Database Info

Black screen & no recovery!!!!

Hi all !!! Sorry for my English but I need your help
I commented what is happening with my phone N5 (which for good and evil is always stock without root or anything, with corresponding OTA updates.)
1- Yesterday afternoon at lunchtime while reading a book in playbooks, I notice that suddenly disappears one line and then appeared intermittently. I close the app and noticed the same thing happening on the screen menu. I shut down the cell and turn on again and I thought it must be an application be kidding. But still does.
2 Also yesterday I happened to change the security on the phone screen. After a while of normal operation, try to turn it on the screen with the button, nothing, the screen goes "black", with light and retrolight turned on but no picture no nothing .
Called the cell to see if it works or is turned off and the phone rings but the screen nothing. Try turning it off and on again by holding the on / off / lock button and the phone restarts, but the screen nothing. In one such attempt to do the above it is seen that managed to turn it off. And I get it on and do a normal boot, except that the picture of my screen is changed to the original. Change the lock screen which was previously using (slip). And it seemed that out or some conflict with the lock. In one of those again pressed the ON / OFF / lock as would normally and it starts all over again.
After I magically back to life, I want to make a full wipe as I think it should be an app that is doing some conflict or something. BUT ....
3I turn off the phone and then press the keys VOLUME UP / DOWN and ON / OFF is normally off, squeezed the first screen with the options but options RECOVERY / BOOTLOADER appears in red I choose RECOVERY give the ok with the key and .... andriod robot appears with the legend below that says something (I do not remember well) without or without controls options appears. So its seems thatI dont have recovery.
After that keep pressing the key ON / OFF and the phone turns off and / or reboot normally. All this I did it again to see if the error reappears and looks that I do not have recovery.
The failure of the screen is increasing. I dont know if they are separate problems or is it all the same problem.
Sorry if I was too long but I need the help of you.
UPDATE Now it seems that the screen died, since I do not achieve to turn it on as before, the light and the retrolight its ok. The phone receives calls and notifications but the screen stills black.
Thanks all.
Matias M 73

the android laying on its back IS the atock recovery.

simms22 said:
the android laying on its back IS the atock recovery.
Click to expand...
Click to collapse
thank you simms22 but I need to fix or understand what happend with the screen first.
:good::good:

Matias M 73 said:
thank you simms22 but I need to fix or understand what happend with the screen first.
:good::good:
Click to expand...
Click to collapse
sometimes things just "derp". itll happen more often if you dont reboot your phone often. also, your phone will be a little bit more responsive if it gets reboot once a day or two.

RMA or fastboot it back to stock, if the screen doesnt turn on afterwards then it looks like a hardware issue, open device and reconnect the display.

republicano said:
RMA or fastboot it back to stock, if the screen doesnt turn on afterwards then it looks like a hardware issue, open device and reconnect the display.
Click to expand...
Click to collapse
Thank you Republicano!!
I think too that its a hardware issue. I already see on you tube problems like mine.
Thanks again!!

When buttons (and volume knob) stop working

All the buttons, including the volume knob stop working.
It has happened several times on my android 5.1.1/mtcd/joying unit.
When it happens the boot process is strange. It spends a while displaying the car logo, then it displays the desktop for a second or so and then it displays the car logo again. It sort of looks like it boots twice.
Wiping the dalvik cache does not fix the problem. I have to factory reset or wipe everything from recovery to get the buttons working again.
I am currently using malaysk rom for MTCD units but I had exactly the same issue on the stock rom.
I think the problem is related to autostarting apps on reboot.
Today it happened after I installed the Sygic speed camera/traffic alert app. Everything worked fine for a while, until I chose to auto start it (from the settings menu inside the Sygic app), rebooted, and the buttons no longer worked.
To check if the autostart option really caused the problem I installed the app again, chose to auto start from the settings inside the app, and the same thing happened. Buttons no longer worked.
The issue is not specific to Sygic, as I have had the same issue with other apps.
Now I use tasker to autostart the app. It has survived a few reboots. I hope it lasts.
Does anyone understand the boot process on these units well enough to help debug it further?
It would be nice if I could fix it the next time it happens, instead of having to wipe/reinstall everything.

It seemed to be completely random for me... and it stopped happening as randomly as it started.
I posted the process I went through to get them back (reboot, reboot to recovery, reboot again, etc) but very intermittent.

I experience this whenever I reboot from the power icon in the taskbar. It seems to have started after upgrading to Malaysk's version 4. I have verified this on two Joying units. My workaround is to reboot with the reset button when I have to.

