Develop Bugs

rk3066 dead

Hey all. I have an RK3066 head unit (for VW Golf) that I bought last April from AliExpress. It worked fine for half a year, and now it has gone completely dead. It just doesn't do anything at all. When I have it plugged in in the car and the power is on, I can measure it with a multimeter that there is right voltages in the components and there seems to no physical damage. So the power supply is okay, I guess.
The display just remains dark.
Is there anything I could do to find the problem? The seller in AliExpress advertised one year warranty, but when I approached him with the problem he deleted his profile completely - nicely done.
And if there is nothing else I could do, are the displays for these things available to order as spare parts?

miika. said:
Hey all. I have an RK3066 head unit (for VW Golf) that I bought last April from AliExpress. It worked fine for half a year, and now it has gone completely dead. It just doesn't do anything at all. When I have it plugged in in the car and the power is on, I can measure it with a multimeter that there is right voltages in the components and there seems to no physical damage. So the power supply is okay, I guess.
The display just remains dark.
Is there anything I could do to find the problem? The seller in AliExpress advertised one year warranty, but when I approached him with the problem he deleted his profile completely - nicely done.
And if there is nothing else I could do, are the displays for these things available to order as spare parts?
Click to expand...
Click to collapse
there could be multiple areas to be tested
the problem could be the fuse, the mother board, the RK3066 , the screen itself or the board by the screen
if it is a joying unit I can test and repair it for you and could cost you from 75 to 250$ depending what needs replacing.
in USA only.

Mtcd px3 to px5 upgrade wont power up

Hi
I managed to brick my PX3 MTCD unit so decided the PX5 upgrade was the way to go.
The problem I have is that if I power off the unit it will not power on either by acc 12v or the power button.
It will power on if I remove the mainboard and reinstall it while the unit is powered.
Is this a hardware or software issue and is there a fix?
Thanks

mclivesey said:
Hi
I managed to brick my PX3 MTCD unit so decided the PX5 upgrade was the way to go.
The problem I have is that if I power off the unit it will not power on either by acc 12v or the power button.
Click to expand...
Click to collapse
Ok, so the first question is how exactly did you brick the PX3?
Because if for example you messed up the MCU, changing the SoC board won't do anything to help.
mclivesey said:
It will power on if I remove the mainboard and reinstall it while the unit is powered.
Click to expand...
Click to collapse
That's a really dumb thing to do. You should always power the unit off before adding and removing things.

Flashing a bad rom killed the PX3 and cant seem to reflash it.
The PX5 board works fine once powered up. it's just it wont power up by using usual methods.

Android 9.0 PX5 4+64GB no illumination in knobs and keys

i have bought this radio Android 9.0 PX5 4+64GB car DVD player Built-in DSP Car multimedia Radio For Toyota Avensis T25 2003-2008 GPS Navigation
everything works fine but i have one problem.
the first couple of days the illumination on the knobs and buttons worked fine. now the have no light at all. i have checked the illumination cable and it is correclty connected, plus when i turn the lights of the car on the radio gets dim, so it gets a signal.
i have gone through the factory setttings and made the lights to turn on by power instead of lights.
but still no luck.
any thoughts before i open it and see whether a cable is loose?

https://www.aliexpress.com/item/4000087601079.html?spm=a2g0s.9042311.0.0.27424c4d5FePYt

What does reseller suggest?

marchnz said:
What does reseller suggest?
Click to expand...
Click to collapse
Probably the ribbons buthe is not sure

Have you thought about fault finding the LED control circuit if you have the experience to do so.

marchnz said:
Have you thought about fault finding the LED control circuit if you have the experience to do so.
Click to expand...
Click to collapse
No experience to track it
Guess i should take tlot to a local store

cchristos said:
i have bought this radio Android 9.0 PX5 4+64GB car DVD player Built-in DSP Car multimedia Radio For Toyota Avensis T25 2003-2008 GPS Navigation
everything works fine but i have one problem.
the first couple of days the illumination on the knobs and buttons worked fine. now the have no light at all. i have checked the illumination cable and it is correclty connected, plus when i turn the lights of the car on the radio gets dim, so it gets a signal.
i have gone through the factory setttings and made the lights to turn on by power instead of lights.
but still no luck.
any thoughts before i open it and see whether a cable is loose?
Click to expand...
Click to collapse
Have you tried: factory settings> other? > led type

