Develop Bugs

Volume button + WiFi Problems + Touchscreen no reaction + Board computer problems

I have some questions. (Copy from the old thread)
1. I mean that i read it here, but I'm not sure. At the moment I have very often the bug, that the volume button not works. Mute works, but louder and quieter not. I don't know when it doesn't work, but after a while no function.
2. Since a few days I have the wifi problem, that wifi works sometimes and after a while too, it shows empty bars and shows the connection but it doesn't work. In other case if I start the radio he can't find any WiFi. Why?
3. Since a few days the touchscreen doesn't work. I have set, that i can See if i touch. Then it shows a point. so i can see that the touch works, but there is no reaction. After a minuten the radio shows the bootlogo and have a loop. So i have start the radio new with reset or power off from the car.
4. Since a few days if i turn off the key normally all lights form the radio and display shut down. Additionally board computer shut down too after a few seconds. Now the light from the dvd tray is on and board computer too (after a lock from the car too). I dont know why but I don't know if that is so good (Battery).
All this errors are since a few days. I tried to do any settings but the problem is always here. Does anyone no about that? I think it's an app, but I don't know which one. The last chance (if I get no solutions) is to install another rom? That is really crazy, because it's only since a few days. The days before it works perfect.
I have JY 2.73 with the Malaysk Rom from September (1024).
Thanks

Update: Now i installed 2.59 JY and tried again. WiFi will always gone with no bars. So i turn off and turn on again. At the most cases it works. But the problem is here again. The same with the touchscreen crash. 3G doesn't work. always no bars.
So the previous MCU doesn't work again. Maybe a software error.

Could you please try to measure the voltage alignedto the HU while you encounter those problems? I rellay mean at the radio side (so not at the battery poles).
Such issues could be lack of voltage. If not and flashing does not solve it could be a defective unit.
Just to ensure: You flashed Firmware AND MCU? AM I right wit this assumption?
If not: Try to flash a new ROM first (probably try Malaysk ROM)
Btw: Moved to Q&A

dark alex said:
Could you please try to measure the voltage alignedto the HU while you encounter those problems? I rellay mean at the radio side (so not at the battery poles).
Such issues could be lack of voltage. If not and flashing does not solve it could be a defective unit.
Just to ensure: You flashed Firmware AND MCU? AM I right wit this assumption?
If not: Try to flash a new ROM first (probably try Malaysk ROM)
Btw: Moved to Q&A
Click to expand...
Click to collapse
Thx for answer. How can i measure that? Do you know which cable it is? And if the cable shows not the 12V? What can i do to fix the problem?
Sure. I have Malaysk Rom and the MCU JY 2.59.

you would have to get amulti- or vooltmeter and attach that between plus and ground pins at your HU.
If you don't know how you should eigther try to follow another way first if possible or ask someone to do it for you (it's electrics)

dark alex said:
you would have to get amulti- or vooltmeter and attach that between plus and ground pins at your HU.
If you don't know how you should eigther try to follow another way first if possible or ask someone to do it for you (it's electrics)
Click to expand...
Click to collapse
Thanks. I ordered a multilmeter. Maybe it's the battery. At the moment the car works really hard if I start it. The radio takes so much battery but the radio is off. So that can be the problem.

low voltage can cause many weird problems but you have to know a new battery might not solve your problem!
If you have low voltag while the engine is ruunning then you have a different problem. eighter there is a connection issue somewhere on the path the energy takes from battery and generator to the HU or your generator might have a problem. But that is open to check when we know if it really is a voltage issue.

