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Other Portable Consoles => JXD Devices => Topic started by: efisal on January 23, 2014, 08:40:15 am

Title: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 08:40:15 am
JXD S7800B WiFi Problem any solution ?

I just got JXD S7800B and i love it. the only problem that i have is very poor WiFi signal, even from 3 feet from the router.

is this a known problem with this device? any solution?

i saw online video about customizing the analog stick and the guy talk about the poor WiFi, he claimed that the antenna wire is seating wrong next to the battery and he manage to fix it by moving it or somthing ( not clear what he saying exactly).

http://www.youtube.com/watch?v=EZej-hEWtEk

Will be happy to hear a solution.


Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: abhoriel on January 23, 2014, 11:08:31 am
yeah I had the same problem with my JXD S5110B. The WiFi antenna was stuck onto the battery, which I guess was effectively earthing it. It was an easy fix: open up the device and stick the antenna somewhere else. My WiFi was great after that

The same should be doable with the JXD S7800 although I haven't needed to open it up, from what I hear its slightly more difficult because of the ribbon cable, but it should definitely be doable.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: Vimtoman on January 23, 2014, 05:59:46 pm
Probably your router. Is it Wireles N. If not then that could be your problem.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 07:02:13 pm
I have Motorola cable modem sbg6580, it is a Wireles N.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 07:07:06 pm
yeah I had the same problem with my JXD S5110B. The WiFi antenna was stuck onto the battery, which I guess was effectively earthing it. It was an easy fix: open up the device and stick the antenna somewhere else. My WiFi was great after that

The same should be doable with the JXD S7800 although I haven't needed to open it up, from what I hear its slightly more difficult because of the ribbon cable, but it should definitely be doable.


What is the trick to open it? i tried 4 times but the inside clips are not popping out (on the top and bottom, side are easy to open and stay open), i don't want to use to much force to brake the plastic.

will appreciate the help  :)
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 07:10:30 pm
yeah I had the same problem with my JXD S5110B. The WiFi antenna was stuck onto the battery, which I guess was effectively earthing it. It was an easy fix: open up the device and stick the antenna somewhere else. My WiFi was great after that

The same should be doable with the JXD S7800 although I haven't needed to open it up, from what I hear its slightly more difficult because of the ribbon cable, but it should definitely be doable.


What is the trick to open it? i tried 4 times but the inside clips are not popping out (on the top and bottom, side are easy to open and stay open), i don't want to use to much force to brake the plastic.

will appreciate the help  :)


found the solution,


http://dingoo-scene.blogspot.com/2013/11/jxd-s7800b-teardown-disassembly-pictures.html
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 07:51:40 pm
is my antenna wire broken?



(http://i.share.pho.to/f2f3bc5d_c.jpeg) (http://pho.to/4cHTH)


click on the photo for full size
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 08:34:10 pm
is my antenna wire broken?



(http://i.share.pho.to/f2f3bc5d_c.jpeg) (http://pho.to/4cHTH)


click on the photo for full size



Yes it was!!! i fixed it and i have full Wifi reception.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: Bargaintuan on January 23, 2014, 08:44:28 pm
Nice! I wonder if anyone else's problems with reception are due to broken antennae. My reception has been similar to my BlackBerry Playbook's, which works for me.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 09:08:11 pm
Nice! I wonder if anyone else's problems with reception are due to broken antennae. My reception has been similar to my BlackBerry Playbook's, which works for me.


it looked like it was poor unfinished antenna assembly in the manufacture place ...... well, until Google will have Nexus Game pad.... we will need to deal with this type of build quality.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: Timber on January 23, 2014, 10:47:37 pm
That's hilarious, it was completely off!
Did you solder it?
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 23, 2014, 11:28:09 pm
Yes  8)
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: Timber on January 23, 2014, 11:47:42 pm
Glad you got it fixed the right way, most would have freaked out and sent it back. :)
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: bopz44 on January 23, 2014, 11:51:05 pm
hey guys it seems i've got the same problem as my wifi is so slow is my wifi antenna well connected?

(http://img15.hostingpics.net/pics/448866IMG20140124003524.jpg)
(http://img15.hostingpics.net/pics/661922IMG20140124003615.jpg)
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: efisal on January 24, 2014, 12:07:53 am
hey guys it seems i've got the same problem as my wifi is so slow is my wifi antenna well connected?

My device had a sticky isolation protector on top of the antenna ( the side that under the battery). AND on the power wires!

1. maybe it having isolation issue when the battery is seating on top and preventing the WiFi signal to be received.

2. or the soldering is bad.

i will recommend to try first to isolate it first.

Good luck and let us know what happen
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: bopz44 on January 24, 2014, 12:16:51 am
ok i moved the lil sticker OUT OF THE CONSOLE lol :

(http://img15.hostingpics.net/pics/873183IMG20140124011408.jpg)

but speed are still slow, what is really strange is that i do around 1mb connection on download BUT 5-6mb on upload...