I have not had any apps autostart since the last time it happened, but the buttons stopped working again a few days later, and the "double boot" came back also. The reset button did not help.
A factory reset from the settings menu made the buttons work again.
I was using the latest joying rom and MCU. Spotify, iGo navigation (from joying) and the TomTom speed camera app were the only "extras" installed if I remember correctly.
I am about to give up on the (JY-UL135) head unit now. Unless someone has suggestions on what to do.

xdamember2 said:
I experience this whenever I reboot from the power icon in the taskbar. It seems to have started after upgrading to Malaysk's version 4. I have verified this on two Joying units. My workaround is to reboot with the reset button when I have to.
Click to expand...
Click to collapse
xdamember2, i think you are right. Power icon in the task bar is the root of evil.
Today i've had the same experience. But with the buttons, the sound had also disappeared. Pushing hardware reset button had fixed the problem.
So I suggest to remove power icon from the task bar.

This happened to me yesterday, but as well as buttons/steering wheel control, all sound output stopped working! No radio, music or navigation sounds. Tried a reboot, but in the end only a factory reset did the trick as specified previously.
Very frustrating!

This happened to me again today for the second time. While driving the screen turned to white/black static like moving artifacts and the sound cut off. After holding the power button to reset the buttons are not working. I'll update to Malaysk's Rom v5 now but looks like my apps are wiped again...

i've been on v5 for the past few days and i haven't witnessed this behavior.

Any luck with the buttons and sound stop working? It`s the same with version 6 of this ROM which i like way better then the stock ROM. I`v noticed that any other reboot except the standard one, when the HU shuts off by it self, will make buttons unusable and no sound. The first time it happen to me was when i did some changes in the "factory settings" menu that needed to reboot the device. The only way i managed to fix it was to do a factory reset. Tomorrow will try to flash the same ROM (V6) without wiping to see if this will fix it,because they don`t work again now after rebooting from the power icon . Lets hope someone finds solution for this annoying issue.

MY FIX for Volume knob not working on Android Head Unit
Hi All
I updated my generic Ford Focus PX5 android head unit, and after much swearing and reading on here, I still was unable to fix the top left volume and top right tuning rotary knobs as they had stopped responding.
Eventually i started mucking about with Factory Settings and in the "OTHER" section I looked at "Knob Mode"
Experimenting with the various settings I eventually determined that for me, "2 10K/20K ADC Ports" works. I now have fully functioning controls.
I hope this is of some help to you guys!

I had been fooling with the settings of my Android head unit and some days later realized my volume knob wasn't working. That knob was a big factor in my purchase of this unit. After fooling with a dozen or more logical sounding settings, I happened upon the setting which had to do with 'Key lights'. Here's the fix:
From 'Settings' go to 'Factory Settings' and enter code 8888. Go to 'Key Light Settings'. On 'please open the debug button lamps' press 'OK", slide the screen up and turn off 'whether to turn on the colorful lights'. Back on out and the volume should now be working. Hope this helps

Sdgz said:
I had been fooling with the settings of my Android head unit and some days later realized my volume knob wasn't working. That knob was a big factor in my purchase of this unit. After fooling with a dozen or more logical sounding settings, I happened upon the setting which had to do with 'Key lights'. Here's the fix:
From 'Settings' go to 'Factory Settings' and enter code 8888. Go to 'Key Light Settings'. On 'please open the debug button lamps' press 'OK", slide the screen up and turn off 'whether to turn on the colorful lights'. Back on out and the volume should now be working. Hope this helps
Click to expand...
Click to collapse
I recently bought a new android head unit. All are working well except the original volume knob of the car. Sometimes i must turn it 4-5 clicks for the volume to move 1 click, and other times i may turn it 10-15 clicks and the volume does not respond at all. This is very frustrating! I found a solution on youtube which says factory settings-other- and uncheck the wheel3 option, but my head unit doesn't have this option at all. I hope your solution will help me!
Update : I searched for this solution you mentioned but this option does not exist in my factory settings with 8888 code. Only car logo. I dont know what to do....

FM Radio has no signal at all?

Have a new China headunit with android 7.1.2 and first there was no FM radio. Searched XDA and with password m123456 got into factory settings and there the radio stood OFF?? Changed it to ON and after restart it was there. But there's no signal, no sound, nothing. Anyone ideas?
Also, this is a monitor with no buttons. How do you get in recoverymode when there's no on/off button? I only have the reset possibility (little hole on the side of the monitor).
Info headunit; see attachments

pgee said:
Have a new China headunit with android 7.1.2 and first there was no FM radio. Searched XDA and with password m123456 got into factory settings and there the radio stood OFF?? Changed it to ON and after restart it was there. But there's no signal, no sound, nothing. Anyone ideas?
Info headunit; see attachments
Click to expand...
Click to collapse
Did you select your country as well ?