Hi,
i'd like to give you an update for my problems. Since the last days I have the problems, that my car didn't start. Now we see, that the battery is nine years old. Now I charged the battery (tomorrow I'll get a new battery) and the first test shows WiFi works for 3 minutes. I know - that's not a lot, but I only can try if I have the new battery. 3G doesn't work - always the same. But that's not so important for now.
At the moment I don't have the volume error. I will test it, If i have a longer car drive.
The problem with the touchscreen is actually. Since a few time, after few minutes the touchscreen is bricked and I see the points that i touch it, but I can't click anything. If I touch ten times, twenty times or often then radio shut down and shows the boot logo... forever... it doesn't boot again. So I have to make a hard reset.
And the last point with the light board computer and the light dvd slot after plug off the key is actually too. It don't shutdown the lights on the standby time from 10 minutes (set it to 10 minutes). I know now, that I can shutdown it completely if I press the volume button for 3 seconds. Than it's turn off. So it's a setting problem from the firmware?
Today I plug in the key - nothing. Radio doesn't start. So I looked behind the radio and saw, that one thin cable is not in the wiring harness and I can see the wires on the cable. So I tried to put it in the wiring harness again. I hope it works longer now. I wrote carjoying and ask for a new wiring harness. Maybe all problems will be fixed, If i have a new.

Hello again,
now I've got a solution for the wifi problem. I've tried to connected wifi - i Known that doesn't work only few seconds and after a few seconds it shows 0 bars on wifi... now I disconnected my 3g stick and LOOK it works... full bars, no losing connection. I connect 3g again and the same problem after a few seconds.
So th3 3g stick (E1750 from Huawei) makes some problem OR the usb cable?

Huawei E355 also not working. Same connection problems with malaysk rom MTCD
Any suggestions?

GPS issues

Hi I am running S.rom Marshmallow.
I am having GPS not locking issue or it doesn't work at all.
In Maps if I try to navigate , my location will be stuck at a particular point ( that too off by several metres )while I'm moving. Tried GPS apps from play store , nothing works.
Firmware ,radio , hboot all latest updated.
Does anyone have any solution for this?

Have you dropped your phone or had it repaired?
The first time I broke my screen and fixed it, I accidentally bent the gps pin in and had very poor GPS
I fixed it and then my daughter dropped my phone, the GPS connector completely fell off and I had to resolder
The GPS connector is located by the power button. It's a little gold pin that sticks up and touches the metal casing. It is located at the very top of the phone and looks like a square.
If not a physical issue, check the GPS accuracy settings

JY (RK3066) Backup Camera Problem

I've been having a strange problem with the backup camera on my JY unit (RK3066 - Malaysk ROM). I use a wireless transmitter to get the signal from the camera to the unit.
In cool weather, everything works perfectly. In hot weather, when I first start the car, I get a black screen with "no signal" until the AC has cooled down the inside of the car a little - then it works perfectly again.
At first I thought that the wireless receiver for the camera may be a little heat sensitive and doesn't work when its too hot. BUT...
The other day (it was hot again) I started the car, and it worked...perfect picture. The head unit booted and suddenly the picture turned black with "no signal".
This behavior makes me wonder if there is something in the software that turned the picture off.
Has anyone experienced something similar?

mimpoca said:
I've been having a strange problem with the backup camera on my JY unit (RK3066 - Malaysk ROM). I use a wireless transmitter to get the signal from the camera to the unit.
In cool weather, everything works perfectly. In hot weather, when I first start the car, I get a black screen with "no signal" until the AC has cooled down the inside of the car a little - then it works perfectly again.
At first I thought that the wireless receiver for the camera may be a little heat sensitive and doesn't work when its too hot. BUT...
The other day (it was hot again) I started the car, and it worked...perfect picture. The head unit booted and suddenly the picture turned black with "no signal".
This behavior makes me wonder if there is something in the software that turned the picture off.
Has anyone experienced something similar?
Click to expand...
Click to collapse
Hello,
I was having a issue where hu would out of the blue switch to backup picture and get a no signal sign and then on its own go back to normal and do this at random. Turns out the wire i was using for trigger signal and ground and voltage was not big enough. Once I replaced them its working like it should now. That is the only issue close to yours that I have had.

SiteRnr said:
Hello,
I was having a issue where hu would out of the blue switch to backup picture and get a no signal sign and then on its own go back to normal and do this at random. Turns out the wire i was using for trigger signal and ground and voltage was not big enough. Once I replaced them its working like it should now. That is the only issue close to yours that I have had.
Click to expand...
Click to collapse
I have read about your problem somewhere hoping to find a hint, however, the switching back and forth works fine in my case.