So you think it's bad soldery?
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: Kev7112001 on January 24, 2014, 12:17:56 am
hey guys it seems i've got the same problem as my wifi is so slow is my wifi antenna well connected?

(http://img15.hostingpics.net/pics/448866IMG20140124003524.jpg)
(http://img15.hostingpics.net/pics/661922IMG20140124003615.jpg)

yeah thats not a good soldering job at all looks like its being grounded out
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: Timber on January 24, 2014, 12:52:00 am
Yeah looks like a pretty crappy solder job, may need reworking :D
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: kazy on February 09, 2015, 01:06:29 pm
Hello,

Have you try to reworking the solder of the antenna ?
I'm searching a fix for this wireless problem.
Too much packet lost for remote gaming or streaming :/
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: 153stars on February 09, 2015, 02:01:47 pm
Search wifi antenna I posted some replacement ones a few posts back by another trusted member. It uses 801 BGN type so if you get a pair you wont use the 5ghz one at all. Haven't done mod yet. There are many internal wifi antenna mods on utube. You can check the wires for good solder and there should be no multi meter continuity between antenna and its shield.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: kazy on February 10, 2015, 12:33:22 pm
Thx 153stars.
I will take a look

I have a dual band router at home so i'm interesting to put a dual band antenna if it's possible
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: 153stars on February 10, 2015, 02:54:55 pm
I dont believe the 7800 supports 5ghz thats why there is only one antenna. That doesn't mean you wont see benefit from router if using multiple devices at a time. As 2.4 gets crowded other capable device will to use 5ghz . The slightly higher dba antenna will help but at cost in directionality . Of course a better made quality might do better full cross the board. Read about how to install them as well i think the benefit from  the ground area on meta larea or battery not "necessarily grounded on it " and antenna area sticking out from it.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: kazy on February 10, 2015, 03:52:46 pm
I dont believe the 7800 supports 5ghz thats why there is only one antenna. That doesn't mean you wont see benefit from router if using multiple devices at a time.

You're right
www.wpgcloud.com/commonDataSheet.action?name=00001383-xRTL8188ETV(QFN46)-CG_DataSheet_0_1_20120803.pdf

Chip is only 2.4Ghz compatible.

The slightly higher dba antenna will help but at cost in directionality . Of course a better made quality might do better full cross the board. Read about how to install them as well i think the benefit from  the ground area on meta larea or battery not "necessarily grounded on it " and antenna area sticking out from it.

Thanks for advises !!
I already have upgrade some wifi devices with external antenna and higher DBA. But Wifi connectors was small clips to connect not soldering connector. I need to practice because :  I'm a solder of fortune  :-X
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: 153stars on February 10, 2015, 06:27:33 pm
A small pen type iron, I like 70tin-30pb rosin 60-40 ok too, tin wires first ,keep tip clean and tinned. Old solder sometimes the rosin receded back into hollow of solder ,so waste a little. On circuit boards faster is better if you linger too long coatings contaminate the job. Get a bump on pads"contact points" of solder, tin wires first lay on bump. melt together. An extra set of hands never hurts in this case probably not necessary. A good job looks shiny as it cools without wire moving in the process.
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: kazy on February 13, 2015, 04:06:18 pm
Ok i have maybe another solution.

I have purchase a DWA-125 usb wireless key.
Same wireless chipset ( RTL8188ETV) than the S7800, so drivers are include in
No need to recompiling kernel , no ?

I have test to connect le dongle with OTG. Device seem to be correctly detected.
OTG host controller show me the : DW4-125 802.11n adapter.

Now i must find how to use this usb wireless key instead of inboard wireless chipset.
I have found this :
http://forum.xda-developers.com/showthread.php?t=1484339
but i don't know if i can chroot my device with linuxonandroid ?

I have also try this :
https://forums.kali.org/showthread.php?18269-wifi-connection-on-external-adapter-%28nexus-7-android%29

But i have a segfault error when i'm trying to start the wlan1

I'm running the kitkat 4.4.4 custom rom (@luiji)
Title: Re: JXD S7800B WiFi Problem any solution ?
Post by: kazy on February 19, 2015, 10:46:11 am
I haven't found yet a workaround to use the wirelless usb key with OTG.

So i have test to rework antenna's solder and move the antenna in another place.
Signal is more stable but still have too much high and low signal transfert ... until I'm moving the device in a particular position from my routeur => OMG  !! perfect signal

3-5 ms ping, no more paquets lost
I was able to remote streaming my computer's games on my S7800 flawless.

I don't have this kind of problem with my wifi laptop at the same place.
The JXD antenna isn't suppose to be multi directionnal ?

I will try to change the antenna for a better one, maybe an external antenna is a good idea.