Im doing some smuggling business in my country, Android tablets are very popular, and I get good price difference when buying in China and selling in my country.
First time - I bought FT2 (Superpad, Infotmicx220) and 2 units were faulty.
second time - I bought FR-809's and one unit was broken.
so, I was trying to fix it on my own, and opened the unit (no screws version, dual speaker) and it was bad soldering. the battery/SoC connection was off, so I fixed it.
now the tablet works, but I already sold all other units, so I want to experiment.
One of my broken Superpads is with internal GPS receiver, no need for GPS Antenna. so, Idea struck me - could it be possible to solder GPS unit onto the Freescale SoC .. ?
Android would handle the reception, it's all there, I just need to figure out if it's possible, and if there is even an option to solder GPS receiver onto SoC ?
that internal receiver from Superpad is awesome, and it would be awesome if I could have GPS on my FR-809 tablet.
could someone please tell me is there a "free slot" for soldering stuff. like a PCI bus on motherboards ? and, would system be able to recognize the newly soldered GPS receiver ?
anyone ?
Im also thinking about soldering SIM slot onto it, at least for 3G cause i believe it needs a whole lots of other stuff for GSM function to be enabled (voice radio, n such)
i got this px5 KGL (erisin) for my sisters mercades b200
man this is terrible.. now i understand what people were complaining about..
when BT is connected to phone the wifi is useless!!
my KSP unit does not have this..
i have already soldered an external wifi antenna, but it does not help at all!!
how r people coping with that?
i am already on latest MCU 2.54..
I hear you buddy, I have a KGL as well upgraded from px3 to px5 board, and also soldered a proper wifi antenna.
In my experience, if wifi is connected (tethering phone data for example) I am unable to pair the phone using Bluetooth.
I normally turn off the wifi on the head unit pair the BT and then turn on the wifi again.
The drawback is that whenever bluetooth is paired, wifi does not transfer faster than about 3 Mbps.
The moment I turn wifi off, the wifi speed improves absurdly
I am evaluating the possibility of replacing the wifi + bt chip...
GeorgeM269 said:
I hear you buddy, I have a KGL as well upgraded from px3 to px5 board, and also soldered a proper wifi antenna.
In my experience, if wifi is connected (tethering phone data for example) I am unable to pair the phone using Bluetooth.
I normally turn off the wifi on the head unit pair the BT and then turn on the wifi again.
The drawback is that whenever bluetooth is paired, wifi does not transfer faster than about 3 Mbps.
The moment I turn wifi off, the wifi speed improves absurdly
I am evaluating the possibility of replacing the wifi + bt chip...
Click to expand...
Click to collapse
It is one chip for both.. it is surface mounted.. good luck changing that..
May be an external Wi-Fi dongle of some soft. I do believe back in mtcb units they had succeeded going that road
i looked into this. the surface mounted chip is an usb interface connected device.
http://www.realtek.com/products/productsView.aspx?Langid=1&PFid=59&Level=5&Conn=4&ProdID=373
if it is a usb device one could try to desolder it and put an usb port there instead. and then connect a usb dongle with the same chip externally...
https://www.alibaba.com/product-detail/COMFAST-CF-WU725B-2016-Newest-Bluetooth_60474792223.html?spm=a2700.7724838.2017115.31.2f898c12d58o8j
but honestly i doubt it will fix this.
btw. do you have this buzzing/humming sound in the spekers when using bluetooth handsfree? with the actual malaysk rom i cannot do one call i can hear nothing and peaopletelling me it sounds like a helicopter.
with HA rom it works 90%.
i haven't hooked up this unit to the car yet
zapedge said:
i looked into this. the surface mounted chip is an usb interface connected device.
http://www.realtek.com/products/productsView.aspx?Langid=1&PFid=59&Level=5&Conn=4&ProdID=373
if it is a usb device one could try to desolder it and put an usb port there instead. and then connect a usb dongle with the same chip externally...
https://www.alibaba.com/product-detail/COMFAST-CF-WU725B-2016-Newest-Bluetooth_60474792223.html?spm=a2700.7724838.2017115.31.2f898c12d58o8j
but honestly i doubt it will fix this.
Click to expand...
Click to collapse
I have been brainstorming for a few days when I have had a chance to check how this chip could be replaced. While yes, it is surface mounted, it has its own circuit board which is then soldered to the main board. The module looks like this:
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and this is the pinout:
I have thought about ways of upgrading to a RTL8821CU instead, since the radio only takes 2.4 GHz wifi signals anyways.
http://www.realtek.com/products/productsView.aspx?Langid=1&PNid=21&PFid=60&Level=5&Conn=4&ProdID=386
Packages are similar (QFN 56 pins) so there should be modules built from these as well.
datasheet: http://en.ofeixin.com/downloadsfront.do?method=picker&flag=all&id=d0dc83f6-b71f-49ae-8469-2c8761f94551&fileId=64&isDownloadPermissions=true&memstate=/members_login.html
zapedge said:
btw. do you have this buzzing/humming sound in the spekers when using bluetooth handsfree? with the actual malaysk rom i cannot do one call i can hear nothing and peaopletelling me it sounds like a helicopter.
with HA rom it works 90%.