Ya, I've the same problem. If the problem continues, you can use a power relay.

PX5 stuck showing warning image, buttons unresponsive.

I just bought a PX5 unit, which seemed to be working perfectly until I finished installing it into my car and now it has become unresponsive with a black screen and a yellow rhombus with an exclamation point in the middle (unable to upload image as new user).
If I turn off the ignition, it will turn the stereo off and the android screen briefly shows before going into sleep. None of the buttons are allowing me to get past the screen and in to android. The reset button seems to do nothing, android is definitely running in the background, just unsure as to why this screen will not close. Any ideas?

Hi, I think I saw a yellow rhombus with an exclamation point when I was installing my radio and rear view camera was not connected to the radio. I think that it is a warning about missing video signal when radio is displaying live feed from a rear view camera.
So, one explanation for your issue could be that the radio thinks you are reversing, and the rear view camera is not connected to the radio. If I understand it right, radio can switch to rear view camera display mode based on two conditions 1) canbus information 2) +12v trigger signal.
For the condition 2), you could check that nothing is unintentional connected to reverse detect wire. If that does not help, then you could perhaps try to disable reverse view feature in the configuration menu before installing the radio to the car and/or find a working canbus configuration settings.
Please notice that I'm a beginner with Android head units and your problem might well be something totally different!!

Thanks for your reply. Some of your post seems to relate to my issue definitely, I think it is linked to the rear view camera which is currently disconnected. However I am unable to get into any configuration options. None of the buttons/resets I try get me past the exclamation screen, I can only see android once I turn off my ignition when it tells me it is closing down. None of the various reset button combinations seem to do anything with my head unit either, can't seem to reset it properly. Its strange, I will reattach the camera tomorrow and see if that brings any joy. I don't know anything about this stuff myself but I am wondering if I did something to the head unit to brick the non-android side somehow.
Edit: Unfortunately reattaching the camera did not change anything.

Update. I have managed to find a way in to the Android side if I connect my phone via bluetooth to the stereo, it then lets me use the split screen function via the top bar menu to put the warning screen other screen to the side, however whenever I touch the screen or attempt to use the android interface, my stereo goes back to the warning screen, none of my inputs via the stereo buttons or the touch screen seem to be registering with the Android side? Very confused. I have also tried as many button combination resets I can find and I have not been able to successfully get into the recovery menu, or any change except rebooting.

Was your unit professionally installed?
Also, what did the re-seller suggest when you contacted them for support?

No the unit was not professionally installed. I am not sure how I've become stuck with the problem. I made some minor changes in factory settings but nothing I thought would of caused this. The seller is yet to respond and its been a couple of days, but I have requested the hardware reset methods for this unit or any other solutions.

deano35 said:
No the unit was not professionally installed. I am not sure how I've become stuck with the problem. I made some minor changes in factory settings but nothing I thought would of caused this. The seller is yet to respond and its been a couple of days, but I have requested the hardware reset methods for this unit or any other solutions.
Click to expand...
Click to collapse
Check the reverse wire on the back of the unit...if necessary disconnect it to ensure no reverse signal is received.
If your unit can boot into android normally then you will have to figure out why the reverse wire is receiving signal .
Check your connectors to avoid any of them to be loose.
Enviado desde mi SM-G950F mediante Tapatalk

Everything has been disconnected from the unit except the power cable to car and and canbus, from what I can tell nothing is loose. Unit will not boot without the canbus box whatsoever, not sure if that is meant to happen.

deano35 said:
Everything has been disconnected from the unit except the power cable to car and and canbus, from what I can tell nothing is loose. Unit will not boot without the canbus box whatsoever, not sure if that is meant to happen.
Click to expand...
Click to collapse
Yes, canbus decoder need to be connected for power up the HU. If you dont need the decoder box you need rewire the harness.

I think I am going to have to request a refund and return it. Still no reply from the reseller and I am not sure what else I can try, everything that is not needed to power it has now been removed. I can't send links or else I would update the thread with a video of the touch/physical buttons being completely unresponsive even when I manage to get to Android. The unit has definitely developed a fault and I am unable to reset it. Admittedly it could be my fault somehow as it was working for the first few boots, but unless they give me something to try I am just going to have to send it back.

