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Ok so heres what I got so far. This will be a work in progress since I need a collaberative effort so I don't destroy my new N7.

So what are we starting with? a 8 gig N7

The goal? internally install a micro Sd card 32 gb with upgrade to 64 gb in th future.

Why? Because I can.

Questions i need answered,

Will it charge? It's a tough call, i need more hardware info first

Will this void warrenty? you betcha

Will this risk destroying my tablet? OHHHH yea Experts only!

Do you need drivers? No , This should work just like OTG but internal, using the App Stick Mount.

My background is a huge collection of controller building modding, console building and so on.

So what's the game plan? Take a micro sd card reader, strip it then solder it into the Usb plugs data and power connections. By doing this I feel I would bypass any jumper needs for charging or switching since the card will not physically occupy the slot.

So drop your thoughts below, Scroll down fro pics on progress and thoughts.










From IFixit, the usb micro port i need to solder into.

Update 7/28::

Did you think this was dead? NAhhhhhhh

I been busy getting my health in order and waiting on my OTG for testing

Progress::

Heres some of the biggest issues i have been figureing out and i've solved just about all.

I've decided on Cat 5 ethernet type of wire for my solder joints, this should keep everything thin since there is no room inside for anything extra.

I've decided to place the sd card just behind the audio jack, this should provide enough room without damage to anything.

forum member Snow02 has been a big help so far in testing mounting and charging configurations, it looks like the Sd card will mount but not charge while mounting, but unmount qand it charges, this works fine for me since i don't plan to be ever plugged in with the sd mounted. I won't fully know till I solder in it. This could be a kernal issue that can be solved with software i'd have to assume, I'm not a Dev so I can't be sure.

Also i'm trying to find out if you can force apps to install to a stick mounted Sd card, it be a great help if someone can input on this since it's my final hurdle.

Once this is solved i can up the 8 gig nexus to a whoping 32-64 gig permantly.

Stay tuned !
 

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Discussion Starter · #5 ·
I'm pretty sick , I came down with tonsilitus last night, so doctors tomorrow but i'll see what I can do when i'm better.
 

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Discussion Starter · #10 ·
WEll I been away but I did recieve my new soldering Iron and Went at it, It's too delicate to solder to every usb pin. I tried and if i went any further i'd destroy the N7. The connector is a fine line, u have to balence, heat flux and solder. the connectors are bonded to wire which is sandwiched between plastic. get it too hot and it will melt. On to the pogo pins. I noticed the pogo pis are 4 pins so technically that would be the USB interface. without a pinout though I can't be sure, i have tried to hold the usb wires on them and mount but no luck yet. I plan to tinker with it. I am better now but need surgery. thanks for the wishes,i'll keep everyone updated when i get into it more.
 

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Discussion Starter · #13 ·
POGO pins are: +5v, audio right, audio left, ground (not in that order) so there's no data transfer there
see i'd normally agree with this but there are 4 pins not 3 looking at the accesories. I'd guess there is data included in the N7 On the Galaxy nexus i'd say yes to what you say being there is 3 pins.

As to replacing the chip, it was my first thought, but it's playing with fire, there is no native hardware replacement support, it's surface mounted. I don't have the technology or machinery to re suface mount a chip if i wanted to. Have you seen the internals? there is just not a hell of alot you can do.
 

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Discussion Starter · #16 ·
Yeah you're absolutely right, it's a surface mount, no "legs" coming out from it on all sides. I didn't notice that detail. I recall people bumping their iPods from 8 to 16 (or higher) a few years back and thought that might apply here as well. Well in that case I am rooting for you even more!
i'm pretty young {25} i've had my hands in 360 modding, gamecube, wii, wii controller rebuild , i've yet to share anywhere, and even the ipod era, most people bumped Mini's or classic gen. you could take a mini and upgrade it by like 20 gigs cause it used compact flash carts , like the ones found in DSLR's. all they did was open the mini, unplug the old drive, plug in the new and restore with itunes. Same went for classic ipods since they had Hdd's shared with Zunes you could unplug, plug in another and be upgraded.just restore in itunes. I had a brainstorm last night, i'm thinking maybe tap power for pogo pins then data through usb. i may be able to dual charge and mount this way. i would also freee up some space to wire to the connectors. I may give it a try tonight.