Click to expand...
Click to collapse
I do hear the noise as well, running Malaysk too, it has not been as rough in my experience, mostly only noticeable when the car is stationary. I did have to change the mic because it sounded like I was in a construction zone, lots of random noises during calls.
today i removed the antenna from my device entirely.
absolutely no difference. ist seems the antenna is not connected to the wifi chip which would perfectly explain why we have this bad wifi reception....
did a check on spareparts on aliexpress. found the following
https://www.aliexpress.com/item/RTL8723BU-USB-Interface-WIFI-BT-Wireless-internet-MID-GPS-Bluetooth-WIFI-wireless-module/32466684026.html
there are some specs listed in the most detailed form i could find yet.
bullet 5 describes how an antenna for the chip should be built.
https://ae01.alicdn.com/kf/HTB1eGojJpXXXXXKXpXXq6xXFXXXc/116872914/HTB1eGojJpXXXXXKXpXXq6xXFXXXc.jpg?size=143645&height=751&width=512&hash=992dd655945fb5ee7d91c23ad7a3a04a
could the missing condensers be the issue?
im not that into high fequency electronics. but i think i remember condenser in line is a hipass-filter...
maybe there are some low frequencys interfering with the chip?
i removed the BT cable antenna completely and it made no difference.. i thought that might reduce the impact, but interference is the same. useless.. i am returning the stupid KGL thing.. absolutely crap
I have the same problem and decided to apply a simple solution.
The issue is produced for interference between wifi and bluetooth signals. They are in near frequencies and hardware doesn't have enougth protection.
So, I decided to turn wifi off anytime I must use bt for a phone call. All interferences completely dissapear and phone conversation is clear both sides of the line.
Hi, i found a solution for the problem. I bought a USB wifi+BT dongle and i connected to the rear usb port of the unit. By restarting the system the bluetooth and wifi starting work again.
danielsat said:
Hi, i found a solution for the problem. I bought a USB wifi+BT dongle and i connected to the rear usb port of the unit. By restarting the system the bluetooth and wifi starting work again.
Click to expand...
Click to collapse
Can you give us a link of the dongle?
I thought external dongles don't work on threes machine..
Nomader0 said:
Can you give us a link of the dongle?
I thought external dongles don't work on threes machine..
Click to expand...
Click to collapse
Comfast wu725b is said to work with these units and will override the built in module. Just search for it on Ali or eBay. Or search for wifi bt dongle and look for it. My phone wont let me copy the link at the moment for some reason
Skickat från min ONEPLUS A3003 via Tapatalk
WarSpaz said:
Comfast wu725b is said to work with these units and will override the built in module. Just search for it on Ali or eBay. Or search for wifi bt dongle and look for it. My phone wont let me copy the link at the moment for some reason
Skickat från min ONEPLUS A3003 via Tapatalk
Click to expand...
Click to collapse
does that overide thw wifi module or both wifi and BT?
Nomader0 said:
does that overide thw wifi module or both wifi and BT?
Click to expand...
Click to collapse
As i have understood it, it will override the bt automatically and still let you use the built in wifi if you want, but you can also use the dongles wifi module if wanted
Skickat från min ONEPLUS A3003 via Tapatalk
I've had similar problems with a KGL MTCD/MTCE unit (2GB RAM, PX5, with MTCD MCU). The problem isn't the ROM, but for reference, I'm running Malaysk's latest PX5 ROM. Most notably, I experience significant break-up using bluetooth for calls. Additionally, I'm unable to pick up WiFi from inside my house out in my driveway, though various phones and laptops can do this acceptably well.
We opened the unit, found bad soldering at the WiFi/Bluetooth module, and attempted to repair it. We replaced the antenna with an SMA pigtail and longer antenna, and removed a soldered short in the board. We then powered back up with the new antenna, and found the signal no better, and in fact possibly worse than before (we may have damaged something when trying to fix the module).
We also noted that there is a small antenna printed on the bottom side of the board. There were several problems with this. First, the "internal" antenna was "connected" (more on that in a second) to RF1. RF1 on the specs for this module as published by a number of sellers on AliExpress shows RF1 as being no contact. So, we're not even sure how that's supposed to work. Second, I said "connected" before, because the soldering was bad and apparently didn't really have a connection at all. Third, being an antenna on the underside of the board inside a metal case will probably preclude it from working at all anyway.
The biggest problem is likely metal under the dash of my car, which prevents WiFi from being picked up well under there. The antenna needs to be moved out from under the dash.