Quick bump. Has anyone got any further ideas? I bought off Aliexpress so contact with the seller is slow and painful, they do not seem to understand the issue and just keep telling me to disconnect all wires and reconnect. Which has been done many times. If anyone wants to post a link to the video for me I would be happy to send them it privately.

deano35 said:
Quick bump. Has anyone got any further ideas? I bought off Aliexpress so contact with the seller is slow and painful, they do not seem to understand the issue and just keep telling me to disconnect all wires and reconnect. Which has been done many times. If anyone wants to post a link to the video for me I would be happy to send them it privately.
Click to expand...
Click to collapse
I would start a dispute with them. I had a device that they sent with similar problems and plenty of issues, which they would not help with or would not understand. Best option is to dispute to get a new device or a full refund. Could you send the video?

xLeviNx said:
I would start a dispute with them. I had a device that they sent with similar problems and plenty of issues, which they would not help with or would not understand. Best option is to dispute to get a new device or a full refund. Could you send the video?
Click to expand...
Click to collapse
Yeh I have a dispute open currently, just was hoping it would inspire the seller to actually offer up a working way of resetting the device. Had to add link below seperately as needed to be ten or most posts.

https://www.youtube.com/watch?v=ujHacKESAT8&feature=youtu.be
The stereo defaults as the warning image black screen and I can only get android up using the multiwindow button with a long press. Then the android side will not register any input and will keep trying to put the black screen to the front.

Update: I have been told by Aliexpress I can have a partial refund and keep the unit, or a full refund if I return to China. Anyone have any ideas how I would go about resetting the unit if I took the partial refund? To be honest I think my only option is to return it and get the full amount back but any ideas would be welcome! Shipping to China and awaiting a refund is going to take weeks, would rather just get it working if possible.

deano35: any progres? I have the same problem as you. This is my post from PX5 MTCD/E Head Unit Discussion Thread
" Hi , I have https://s.click.aliexpress.com/e/DtwdJIt its px5, Mtce_gs_v2.90c. Now I have a little problem with rear camera. I bought reverse camera and tried to connect it into front camera input(I was curious how it would look like) and since then its stuck on camera view. Even after disconnecting camera. Only solution was disable "prohibit reverse" in factory settings menu, but with "prohibit reverse" disabled is obviously not showing reverse camera when I gear the reverse down. Everything is shown in this video. https://photos.app.goo.gl/XbYUHApzT8qTezkq6 Thanks for any advice. "
Take a look on the video, its similar as yours.

Wifi problem after screen replacement

Hey guys,
After I broke my display a few weeks ago i bought a replacement screen + digitizer and repaired it. I also changed the battery. Everything worked fine afterwards.
Mobile connection, gps, speaker, camera, fingerprint reader, everything. Just the wifi doesnt seem to get a propper signal.
I have to stand right infront of the router for it to find the connection and even then its not stable.
Before the repair everything worked fine. I guess it has to be a problem with the connection from the wifi
module to the antenna? But i cant seem to figure out where the contacts are to check.
All the pins at the backside of the motherboard which connect to the battery case seem alright.
I looked for this problem on and I found a few people who had a similar problem but no solution
other then clearing the network cache or factory resetting which didnt help for me.
Another idea i had after looking for a solution for other phones aswell was that I might have accidentally switched 2 screws around on the upper motherboard because some of those create a connection aswell right? Gonna look at them the next time i have time to open it up.
I have oxygen with twrp and rooted it with magisk if that information is needed but i dont think its a software problem because it was working fine before.
Thankful for any kind of help.

I had some time opening it up again. All the right screws are in the right places and the antenna cable is also plugged in correct on both sides.
Any help regarding where the wifi connects to the antenna at the back of the phone or help in general?
Thanks already

Same problem on my OP3T, I've only opened it to replace camera, earpiece and loudspeaker.
Also bluetooth does not work and GPS is slow to get position.
I don't know what to do. It seems an antenna problem.
Any idea?