Author Topic: Anyone tried replacing the internal SD card on the JXD 7800? (Read 14867 times)

buttmachine · « **Reply #20 on:** January 31, 2014, 01:54:57 pm »

im sorry that link sends me to a purchasing site that is in a different language than i speak

also off topic im a hardware guy and have been trying to work out issues mainly temps and mods, and i think ive done very well my jxd no longer gets sluggish due to temps and i can charge via usb 2.0 very quickly, though im not ballsy enough to try 3.0 for its 10 amps of power

buttmachine · « **Reply #21 on:** January 31, 2014, 01:57:47 pm »

i did check that spot in mine...mine must be a different right side pcb because it just has holes my joystick uses for alignment...though i think your board either has cold soldering points like you said...or test points (whice i see a lot in mine but not there)

buttmachine · « **Reply #22 on:** January 31, 2014, 02:01:02 pm »

i just finished my benchmark on antutu and my jxd no longer gets hot...even sitting on a bed or pillow, so quicksilver did wonders in it

im thinking for taxes i may buy the 16gb russian version make the mods i did in mine then see if i can get tan and skeltons supercharged rom to work in it, i think combined with my temp and charging mods a new machine would prove to be unparalelled, and may handle the 1900mghz OC

stpat · « **Reply #23 on:** January 31, 2014, 05:10:35 pm »

Quote from: buttmachine on January 31, 2014, 02:01:02 pm

i just finished my benchmark on antutu and my jxd no longer gets hot...even sitting on a bed or pillow, so quicksilver did wonders in it

What's quicksilver? Link?

buttmachine · « **Reply #24 on:** January 31, 2014, 05:48:17 pm »

quick silver is one of the top grade computer thermal pastes, i found the rockchip doesnt even fully contact the heatsink, the same as a few other chips on the same side, so i dabbed it on all the IC's that are under the thermal blanket and i dropped many degrees and the back wont raise over 100F even on a bed or blanket doing benchmarks

stpat · « **Reply #25 on:** January 31, 2014, 05:59:52 pm »

Quote from: buttmachine on January 31, 2014, 05:48:17 pm

quick silver is one of the top grade computer thermal pastes, i found the rockchip doesnt even fully contact the heatsink, the same as a few other chips on the same side, so i dabbed it on all the IC's that are under the thermal blanket and i dropped many degrees and the back wont raise over 100F even on a bed or blanket doing benchmarks

Excellent, thanks. I'll have to give it a try.

buttmachine · « **Reply #26 on:** January 31, 2014, 06:03:12 pm »

its worth doing if youre already planning on going into your tablet anyhow....also if you plan to supercharge it

also i hardwired my usb, im officially the first 7800b user that i know of to charge from the onboard micro usb jack with success

igboo · « **Reply #27 on:** January 31, 2014, 11:16:02 pm »

@buttmachine: You wouldn't have any pictures of the mSD connector on the pcb, would you? Would you say the solder leads on the card connector are 1mm or .5mm?

buttmachine · « **Reply #28 on:** January 31, 2014, 11:59:11 pm »

They are between 0.025-0.5 on the USB jack its the far pin closest to battery that is VCC+ 5v on the charge jack side its much bigger and the surface point is 1.0 mm or wider, I suggest you add extra solder to this point because I've seen 3 users have the pin get pushed in

As for photos I have a Sony bloggie HD and dingoonity site won't let me click post when I add photos to attachment

Kingzak34 · « **Reply #29 on:** February 01, 2014, 12:13:32 am »

Quote from: buttmachine on January 31, 2014, 11:59:11 pm

They are between 0.025-0.5 on the USB jack its the far pin closest to battery that is VCC+ 5v on the charge jack side its much bigger and the surface point is 1.0 mm or wider, I suggest you add extra solder to this point because I've seen 3 users have the pin get pushed in

As for photos I have a Sony bloggie HD and dingoonity site won't let me click post when I add photos to attachment