CAnderson60 said:
Have you tried: factory settings> other? > led type
Click to expand...
Click to collapse
unfotunately yes. the seller responded its a hardware problem

I had this issue on my PX5 unit. Then one day the entire unit went dead and would not come on. I opened my dash back up (very hard work on a MINI Cooper) and it turned out a cable had come out. I re-affixed the cable and the unit was fine, and also the lights were back on. I'd triple check all the cable connections.

KitF said:
I had this issue on my PX5 unit. Then one day the entire unit went dead and would not come on. I opened my dash back up (very hard work on a MINI Cooper) and it turned out a cable had come out. I re-affixed the cable and the unit was fine, and also the lights were back on. I'd triple check all the cable connections.
Click to expand...
Click to collapse
thank you for the reply my friend. the seller has sent to me , new buttons , so i had to recable the whole thing again. everything works but unfortunately no lights.

cchristos said:
thank you for the reply my friend. the seller has sent to me , new buttons , so i had to recable the whole thing again. everything works but unfortunately no lights.
Click to expand...
Click to collapse
Maybe you have a similar problem as me. Faulty key backlight control. Motherboard malfunction.
read:
https://forum.xda-developers.com/an...-backlight-t4050499/post81756829#post81756829

elman2020 said:
Maybe you have a similar problem as me. Faulty key backlight control. Motherboard malfunction.
read:
https://forum.xda-developers.com/an...-backlight-t4050499/post81756829#post81756829
Click to expand...
Click to collapse
probably mine has the same issue, but i cannot afford to send it back to china and wait 3 months to get my radio back. guess i will have to live with it. this will be the last time i buy such an expensive item from china directly. i would have paid more in my country but at least i would have a usable warranty

cchristos said:
probably mine has the same issue, but i cannot afford to send it back to china and wait 3 months to get my radio back. guess i will have to live with it. this will be the last time i buy such an expensive item from china directly. i would have paid more in my country but at least i would have a usable warranty
Click to expand...
Click to collapse
I fixed the radio today. I did not replace the damaged part, I connected the backlight directly from the power supply. Works well.
Cchristos, do you have the option to take a photo of the motherboard? Post to forum or send me an email. This area as in my picture. I have already repaired the radio, but I would like to know what part it is.

elman2020 said:
I fixed the radio today. I did not replace the damaged part, I connected the backlight directly from the power supply. Works well.
Cchristos, do you have the option to take a photo of the motherboard? Post to forum or send me an email. This area as in my picture. I have already repaired the radio, but I would like to know what part it is.
Click to expand...
Click to collapse
well since i have to pay to take it in and out, you can see that it is difficult for me. if it happens to take it out for some reason i will spare you the photos.

Dasaita Head Unit just died ?

Hi everyone,
I have ordered almost 2 years ago a Dasaita 9" Android 10 Head Unit (4G 64G Octa Core) for my 2009 Forester. Until yesterday the device worked fine, I really loved and enjoyed it, I was really impressed with it. The only thing I change I was the launcher and mainly used it for Google Maps, Spotify and Torque Pro.
Yesterday on my way to my mate’s, 50km on the way, the head unit just stopped working, I was just using google maps and listening some tunes on Spotify. (note: the screen was hot to the touch).
Since then the screen is totally black and the only thing that lights up when I turn on the lights are the side buttons. I tried to reset, the lights are flashing then nothing. No matter what the screen remains dead. Also I noticed my OBD2 adapter doesn’t connect automatically to the HU as it used to and I can’t connect by Bluetooth with my phone neither.
All this brings me to think that the HU is dead ????
I saw few videos and threads online with people having more or less the same issue… anyone got a solution or faced the same problem ?
Thank you for the help

