08-22-2019, 10:41 AM
(05-07-2019, 02:32 PM)azzaboy18 Wrote: Hi I have a JY-VO131N4G and my 4G was completely unusable. It would say 1 or 2 bars but it was too bad to even run a speed test. It did not matter what antenna I used, nothing changed.
I opened up the head unit to investigate and found that they decided to try and save a portion of a cent by directly soldering the antenna jack's fly lead onto the mainboard instead of using the little push in connectors (like the internal ones used on a laptop wifi card).
On the board, there is a trace that goes to a push in antenna jack then next to that is a big solder pad. It does appear however that the pad they soldered to is not connected to anything. meaning the antenna jack you are connecting the 4g antenna to is not actually connected to the 4G chipset.
it looks sort of like this:
-----------------------------------------------------O------------------------------------------[]
(Trace leading from 4G modem) (push in antenna jack) (Solder point antenna is actually connected to)
the left and right side of the O in the diagram are not electrically connected, however, it appears that the design used assumes that it is
google "smd connector wifi" to get an idea of the connector I'm talking about.
anyway, I was able to get mine to work well buy soldering a small jumper wire from the left side of the push in connector to the right side, making the pad they soldered to electrically connected to the modem.
mind you, I did this with a microscope and a micro soldering pencil.
you could probably just order a new fly lead with the push in connector and attach to the connector next to the pad they soldered to.
hello, can you put some pics of your tweak ? for example before and after ? to understand the problem and your solution ? it's good for the joying communauty . i see that many people have the same problem.