If you mean the region for the radio in factory settings, I did.
If you mean region in Android, like date and clock? Somehow I only can set it manually. If I choose automatic date/time it stays on Chinatime?

And do you have your radio antenna Installed?
For going into recovery:
Press reseat button until you see flashing the button lights..(approx 25sec)
Release and press again until see your nougat logo.
Release and wait for recovery menu
Enviado desde mi SM-G950F mediante Tapatalk

Radio antenna, isn't that the microphone? There's no separate antenna plug? See https://www.seicane.com/android-hd-...hd-1080p-video-steering-wheel-control-s018848
Recovery; press reset button until you see flashing the button lights.. (approx 25sec) >> what button lights flash? There are no buttons

WOW would you look at that unit !! Does it drive the car for you too !!?? lol Judging by the pictures it must be on the box somewhere but when zooming in I cant see if/where it would say ANT..

Yes, looks impressive, car almost drives itself . Works very well, nice touchscreen, only no radio signal. Also the steering wheel buttons can't be changed. But they work well, although would be nice if I could customize them.
Sorry to say, but there's nothing on the box for a Antenna. The only thing saying something about an Antenna is on the big plug/connector witch connects to the original radio. On the attached picture there are 2 pins ANT. Does it use the original car antenna through the connector of the original radio?

It says that it syncs with the cars bluetooth have you been able to get and kind of sound with it ?

Your new unit don't have radio, the radio is from stock unit, you must have to connect your new unit in conjunction with the stock unit. And there is a "app icon" that switch to original menu and there's your radio.
You just change the stock screen for the new one and connect the original cable of the stock screen to the connection labeled car lvds

Cid6.7: yes, bluetooth works fine and the sound is good!
Hugovw1976: I did not know there wouldn't be a radio in Andorid. I can switch between stock and Android. But, when I go to Android the stockradio stops. The only way to go from stockradio to Android is when I push long the GPS button on the steeringwheel. Stockradio keeps playing and GPS (IGO) starts on the screen. I can go back to the radio but then the GPS stops.
Are you saying there isn't even a FM receiver in the central box?
Oh, and thanks for the replies, now we are getting somewhere.

pgee said:
Cid6.7: yes, bluetooth works fine and the sound is good!
Hugovw1976: I did not know there wouldn't be a radio in Andorid. I can switch between stock and Android. But, when I go to Android the stockradio stops. The only way to go from stockradio to Android is when I push long the GPS button on the steeringwheel. Stockradio keeps playing and GPS (IGO) starts on the screen. I can go back to the radio but then the GPS stops.
Are you saying there isn't even a FM receiver in the central box?
Oh, and thanks for the replies, now we are getting somewhere.
Click to expand...
Click to collapse
I install a similar unit (the central box is the same) on a Audi Q3 an there's no radio.

Thanks, that makes everything clear. Do you have experience with the steering wheel settings? When I turn it on in the factorysettings and restart the system it comes up in Android settingsmenu. When I start it up I get a black screen?

When in recovery mode how to scroll in the menu?
Or does the touchscreen work in recovery mode?

pgee said:
When in recovery mode how to scroll in the menu?
Or does the touchscreen work in recovery mode?
Click to expand...
Click to collapse
Usually with the same reset button...
Short press-》 move to next option
Long press -》 validate option
Enviado desde mi SM-G950F mediante Tapatalk

pgee said:
Thanks, that makes everything clear. Do you have experience with the steering wheel settings? When I turn it on in the factorysettings and restart the system it comes up in Android settingsmenu. When I start it up I get a black screen?
Click to expand...
Click to collapse
Sorry I can't help

Learned from another topic when you have Canbus you can't set the steering wheel keys

ikerg said:
And do you have your radio antenna Installed?
For going into recovery:
Press reseat button until you see flashing the button lights..(approx 25sec)
Release and press again until see your nougat logo.
Release and wait for recovery menu
Enviado desde mi SM-G950F mediante Tapatalk
Click to expand...
Click to collapse
Hi, can't get into recovery.
Do I have to press reset button when unit is off or on?
Took power cable off, pressed reset button, put power cable on and followed your instructions. Did not work.
Please advise.