What steps have been taken to investigate

MrPoopyButtOle said:
Hi everyone,
I have ordered almost 2 years ago a Dasaita 9" Android 10 Head Unit (4G 64G Octa Core) for my 2009 Forester. Until yesterday the device worked fine, I really loved and enjoyed it, I was really impressed with it. The only thing I change I was the launcher and mainly used it for Google Maps, Spotify and Torque Pro.
Yesterday on my way to my mate’s, 50km on the way, the head unit just stopped working, I was just using google maps and listening some tunes on Spotify. (note: the screen was hot to the touch).
Since then the screen is totally black and the only thing that lights up when I turn on the lights are the side buttons. I tried to reset, the lights are flashing then nothing. No matter what the screen remains dead. Also I noticed my OBD2 adapter doesn’t connect automatically to the HU as it used to and I can’t connect by Bluetooth with my phone neither.
All this brings me to think that the HU is dead ????
I saw few videos and threads online with people having more or less the same issue… anyone got a solution or faced the same problem ?
Thank you for the help
Click to expand...
Click to collapse
I'd pull the unit and check you didn't just lose you 12v or ground cable.

gottahavit said:
I'd pull the unit and check you didn't just lose you 12v or ground cable.
Click to expand...
Click to collapse
Thank you for your answers.
So I have pulled the unit out and checked with the multimeter, I’ve got a good ground and I read 12V (from the harness adapter). These seems fine right ?!

I assume you've tried the reset button?
Does the Daisata have a detachable screen? On my joying I'd check the ribbon cable.
Next I'd attach the 12v and ground to an external source(got a battery charger around?)
If that all fails then I guess try to talk to the Seller.

gottahavit said:
I assume you've tried the reset button?
Does the Daisata have a detachable screen? On my joying I'd check the ribbon cable.
Next I'd attach the 12v and ground to an external source(got a battery charger around?)
If that all fails then I guess try to talk to the Seller.
Click to expand...
Click to collapse
The screen isn’t detachable.
I got in touch with the seller and that’s his reply:
“1. Do you try to power off the device to check?
2. If you have power off and it still doesn\'t help. Please remove the power cable and then wait 3 minutes to plug it again.
3. After plug the power cable, wait 3 minutes, and then click the touch screen button to check whether you can hear the sound.
4. If you can hear the sound, you can check the 2 bands in the following:
https://image.pushauction.com/0/0/dce5012a-1758-4291-8a6d-52d646eb6789/d770b77d-524c-47b5-8e88-6454abf03318.jpg
Here is the video for you to check how to unplug one band:
you can follow it to check another bands.
5. If the step 4 don't help, you can check the unplug the core chip, and then plug it aigan:
6. If the step 5 don\'t help, please use the pin to press the RST after you reconnect the power cable. You should press the RST hole until you saw the button light is flashing
to check whether you can see the image now.”
I’ve followed the steps 1 to 3 and nothing happened, no sounds.
just got back from work and I’m gonna give a shot to no4, unplug the chip…

I would press the reset pin as the first step, but as long as they are helping you through it.

If the unit has HDMI output, I would suggest hooking up an external monitor. If you see a valid image on the external monitor, then most likely the problem is the LCD display in the head unit. If nothing is displayed on the external then it's likely the core board or some part of the mainboard which may have overheated. These units have many weak points that can render them useless.
I will share with you that I had this exact same unit as yours and the TFT board (it's the board that interfaces the LCD display to the mainboard) had a component burn up which left the screen dark. Dasaita provided a new TFT board which got the display working again. If you do manage to get the unit going again, never run the display brightness at 100% or you risk having the TFT board problem.

