[MrTasselhof]

This thread is for the discussion of the Internal Components for the Gemei G9.
Link: Merimobiles.com - Gemei G9

---

Pictures

 01-PortSideOpened.jpg (145.66K)
Number of downloads: 384  02-BottomSideOpened.jpg (148.55K)
Number of downloads: 442
 03-OpenedFullView.jpg (473.41K)
Number of downloads: 530  04-OpenedMainView.jpg (524.45K)
Number of downloads: 528
 05-Motherboard.jpg (2.46MB)
Number of downloads: 560  15-Motherboard-Back.jpg (2.13MB)
Number of downloads: 456

---

Chipsets

Motherboard: INET-3F-REV02-2011-12-17-ZGC
Capacitive Touchscreen Controller: ??
Processor: AllWinner A10
- http://rhombus-tech.net/allwinner_a10/
Flash Storage: 2x Micron 29F64G08CBAAA
- http://www.techpower...913&postcount=2
RAM: 4x Hynix H5TQ2G83CFR
- http://www.hynix.com...p=computingDDR3
Wireless: Realtek RTL8188CUS
- http://www.realtek.c...nn=4&ProdID=274
Battery Management: AXP209
Sound: Built-In to A10 Chip

 06-I202-29F64G08CBAAA-NANDFlash-x2.jpg (116.78K)
Number of downloads: 223  07-Hynix-H5TQ2G83CFR-DTLD12263-RAM-x4.jpg (38.7K)
Number of downloads: 138  08-AllWinner-A10-C1051BA-2221-Processor.jpg (152.13K)
Number of downloads: 103  09-FE1.1s-LG3L836B5012-USB2.0Hub.jpg (45.89K)
Number of downloads: 95  10-AXP209-G1006CA-3H1-PowerManagement.jpg (30.82K)
Number of downloads: 99  11-Realtek-RTL8188CUS-C1E04HI-GC02-WirelessLAN.jpg (116.56K)
Number of downloads: 109  12-LotsOfEmptyRealEstate.jpg (329.42K)
Number of downloads: 117  13-INET-3F-REV02-2011-12-17-ZGC-Motherboard.jpg (209.37K)
Number of downloads: 127  14-DPT-300-L3456B-A00_VER1.0-TouchscreenController.jpg (212.51K)
Number of downloads: 123

[MrTasselhof]

Opening the device...
It is not too difficult or risky, but should still be taken under your own risk and caution.
Basically there are two screw to remove on the ports side.
Then it is a matter of finding purchase to lightly pop the metal backing from the plastic edging tabs.
- I used a guitar pick with some light flexing/shifting around the edges once I got it started.

General Notes that I see...

1) Very similar build/components to the Aurora (expected)
2) This thing has the biggest battery I have seen to date.
3) a Lot of extra real estate for chips that aren't in there... wonder what they could put in there?

Overall a pretty solidly built tablet!

Tasselhof

[LVL]

What I noticed:

- Dual speakers (expected a single speaker...)
- DPT flexible pcb. I think I've heard of this company before...
- The usb hub chip. I thought it would be attached directly to Allwinner SoC.(already to many usb ports used by the wifi/camera?)

MrTasselhof, on 20 March 2012 - 12:32 PM, said:

3) a Lot of extra real estate for chips that aren't in there... wonder what they could put in there?

I really wonder why they would put the 'touchscreen'-chips on the flexible pcb instead of the normal pcb.
Maybe to upgrade the touchscreen-chips more easily in the future?

This post has been edited by LVL: 20 March 2012 - 02:35 PM

[davidtb]

Thanks Tass!!

[MrTasselhof]

davidtb, on 20 March 2012 - 03:55 PM, said:

Thanks Tass!!

It's what I do ;P

Although some devices get and deserve more attention
It becomes easier to read when a tablet is going to be popular and has great potential, so you try a little harder.

It is funny though... it use to be that finding a tablet that can play my 1080P videos was a challange/good sign... now that is nearly a given/minimum.
I will have to figure out what the next "High Class" tier/problem to surmount.
Screen quality has also dramatically improved with IPS and again will soon be become the minimum/standard.