Host your pics in any hosting site, as I told you

buttmachine · « **Reply #30 on:** February 01, 2014, 12:17:53 am »

That link sent me to a site that wouldn't translate to English, it gave me an error however I could email it to someone, though I should be able to post them here like everyone else. I've never had issues with posting photos on a site, hell I could post my Facebook link and host them there if that works

Joe Sixpack · « **Reply #31 on:** February 01, 2014, 02:33:07 am »

Quote from: buttmachine on January 31, 2014, 01:43:42 pm

My apologies man i swore to god it was this one but i guess lack of sleep made me assume it was the 7800

unfortunately i was a dumbass and forgot where i saw the motor mounting point it was on a different machine.

however i did solve the usb hardwire issue for charging.

also if i were to buy another 7800B where could i find it with the other 8gb on board or would it be easy to add the chip myself?

also this forum doesnt support high res photos so i cant post anything

Ah, that sucks got me all hopeful there for a minute.

You can use tinypic.com.. that's what I use don't even need an account to upload if you don't want.

Quote from: buttmachine on January 31, 2014, 05:48:17 pm

quick silver is one of the top grade computer thermal pastes, i found the rockchip doesnt even fully contact the heatsink, the same as a few other chips on the same side, so i dabbed it on all the IC's that are under the thermal blanket and i dropped many degrees and the back wont raise over 100F even on a bed or blanket doing benchmarks

How did you take the reading? does the SoC have a temperature sensor? if so what app did you use to access?
Did you happen to take any snap shots of that area, im curious what sort of heatsink it uses.

buttmachine · « **Reply #32 on:** February 01, 2014, 02:48:03 am »

I used a crude way of having a digital thermometer probed into the back panel, in fairly sure its a few degrees off it read around 88-92 degrees when stuck to hot spots and of course the back almost never feels warm now

buttmachine · « **Reply #33 on:** February 01, 2014, 02:53:10 am »

The heat sink is the metal plate that you find on the back of any IPS screen so it spans the whole device short of the buttons, also I'll pin a bookmark for the photo site on my PC, its still faster at this stuff than this 7800 but its catching up fast, I just need a ROM change I think

So tonight I'll just take photos of everything inside and out maybe clean up my jumper for the USB

And sorry again abt the motor thing I won't be up late working on stuff anymore

buttmachine · « **Reply #34 on:** February 01, 2014, 04:19:08 am »

ok as of right now im going through everything inside the 7800b i have noticed even with thermal paste the heatsink (screen back plate) doesnt even touch the chips....none of them taking photos and tonight ill post on the tinypic site

let me know what all you guys need pics of ill get as many as i can

buttmachine · « **Reply #35 on:** February 01, 2014, 05:20:29 am »

im uploading to tinypic now, i must say i have established technically these chips arent using the plate that is obviousely intended as a heat sink...but in my photos youll see how i solved it

youll see as well my fix for the charge pin...please excuse the burn on the box....i had a shakey hand during my first trial

buttmachine · « **Reply #36 on:** February 01, 2014, 06:08:15 am »

i have finished uploading my photos @ tinypic.com the keyword is jxd s7800 mod

message me for any questions

Joe Sixpack · « **Reply #37 on:** February 01, 2014, 06:34:34 am »

Any pics related to the cooling

From the sound of it maybe a copper shim would help fill the gap
Search brought up nothing for me..
You can post pictures here from tinypic

Kingzak34 · « **Reply #38 on:** February 01, 2014, 07:16:24 am »

Quote from: buttmachine on February 01, 2014, 06:08:15 am

i have finished uploading my photos @ tinypic.com the keyword is jxd s7800 mod

message me for any questions

Cant find it. Why don't you post a link ?

buttmachine · « **Reply #39 on:** February 01, 2014, 07:26:29 am »

ok from what i understand tinypic holds photos for human review to avoid illegal like porn or copyrightten photos just to be safe so we have to wait til they post them.....keyword will be jxd s7800 mod for all my photos when they decide to post them