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Android Noob
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115 Posts
I wonder if it's possible to solder on the 64g chip to the mother board and everything work. Anyway you can provide a picture of the internal memory?

I have some soldering skills but would like to see what I would be working with

Edit: never mind this idea is just crazy. The new Samsung 64g internal chip just went into production and who knows if the chip would be compatible with the 7

Sent from my Galaxy Nexus using Tapatalk 2
 

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Android Apprentice
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121 Posts
Discussion Starter · #23 ·
I wonder if it's possible to solder on the 64g chip to the mother board and everything work. Anyway you can provide a picture of the internal memory?

I have some soldering skills but would like to see what I would be working with

Edit: never mind this idea is just crazy. The new Samsung 64g internal chip just went into production and who knows if the chip would be compatible with the 7

Sent from my Galaxy Nexus using Tapatalk 2
I've stated this earlier, you can't mess with the memory chip, i'ts surface mount. you WILL kill the N7 trying to mess with it. You need special machines that do a process called solder flowing or reballing. in the simplest form i can explain, it's like having a river of molten metal or solder, the part rides above it as the componets that need to be soldered touch and travel up the part bonding it to the circuit board. it's like tryinng to add more memory to a onboard chipset on a motherboard. it's next to impossible. the next problemis software, firmware and so on are all configured to that chipset in there. you can't just ad memory. lastly the goal is to com up with a way to do this that normal people on here can do or have other people do for them. in basic terms, a quick down and dirty way to add memory. i want to get in and get out without breaking the unit. i beeen looking into a way of modifying N7's configuration forcing it to install from the play store to the memory card. i saw a few xperia articles with ADB command re routing the install directory to the memory card auto matically. so i may have a way to make it treat it like expandible memory. I do have pics of my solder attempts btw but I wanted to upgrade my N7 and post a collection all t once instead.
 

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Android Beginner
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21 Posts
would it be possible to make a switchable cable that could operate as an otg cable/charge cable extension? if so someone could build that into a case, sure it would have a little more length at the bottom bezel but it would be pretty sweet to have a usb port built into a case.... just pondering
 

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Android Apprentice
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121 Posts
Discussion Starter · #25 ·
would it be possible to make a switchable cable that could operate as an otg cable/charge cable extension? if so someone could build that into a case, sure it would have a little more length at the bottom bezel but it would be pretty sweet to have a usb port built into a case.... just pondering
This is actually super simple. There is essentially 4 wires for usb and the otg adds a extra ground so it's detected like it is. You have 2 options, a double pole throw switch that severs the data connection or a single pole throw switch that disables the secandary ground, ether one wuld reseult in a switch for charge and a switch for data. the problem here is a the case. cyurrently I have not seen a case that has space to hide a otg cable.

Quick update, I been tracking down my 16 gig, i finally got a order n at gamestop then they got backordered till August 31st. So now I'm on the hunt , then staples came instock with free shipping so i ordered it in i will have mine by friday. I miss my tablet dearly. So in 24 hours i went from my Galaxy nexus to a Razr maxx to a Galaxy S3 then purchased a N7. Talk about trading up.
 

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802 Posts
Man it really sounds like you know what you're doing, and if it can be done it seems like you're the man for the job.

I gotta come out and say it, tho- I was wondering how quick you'd be to crack open that nexus and risk its life, lol. I'm not blaming you for holding off til you're ready- hell I wouldn't even think of risking mine.

But I'd love to see this idea come to fruition. Good luck on your mission.

I did not mean for that to rhyme. I'll try not to do it next time.

Edit: nyuck nyuck. Sorry, its really early and I'm sitting in my car bored to death.