I think that could easily be Facebook games, but the only issue is that I don't think that hardware is solely or even the major issue.

One big thing that these tablet makers need to grasp and commit to is added Bluetooth by default.

Tasselhof

[MrTasselhof]

LVL, on 20 March 2012 - 02:27 PM, said:

What I noticed:

- Dual speakers (expected a single speaker...)
- DPT flexible pcb. I think I've heard of this company before...
- The usb hub chip. I thought it would be attached directly to Allwinner SoC.(already to many usb ports used by the wifi/camera?)


I really wonder why they would put the 'touchscreen'-chips on the flexible pcb instead of the normal pcb.
Maybe to upgrade the touchscreen-chips more easily in the future?

I also noticed there are two additional speaker connection solder points (on the lower left side)... so I wonder if you could actually have 4 speakers in this bad boy...
I may try/solder them as I have some parts lying around

Tasselhof

[smithmal]

Mr. T,

What are your thoughts about the Gemei's wireless adaptor (Realtek RTL8188CUS)? I don't know enough to know if one type of wireless adapter is preferred over another, but I do know that sometimes Chinese manufacturer's try to cut corners on stuff like this. A tablet with a bum antenna is almost a useless tablet.

smithmal

[LVL]

MrTasselhof, on 20 March 2012 - 04:28 PM, said:

I also noticed there are two additional speaker connection solder points (on the lower left side)... so I wonder if you could actually have 4 speakers in this bad boy...
I may try/solder them as I have some parts lying around

Tasselhof

Hmmm, I wouldn't do that if I were you...
I study Electrical Engineering. I warn you, if this is not the case, you might end up making a short circuit.(speakers are just 4-16 Ohm, so almost no resistance)
And you might blow up your speaker because of dc voltage...
If you make a picture of the solder points, I might be able to tell you if you should do it or not...
If the solder points are parallel to the other speakers solder points then you can probably add a speaker, but you might overload the audio amplifier. This overloading is not that bad and the audio amplifier probably has an build-in overload protection by turning itself off.
If you want to test the parallel connections:
- turn tablet off
- check with multimeter for short circuit or low resistance (nearly 0 Ohm)

smithmal, on 21 March 2012 - 05:38 PM, said:

Mr. T,

What are your thoughts about the Gemei's wireless adaptor (Realtek RTL8188CUS)? I don't know enough to know if one type of wireless adapter is preferred over another, but I do know that sometimes Chinese manufacturer's try to cut corners on stuff like this. A tablet with a bum antenna is almost a useless tablet.

smithmal

I am not Mr. T, but I can probably answer it for you

It's not the realtek chip you should be worried about. The chip is almost perfect.
It's the design around the chip + antenna placement.
I think the design shouldn't be a problem, but the antenna on the other hand...
Realtek RTL8188CUS is a very standard chip, it is used A LOT in all sorts of electronics.
You have a 99.9% chance that your computer contains a realtek chip, either audio, ethernet, wifi or something elso.
Chinese manufacturer's don't have to cut corners if it uses such a popular chip. It is cheap already
About the antenna: make sure the antenna is placed in such a way that it has a non-metal material around it's placement.
Metal blocks out most high frequency signals.

This post has been edited by LVL: 21 March 2012 - 06:55 PM

[MrTasselhof]

LVL, on 21 March 2012 - 06:46 PM, said:

Hmmm, I wouldn't do that if I were you...
I study Electrical Engineering. I warn you, if this is not the case, you might end up making a short circuit.(speakers are just 4-16 Ohm, so almost no resistance)
And you might blow up your speaker because of dc voltage...
If you make a picture of the solder points, I might be able to tell you if you should do it or not...
If the solder points are parallel to the other speakers solder points then you can probably add a speaker, but you might overload the audio amplifier. This overloading is not that bad and the audio amplifier probably has an build-in overload protection by turning itself off.
If you want to test the parallel connections:
- turn tablet off
- check with multimeter for short circuit or low resistance (nearly 0 Ohm)

you can look for yourself on the motherboard picture above.
check the lower left corner.

thanks for the heads up.

tasselhof

This post has been edited by MrTasselhof: 21 March 2012 - 07:20 PM

[purundahl1]

I don't like autopsy.
But I'm happy to see this one.
A lot of useful information out of a lot of effort.
Nice work~!

