I bought 3 of these for me & for friends. 2 worked perfectly, but one had very bad wifi connection problems. More than 8 feet away from the router, or not in line of sight to it, and there was no signal. After looking at youtube videos of general wifi issues with Chinese tablets I thought the problem was the wifi antenna connection to the motherboard. On opening the tablet an engineer noted a large blob of solder on the central wire of the coax cable which had melted the insulation across to the shield cable-thus shorting the antenna. Just like you can get a good tv picture with a coathanger as an aerial if you are in a strong signal area-here you are getting the same good wifi signal with a shorted aerial, but no range. If you have a bad wifi signal problem-return the tablet to China for repair, or try a local electronics repairer (youtube video of how to disassemble available)-you will of course invalidate the warranty but it will be cheaper than sending it back. Postage alone would be £30. The lack of a proper warranty is a risk you take when buying direct from China-it's why they are so cheap. Otherwise the tablet is brilliant, even with the standard v1.05 firmware.

Please try to attach some photos if you find something is wrong with soldering

 Hi!   I have fixed my WiFi signal issues by replacing the internal antenna with a new one. I think the original antenna is not good enough (maybe its geometry is bad, see my pictures below). The second (and most important) issue is the metal strip around the case. It totally blocks WiFi signal horizontally. I have tested the WiFi reception without this metal strip and the signal was good. If I put it back, I've lost the signal immediately. So if you want the best WiFi signal, remove that metal strip. The antenna is next to the speaker on the right side of the tablet. Another thing (the third issue). I have removed a metal piece too to improve signal quality, it was next to the WiFi antenna inside the tablet. I have created a few pictures, you can watch them here in high resolution.

Where did you buy the antenna ?

Did you connect the new antenna at the MB, or just remove the original antenna and reuse the same wires ?

Can you show photos of where you made the connection, the MB or the back of the new antenna ?

How did you remove the metal strip inside the tablet ?

Here is a video showing how to disassemble the U30GT, I am sure the U30GT2 is the same, it shows removing the metal strip. 

Thanks

Chris

Hi!

First of all, sorry for my poor english

[I have uploaded more pictures to here!]

The pictures in order:

1. The tablet's case. I have marked the antenna's position with red. As you can see, the metal strip is strongly blocking the signal. Of course its nice, but please... Where were the engineers at the design plan?
2. Case opened, overview. Be careful when removing the back of the tablet, because you can easily break the camera. The camera module is glued into the cover, but it can be removed with a knife or a small screwdriver. Its cables can be damaged easily too.
3. Camera electronics and its chipset. Here is the antenna cable connection to the motherboard. It requires soldering if you want to replace the cable. It could worth a shot, but I kept the original cable, it was good enough.
4. The original antenna in its original position. There is a metal piece on its right (what I have removed later). The antenna's geometry is not so good I think. It is just a piece of metal what wants to be an antenna, but its not a good choice.
5. One of the two battery packages. Nice parameters. So there are two 7.4V 3600mAh battery packs. I think these in parallel, so we have 7.4V, 7200mAh. Its not 10000mAh what marketing said, but still enough And its clearly true you cannot charge these packs from a USB port. The USB2.0 specification says a port can give 5V, 500mA. Its just not enough for the tablet, because the charging time would be almost a day (23.5 hours if I calculated right and the efficiency is around 90%).
6. Removing original antenna in progress. I've just cutted the tape what held the antenna. This tape is glued onto the battery so it was easy to remove it. Just pull out the antenna, there are no screws.
7. Original antenna from other view.
8. New antenna in the tablet above the metal strip in vertical. Its geometry is more detialed compared to the original antenna. If you want the best WiFi signal, do not put back the metal strip (aluminium strip?) around the case. The metal strip on the right of the antenna is missing now, because I removed it to improve the signal quality.
9. New antenna from top. I have used the original cable and just soldered the antenna to it.

I've ordered the new antenna from eBay, you can find it easily by searching internal laptop antennas. Good to have a flexible like this one, because I could put it into the tablet easily.

[Here is the video what shows how to open the case]

fana75 said
Dear geloczigeri

Thank you for your explanation....

What Torx did you use: T2 or T3?

Doing this mod improve the Wifi for sure?

No more signal loses or poor speed?

Regards

 

Hi!

I had no wifi signal in my kitchen. After I have replaced the antenna, I could browse the internet in the kitchen and there were no signal loses.

If I removed the aluminium strip from the case, the signal quality was really good.

I have used T3 Torx.

Regards