Sent from my Galaxy Nexus using Tapatalk 2
 

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Android Apprentice
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121 Posts
Have you considered just using a usb drive instead of a microsd reader? They make some very small usb drives, like the verbatim tough and tiny. 32 gigs, and the chip itself may actually be smaller. Just a thought.
I think you're missing the point i'm stuck at. To put things in perspective, the N7 has no room for anything, you can't run wire even under the back cover, there is just no room. the only gap is between the audio jack and case. there is enough space to fit a micro sd reader. There are 2 goals by going this route. you don't need to resolder to upgrade the chip in the future. 2 you will never make a usb drive as thin as the reader is, this reader all flattened out is almost thinner then 2 micro sd cards layed on top of each other. that's pretty thin.

On to the hurdles i'm stuck at. a viable Data point to tap into , i'm going to use the power pins or pogo type plugs for power, i need to find a better data connector point though. then it's solved.

To answer about how long before i go under the hood. well maybe a week after i get it, should arrive friday. my biggest thing is digging for schamatics and pinouts to accomplish the goal. then i'll go diving in. also i don't want to rip out all that glued down copper shielding , i'm sure it would be a nightmare to re assemble. This is becoming more of a pet project though. I'm famillar with backwards re engineering when i put a wii controller inside a snes controller, that took a long time to figure out due to space constraints. but i built it. it's just a matter of finding a soloution then simplifying it and making a practicle use. so that anyone can solder one in with practice.
 

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Android Androgyne
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773 Posts
I love this idea, but I couldn't trust myself to open my baby up and mess with her intestines.

now if you were to tell me how to replace the USB end of an SD card reader with a micro USB plug for USB OTG use....I'd pay very, very close attention.
 

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Android Apprentice
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121 Posts
Discussion Starter · #33 ·
Np, quick update : i been going through helll trying to get a good N7 It's sold out damn near everywhere till the 30th or so. I got my hands on 2 one from stables but it had a loose screen and massive light bleed. I canceled a preorder at gamestop to wait for that crap. So gamestop sold mine and i found a 16 gig at walmart. I picked it up and as i'm opening it in the car, sealed stickers and all the damn thing has fringer prints under the plastic on the glass, looked like someone ate a doughnut and played with my N7 I was pissed. So the back even had glue residue like a sticker was stuck to it. I powered it up , all looked good but when i activated at home i found a defect in the very tip top right in pitch black lifht. it's like someone put a flaw in my Lcd. it's not noticible in normal use but noone has one, so i'm stuck for a little while, I'll continue my research though and hopefully have a answer soon. Asus make more of these things, wear gloves , eat less dougnuts !
 

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Android Apprentice
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121 Posts
Discussion Starter · #39 ·
Very nice and clean, try tapping the pogo pins for power then maybe u could try tapping data theough the usb. I been working long days as lead tech so i havent had any free time. great progress though.
 

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I tried a similar arrangement with my Nexus 7, but opted to put the microSD card reader where the rear camera would have gone instead of the space beside the headphone jack (my second choice). I have a 64GB microSD and since the back cover is easily removable, I decided that I didn't need to cut a hole in the cover. I also wanted the Nexus to look completely stock. I was able to solder a small ribbon cable from an old laptop to the pins on the back of the microUSB port, which connected to my microSD card reader. Using a Dremel, I had to grind away a small part of the mid-frame around the rear camera hole to fit the reader, but was able to close the cover with everything in place. Unfortunately, I ran into the same problem with the OTG setup not working when the power cord was plugged in. So I've been looking for an alternate 5V source.

I checked the Con3 pins with a multimeter and found the following:
There are 24 pins on Con3, and pins 1,4,7,11,13,19,20 and 23 are grounds.
Pin 2 and 3 are 1.77V and pin 24 is .11V.
There is no 5V source.


I'm considering simply tapping into the 7.4V lead from the battery and using a 5V voltage regulator like this one:
http://www.radioshac...oductId=2062599
The downside is that is would draw a small amount to power, even when the tablet is turned off. There's also the issue of finding the space to fit the regulator. My other option is just to keep checking pins for 5V.

 
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