[Christian Troy]

it looks pretty similar to my Mediacom Smartpad 907c which is a rebrand of MOMO11 Bird
another "clone" is jxd s9000.

could you post the results of "lsmod" and "getevent -p"?

[MrTasselhof]

Christian Troy, on 22 March 2012 - 08:40 AM, said:

it looks pretty similar to my Mediacom Smartpad 907c which is a rebrand of MOMO11 Bird
another "clone" is jxd s9000.

could you post the results of "lsmod" and "getevent -p"?

are those ADB commands?
or ADB Shell commands?
or?

Tasselhof

[LVL]

MrTasselhof, on 21 March 2012 - 07:19 PM, said:

you can look for yourself on the motherboard picture above.
check the lower left corner.

thanks for the heads up.

tasselhof

Ah well,I can't argue with the spk+ and spk- text on the motherboard.
So, give it a try!
Before you try it, check the how much Ohm the speakers are and solder a speaker with the same Ohm. This way, you can't go wrong

[Christian Troy]

adb shell (lsmod shows loaded kernel modules, and the other one gives information about connected input devices)

but I've seen in firmware sub-forum you're already using momo11 bird firmware so they're not needed

today I've ported ainol's "novo 7 clean rom" which is based on baseband 1.0 to our device and seem smoother, even ICS stock browser which is laggy on momo's rom... I'm waiting for author's approval then if you're interested i can post it

[MrTasselhof]

Christian Troy, on 22 March 2012 - 09:05 AM, said:

adb shell (lsmod shows loaded kernel modules, and the other one gives information about connected input devices)

but I've seen in firmware sub-forum you're already using momo11 bird firmware so they're not needed

today I've ported ainol's "novo 7 clean rom" which is based on baseband 1.0 to our device and seem smoother, even ICS stock browser which is laggy on momo's rom... I'm waiting for author's approval then if you're interested i can post it

Wouldn't hurt to try.

Tasselhof

[BlueEyes]

wow nice, another firmware :-) seeing as ainols support would probably be better than gemeis, i am all for it

what are the differences from our tablat to the ainol one? i thought they were kinda the same.

[Sean_Vancouver]

it's nice to see inside the tablet. I have one being shipped from Hong Kong and expect it this weekend or Monday. I am truly excited.

[Christian Troy]

Allwinner base are all similar, you need to change some things like kernel, modules, some system libraries and configuration files to make it work.
I've posted it here if you need it in the previous page you'll find a cwm recovery i had compiled with some things changed for our tablet (like kernel, key layout and .android_secure location)

[fraxos]

MrTasselhof, on 20 March 2012 - 04:26 PM, said:

It's what I do ;P

Although some devices get and deserve more attention
It becomes easier to read when a tablet is going to be popular and has great potential, so you try a little harder.

It is funny though... it use to be that finding a tablet that can play my 1080P videos was a challange/good sign... now that is nearly a given/minimum.
I will have to figure out what the next "High Class" tier/problem to surmount.
Screen quality has also dramatically improved with IPS and again will soon be become the minimum/standard.

I think that could easily be Facebook games, but the only issue is that I don't think that hardware is solely or even the major issue.

One big thing that these tablet makers need to grasp and commit to is added Bluetooth by default.

Tasselhof

It is indeed disappointing to see that there is no built-in Bluetooth but would an external adapter work?

[MrTasselhof]

fraxos, on 23 March 2012 - 06:16 AM, said:

It is indeed disappointing to see that there is no built-in Bluetooth but would an external adapter work?

So far.. i am not aware of a solution that works with any AllWinner device and bluetooth.
If you find a solution for one device though (Aurora, Elf, Advanced, Gemei, Momo etc..), then we can most likely make it work with Gemei.

Tasselhof