I considered getting an SMA extension cable to simply move the antenna. However, at the end of the day, I've ordered a USB module, in the hopes of getting it to work. The module is listed as "USB WiFi Bluetooth Adapter, Wireless WiFi Dongle Network Adapter 150Mbps & Bluetooth Transmitter Receiver with External Antenna for Desktop/Laptop/PC, Supports Windows 7/8/8.1/10/XP/Vista/Android" and sold by "iFun4U" on Amazon.com. The unit has a larger antenna than the Comfast unit previously mentioned, and appears to use the same Realtek RTL8723BU chipset that the onboard module uses (typo'd in the listing as "Realteck TRL7823BU"). Here's a link to it: https://www.amazon.com/gp/product/B01JYE5BT2
My hope is that by plugging this unit in and restarting the system, the wireless kernel module will pick up the external USB device first and register it as wlan0, making any further configuration unnecessary. If that fails, I'll look into ways to specifically assign my external device as wlan0. Worst-case, I'll open my unit back up and de-solder the USB data pins on the module.
I'll let you know how it goes.
Update -- on my KGL unit, simply plugging in the new WiFi/Bluetooth dongle caused the system to crash when booting. We ultimately had to disable the onboard Realtek chip by cutting the power trace to the board. After that, the system boots right up, and the Wifi works quite well.
wondering if this also means A2DP audio streaming is clear now too?
jpreston84 said:
Update -- on my KGL unit, simply plugging in the new WiFi/Bluetooth dongle caused the system to crash when booting. We ultimately had to disable the onboard Realtek chip by cutting the power trace to the board. After that, the system boots right up, and the Wifi works quite well.
Click to expand...
Click to collapse
Which trace disable power on chip?
Someone test antes USB hub to confirm that It works?
Thanks you
newbie_vlc said:
Which trace disable power on chip?
Someone test antes USB hub to confirm that It works?
Thanks you
Click to expand...
Click to collapse
Please check the post earlier in this thread by GeorgeM269, which shows pictures of the pinout for the board. To be honest, if you cannot use those to determine the pinout of the board, I do not recommend you attempt to cut a trace. You could destroy your head unit, and I accept no liability for that. Do this at your own risk.
- If you have opened the unit, and are looking top-down into the unit, with the face-plate on the top side, and the back panel on the bottom side.
- From that angle, on what I'll call the left-side of the small board, you'll see 4 connections, which are GND, RF0, RF1, CLK. RF0 runs to the antenna connection on the board.
- On what I'll call the bottom edge of the board, there are 6 contacts which have have no connection.
- On what I'll call the right edge of the board, there are 4 connections which represent a USB connection to the system. From top to bottom, these are GND, Data+, Data-, PWR (3.3V). The 3.3V power connection, on the bottom right of the board, is the one we cut.
- Check your results with a meter to be sure you've fully cut through the trace.
For what it's worth, this mod is still working without issues.
I'm not sure what "antes USB hub" is. I can tell you there are no issues with using the USB hub I purchased. Personally, I ended up plugging my USB WiFi/BT dongle onto one of the ports on the rear of the head unit.
GeorgeM269 said:
I have been brainstorming for a few days when I have had a chance to check how this chip could be replaced. While yes, it is surface mounted, it has its own circuit board which is then soldered to the main board. The module looks like this:
and this is the pinout:
I have thought about ways of upgrading to a RTL8821CU instead, since the radio only takes 2.4 GHz wifi signals anyways.
http://www.realtek.com/products/productsView.aspx?Langid=1&PNid=21&PFid=60&Level=5&Conn=4&ProdID=386
Packages are similar (QFN 56 pins) so there should be modules built from these as well.
datasheet: http://en.ofeixin.com/downloadsfront.do?method=picker&flag=all&id=d0dc83f6-b71f-49ae-8469-2c8761f94551&fileId=64&isDownloadPermissions=true&memstate=/members_login.html
I do hear the noise as well, running Malaysk too, it has not been as rough in my experience, mostly only noticeable when the car is stationary. I did have to change the mic because it sounded like I was in a construction zone, lots of random noises during calls.
Click to expand...
Click to collapse
I ordered this USB stick off eBay Link. It has the RTL8821CU chipset with Bluetooth 4.2, wifi ac standard, and 5ghz Frequency. The radio does pick it up as a USB device but it doesn't have a driver built into the kernel. I'm going to see if I can build a kernel module and get it to load. Just a little hesitant to try because if it causes the kernel to crash i'll have to lose my settings/info to restore it as I don't have ADB set up yet.
hi, my wifi on hotspot is very low, i can try to install external module usb wifi dual band, is possible in this radio ? exist module compatible ?
TetsuyaTsurugi said:
hi, my wifi on hotspot is very low, i can try to install external module usb wifi dual band, is possible in this radio ? exist module compatible ?
Click to expand...
Click to collapse
I've found this video, I don't know if it is of any help. But this guy changed the internal antenna for a external antenna and it improved the WiFi signal quality.
https://www.youtube.com/watch?v=3XVcrHv1chk
I do it on my px5 unit. I went to a electronic guy to make the connection. When its done the touch screen stop working. The bad news at those units from china is so cheap and poor designed which i will make a lot of problems if you are trying to mod them. In my case the original wifi antenna was connected on the board! No clip or connector. I think something do wrong the electronic guy.
So if you dont want to damage your unit just let it be.