</pedantic>

Just to make sure; so you dont separate the white back cover between the from the bronze and the cover but between the bronze rim and the glass front?

OP, did you cut the long pin? Also, was it easy to pull off the screen from the back cover? I may try this because there seems to be a slight bump coming up from my T700.

It looks to me like the usb port is a separate module which is good news. In the past i've had to repair these by desoldering and replacing, which is not any easy task due to their minute size.

Hi, I've got some questions. Not precisely about the deformation, though. Hope its not an issue.
I've got this issue. Battery draining even while the tablet has been turned off (completely off - turned off via the software button that comes up via long press on the power button).
Amongst other things, I suspect that the power drain has something to do with the antenna's on the back cover. Anyone know what those antennas are for? They say stuff like LTE and WiFi however, I've taken off the back cover and its still connecting to mobile data and wifi etc. So these may be extra antenna's etc.

bluetooth and gps need antennas as well though some can share.
John.
ozaq1 said:
Hi, I've got some questions. Not precisely about the deformation, though. Hope its not an issue.
I've got this issue. Battery draining even while the tablet has been turned off (completely off - turned off via the software button that comes up via long press on the power button).
Amongst other things, I suspect that the power drain has something to do with the antenna's on the back cover. Anyone know what those antennas are for? They say stuff like LTE and WiFi however, I've taken off the back cover and its still connecting to mobile data and wifi etc. So these may be extra antenna's etc.
Click to expand...
Click to collapse

Hi the little white cord above the camera is missing from my tab. What is it?

Motorola's solution for back cracking with metal bands - picture

Hi,
I came across this interesting picture, where you can clearly see that the metal bands from Motorola have a plastic piece/adapter that fits inside the watch. Even the larger 23mm bands have this piece from what I can see, their first part is in fact narrower than 23mm and fits inside this adapter.
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The original article is here: http://www.slashgear.com/gold-moto-360-hands-on-lets-talk-smartwatch-luxury-06354400/

Let's hope they release the adapter separately so we aren't forced to buy the $80 band if we want a metal one

After looking at multiple photos, none are detailed enough, but it looks like the plastic adapter is actually a spacer since the metal band is much smaller where it connects with the watch itself...disappointing, in order to use this spacer, the leather bands would have to be changed to fit at the initial connections on the watch...narrow them down and then widen them out like the metal band.

is it just me or does the watch on the right look like its got some issues with the back?

640k said:
is it just me or does the watch on the right look like its got some issues with the back?
Click to expand...
Click to collapse
Yes, it looks like hairline cracks are creeping around from the adapters...might be a reason there are no high detailed photos on the web.

Here's a High res of the watches. You can clearly see the spacer if you zoom in.

Dusty Rhodes said:
Here's a High res of the watches. You can clearly see the spacer if you zoom in.
Click to expand...
Click to collapse
i've seen the spacer in the press release. here's the thing, unless there's some magic trickery holding that spacer in place, it's still putting pressure on the back. the spacer would basically occupy the entire space which means the back would effectively hold it in (or rather stable, since the pin is holding it in place).
i take it back. the spacer is formed with a lip "resting" against the back part. seems like they're using it as a buffer/spacer.

Help with LG G3 Homemade heat sink

After seeing this for the Optimus 4X (http://forum.xda-developers.com/optimus-4x-hd/general/guide-homemade-heatsink-easy-to-make-t2971385), I decided to try one for the G3.
I covered most of the back part (except the sd slots, camera, etc.), and although the heat still felt similar (when touching the power/vol. buttons), the games didn't lag/stutter as much (I'm assuming it's cause of thermal throttling).
However, one problem I'm experiencing is the GPS problem. The foil made it impossible to get a GPS lock (and I had to rip the foil out while I was driving and lost, thus no pics ). Furthermore, I tried Googling, but couldn't find information about where the GPS module is located on our phone.
Can someone help with:
(a) Trying it out and confirming that the heat sink really works and isn't just a placebo effect on my side,
(b) Locating the GPS module so we can hopefully work around it?

In regards to b, the GPS is on-die with the CPU, as seen here (In the most obvious place in my opinion, the site of the manufacturer xD)
https://www.qualcomm.com/products/snapdragon/processors/801
Qualcomm decided to put everything into one package so it's not spread throughout the phone and decreases overall size, so yes the GPS is with the CPU and almost everything else
If you watch any teardown video, you will see that the CPU/System die is exactly in the middle of the phone, right behind the lock/unlock and volume rocker. So keeping a nice square cut-out of the aluminum foil should let all the signals pass through, but then you won't have the heat being transferred from the CPU, only from around it so the CPU might still heat up :/
TL;DR: Not really much you can do because the GPS is on the CPU unfortunately :/

That graphic (from the Qualcomm site) is more an infographic than an actual layout of the cpu. Aside from that, it's only the GPS logic circuitry that's on the chip, not the GPS antenna. That graphic shows a camera on chip, too, but we all know the actual camera isn't located on the chip.
What matters for the OP is where the GPS antenna is located. That's shown in the image below, from the Anandtech web site: http://www.anandtech.com/show/8169/the-lg-g3-review/9
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