Btw my N7 has no damage or solder globs inside, rest assure it'snot being tortured.
 

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Discussion Starter · #18 ·
I been beat from my job but after i nap tonight , i'm off tomorrow so i plan to go under the hood. got any links on where the header location might be? i'm thinking maybe tap pogo pin's power then data from another location. a one last shot at it, i may try wrapping wire, it's as thin as a human hair but a nightmare to solder.
 

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Discussion Starter · #20 ·
A minor update, :: I sold my N7 today for what i paid plus my shipping cost. I have a chance to buy the 16 gig locally so i'm going to upgrade. Don't worry too much, i'm not abandoning the idea, just taking a break to beef up my soldering skills with wrapping wire then i'll attack it head on. expect like a 2 week break. On another note, anyone else who may want to attempt this or needs input I'll gladly help. A little advice for anyone wanting to attempt this. you'll need Flux for small electronics, a Rosin core solder really fine. You'll need a super fine solderiron. your best bet would be a Weller pencil solder iron, it's like 16 watts. anything bigger or more watts you will destroy the nexus 7 connections.
 

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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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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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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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Discussion Starter · #30 ·
so you want the male end of a usb card reader to go to the male end of a mirco usb plug? like a otg adapter but hardwired to a reader?
 

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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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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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[sub]
There's no power output from the pogo pins. There's a ground, right and left speaker outputs and a power input.
[/sub]
[sub]I was wondering about that, i kept hearing the pogo pins feed stuff but it made no sense to me. Well only thing left as said is a 5 volt source, my guess the speakers feed .5 to 1.5 volts so thier out, the screen might take 5 volts to run. I don't get it though. if you tapped say the pogo pin ground and kept the 5 volt source from the usb ribbon cable connector then the ground would remain constant and not chage. my understanding of OTG and charging is the ground switches due to charging mode from a ground to a neutral. that then turns off otg but enables charge. by keeping a different ground, that should fix the issue.[/sub]
 

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Discussion Starter · #45 ·
It's 2 am i have to work at 8 am i just wrapped up a 10 hour day without a lunch or break. i feel the pain.
 

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Discussion Starter · #49 ·
couple of reasons, its a constant draw on the battery and finding a reguator that small can't be a easy task. I got worf, i have to have surgery next wed, i probably will be away for 2 weeks or so from this thread. good luck guys.
 

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thanks guys, i'll still check in till around tues or so surgery is on wed.

i almost forgot, as for the tiny card readers i got mine on ebay for around 2-4 bucks. look up "micro sd card reader mini".
 

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something intresting i noticed was that the samsung tab 7 inch is a spitting image of the nexus 7, same form factor, same buton layout, same beveled edges, the samsung has a camera and a IR blaster. it's 250.00 with a dock. not a bad deal.one was returned at work the other day so i glanced over it. now onto the point. I can almost hinge bets they use the same board with different plugs. the golden ticket is probably in the FCC records disclosed of the devices. probably if you pull thos schematics, youll have most of the answers.to all the comments about before diodes, i highly suggest you pop the cover or research some pictures. damn near half of the N7 is surface mount stuff. you need a damn needle to solder onto that stuff. with public tools you wouldn't be able to do much, with commercial technology you'll sink 2 times the value of the tablet into it just for a sd card slot. i encourage development but practicality guys. were looking for a simple connection that's feesable for everyone with solder skills to do. I'd say nail down a solid source to enable usb first, then work out host and charge functionality. lets be honest, you'll never need to charge and watch movies more then the life on the tab. it kills me when i read about it, you should easily be able to get through 2 movies before needing a charge.so whats the hassel in adding all these other road blocks? lastly Hdmi out isn't even capable if yet or ever will be. so why worry about a charge right now and host? one more thing if you need storage and charge so bad, just move the file with Root Explorer to internal temporarly.
 
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