Solved:
First in the systemmenu there was no way to activate developer settings in the normal way. Solved this with Total Commander.
Bought a USB cable, in my case A to A. Couldn't get in because USB standard is set on 'Host' and it is not possible to connect with a OTG cable.
In factorysettings wrote 'abdon' and immediately the headunit came up on the with USB connected Windows PC .
On PC choose to see the files. It works!
Downloaded latest SDK. Opened commandprompt and changed dir to the SDK directory.
Put in command: 'adb devices' (without the quotes) and there it was!!
The command that worked for me to get into recovery is: 'adb reboot recovery'
Only problem left: fastboot is not working in recovery mode. I think the problem is that the USBconnection goes back in Hostmode when booting into recovery. Anyone now how to solve this?

Honda Audio Navigation Unit stuck on Boot-Loop

Hi,
This is my first post on this forum and i am hoping members here will help me solve my issue. I have a Honda HR-V 2016 LX that came with a non android unit. I later purchased a Honda Navi unit from ebay UK that was pulled from a Honda HR-V 2017. The unit worked fine and later I downgraded to RC6 firmware so that I could install additional software from CMdroid. The problem started when i tried to change the skin through system settings, the unit gave a notification that system will restart and since then it is in continuous boot loop. Now this is what i have done till now :
a. disconnected battery for over 15 minutes. No change
b. tried to boot the system through USB with firmware RC6, It updated fine with progress bar and at the end got the message update successful and USB can be disconnected but at restart it still remained in that loop.
c. Again booted with USB having RC8 successfully but no luck
I feel that I need to do a factory reset to get my audio working again but unfortunately it is not booting up to the point that soft keys get illuminated. The reverse screens powers up but without guidelines. I don't want to lose my unit. Please help me recover it.
Regards

Members I need help here. Please some one suggest me a solution to get my audio unit working again. Today I reinstalled the firmware and it went smooth but on restart the system continues to reboot.

Hi Panther3, did you ever get to the bottom of this, the same thing has just happened to mine?

Scooterpop said:
Hi Panther3, did you ever get to the bottom of this, the same thing has just happened to mine?
Click to expand...
Click to collapse
I actually have a 2nd honda navigation unit that has this issue... Been trying to work on it but no luck till now...
So I am curious if someone manages to make it work ^^
here is the official solution from the manual... :
Some units might experience "H screen stuck on"
symptom. Initially the software update will not be
possible when the unit is "H screen stuck on". You will
need to follow these steps before attempting the
update:
• When unit is in fail mode "H screen stuck on",
Press and hold the Power and Day Night button at
the same time for five seconds.
Note: Wait until the loading circle appears on the
screen and then press the Power & Day Night
button.
After five seconds the unit will switch into the
reboot mode, then the unit will do a file check
during rebooting. Rebooting will take
approximately two and a half minutes.
• Now continue with software update procedure.
Note: The "H screen stuck on" symptom can be
caused by software or a hardware failure. In case of
a hardware failure, recovering is not possible and a
new RM unit is necessary.
Click to expand...
Click to collapse

Kanor MTCD Unit after Factory reset not booting

Hello,
i have a major (hopefully minor) Problem:
My Unit MTCD or E probably GS from KANOR, like this one with other backside
https://de.aliexpress.com/item/32842109142.html?spm=a2g0o.productlist.0.0.11677d2dA88rUK&algo_pvid=edfcdfee-6506-42f2-a19d-be2ab538f188&algo_expid=edfcdfee-6506-42f2-a19d-be2ab538f188-0&btsid=e523b817-3495-4acd-960d-716f43a94e62&ws_ab_test=searchweb0_0,searchweb201602_8,searchweb201603_52
Model Name:
KN-U702C
Bought it in 2019, it was working flawlessly....
I now want to sell my car with the hu, and went into the factory settings with the pw: "126" and resetted the hu ("Tablet is restarting" was shown on the display)
After that, no reboot from the hu.
Screen remained black.
I pushed the Reset button in the lower left corner, nothing.
I held down the Power (volume knob) Button for more than 10 seconds.... Buttons are flashing 3 times....nothing. Screen remains black.
I disconnected the hu fron the car, waited overnight, connected it again, but nothing, no boot sequence is shown, screen remains black.
Can somebody tell me what to do to get this unit working again?
Best regards from always rainy, gool old germany

I can not remember exactly but this happened to me. I followed the information in his signature from this post somehow.
Blank screen and confused
I have a px5 radio packed as kanor. It is a px5(1024x600) running 8.0 with mtce_kld_v3.01_1 and has physical buttons. It was running ok. I went into factory settings and changed the led color and changed the mapping on one button. It said it...
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