[G Tablet General] mystkrh:
I wanted to break this off since the other topic was looking to be mostly about the LCD's

I'm an electronics tech (avionics really) just so you know my background, and I am by no way a programmer i just hack my way throught when i need... poorly at that. I'm a long time reader but don't post much.

I havent taken mine apart yet, I bought it for the wife to use as an ereader she was using her evo before and already has bad eyesight I just dont think reading on that small screen is good for her. However we planned on returning it today because she couldn't get anything to work... But i loaded VAGAn-Tab rom on it and she likes it ALOT more now, but we still might be returning it (she thinks it to big and heavy to hold). So all I have to work with is the internal pics posted by other members and I thank you for them!

I was thinking about using a mini pci card with 3g/4g and GPS to solve my problem like this one for Sprint Customers looks very nice and they claim android support. Could someone please verify the length available for the card from the socket to the mounting holes? It should be around 50mm but i cant tell from the pic.

I cant post a link so google

franklinwireless

M600_datasheet_v1.pdf

Then after more research I figured out that think I can get the GPS to work on the board. I found that the RXM-GPS-SG-T looks to be the exact chip they are using, the pin look to match exactly VCC, GND, RX, TX, RF, VOUT. So they are using an active GPS antenna (but could be modded for passive). They use NMEA-0183 or SiRF Binary output selected by a serial command. So we need to figure out if the TX is going to U39 making U39 the interface to the unit, or directly to somewhere else (idk need to see board) I hope i can attach my pic i made or maybe an admin can post it for me.

However the PCI slot might be just as hard to use, the pin 20 that has 3.3v isnt what we want, but it could be a software control to disable/enable the card. However we still need A+ on pins 2,52 (3.3V), 6,28,48(1.5V) and maybe 24(3.3V Aux) dependeding on the card. We could be dealing with a "Non Standard" connector, they are out there but most OEM's dont bother with them. More likely to find them on a Asus product ect. It's common for the SIM card to be powered by the PCI card itself and the board looks wired that way. I have 2 Digi International Mini PCI express Wifi/Cell Development boards and thats how they both power the SIM card. Pin 16 should goto Pin 1 on the sim card, 14->2, 12->3, 10->6 but maybe 7 or 8.

Getting the Power to it could be software or hardware. Looks like around U8 on the frontside could a Vreg setup, Or it could be as simple as putting in some 0 ohm resistors around R15 and R14. We also see that U7 is unpopulated on backside. So that leave us with U7,U8, R15, and R16 which could mean they are all part of the same circuit if they laid it out with any logic. TP1,2,and 3 also make me believe this is true, however they match up to LED_WPAN#, LED, WLAN#,and LED_WWAN#. I sure wish they match the power input pins, but that means all those missing resistors could just be for unpopulated status LED's. Like I've said over and over i cant tell ya unless i can probe around the board.

As far as the memory, yes its possible, I do BGA replacement at work. What I am afraid of is that the other memory chips look to be exactly on the other side and I'd be afraid of messing them up. I'd have to look at my jig at work and see if I could set it up without any problems.