Requested moderator to move this thread to MTCD Android Head Units General.

jlbooth said:
If the unit has HDMI output, I would suggest hooking up an external monitor. If you see a valid image on the external monitor, then most likely the problem is the LCD display in the head unit. If nothing is displayed on the external then it's likely the core board or some part of the mainboard which may have overheated. These units have many weak points that can render them useless.
I will share with you that I had this exact same unit as yours and the TFT board (it's the board that interfaces the LCD display to the mainboard) had a component burn up which left the screen dark. Dasaita provided a new TFT board which got the display working again. If you do manage to get the unit going again, never run the display brightness at 100% or you risk having the TFT board problem.
Click to expand...
Click to collapse
There isn’t a HDMI output, is there another way I could hook it up to a monitor ???
It’s interesting what you’re saying about the brightness, I often had it on max during the day and my partner who had the car on the day the unit died told me that she had the car heaters on ( it’s cold in the part of Australia where we at) and noticed that just before dying the screen brightness went dim.
it’s really confusing right now as I can’t figure out what exactly is the problem.
I tried everything the seller suggested and nothing worked. How long did your unit last ? I’m just wondering if I should just get a new one but it is annoying as I only had it for 2 years and I got the top of the range (at the time) from them.
Thank you

Only other option I can think of is that there may be composite video out connections via RCA connections if it has those. Since you say it does not connect to your phone via Bluetooth, that suggests the unit is not booting up when power removed and reconnected. I would venture a guess that the coreboard has an issue especially if the problem was caused by a thermal issue. But that's only an inconclusive guess on my part.
Even when the screen was an issue the unit would boot up and it connected with my phone.
My unit lasted about 5 months before the screen problem. However it was in my second vehicle and it wasn't my daily driver, thus it probably wouldn't have lasted that long if it was being used everyday. Fortunately in my case Dasaita provided the needed replacement board at no charge under warranty.

MrPoopyButtOle said:
The screen isn’t detachable.
I got in touch with the seller and that’s his reply:
“1. Do you try to power off the device to check?
2. If you have power off and it still doesn\'t help. Please remove the power cable and then wait 3 minutes to plug it again.
3. After plug the power cable, wait 3 minutes, and then click the touch screen button to check whether you can hear the sound.
4. If you can hear the sound, you can check the 2 bands in the following:
https://image.pushauction.com/0/0/dce5012a-1758-4291-8a6d-52d646eb6789/d770b77d-524c-47b5-8e88-6454abf03318.jpg
Here is the video for you to check how to unplug one band:
you can follow it to check another bands.
5. If the step 4 don't help, you can check the unplug the core chip, and then plug it aigan:
6. If the step 5 don\'t help, please use the pin to press the RST after you reconnect the power cable. You should press the RST hole until you saw the button light is flashing
to check whether you can see the image now.”
I’ve followed the steps 1 to 3 and nothing happened, no sounds.
just got back from work and I’m gonna give a shot to no4, unplug the chip…
Click to expand...
Click to collapse
From my teardowns of my MAX10 unit (Toyota Universal + PX6 + Car Play), you have a little driver board behind the screen. It isn't the same as the picture you sent as mine is a universal type unit. On yours all the buttons are off the big pcb board and the driver board is soldered onto that (so not physically removable without some soldering). But if the buttons light up then your unit is turning on somewhat. So what I can see from step 4: #2 is the ribbon connecting the screen driver board to the mainboard; #3 is ribbon connector for the lcd display panel, #1 is your CPU board. There's a photo translator app on google play if you want to give that a try with the labels in Chinese.
Best of luck with this mate. The HDMI out is a mini HDMI connector on the CPU board - see if you can get that to display something on a spare screen (on later units they just have a cable to that directly and they sell it off as having hdmi out). If it doesn't output anything then your CPU is potentially dead at this point. There is an STM32 microcontroller (i.e. the MCU) on the amp board and that can be powering up the button lights.

That "driver board" that @nxdesign refers to is the TFT board that Dasaita provided a replacement when my unit died. I could tell that my particular unit was at least booting up as I could see that it was pairing with bluetooth on my phone. I tend to believe OP's problem is either CPU or MCU failure - perhaps thermal related. These units don't provide adequate cooling.

You're welcome to send it to me in NZ, I often get SOMs sent to me for repair and would be happy to look at your unit. Failing that, suggest warranty.

nxdesign said:
From my teardowns of my MAX10 unit (Toyota Universal + PX6 + Car Play), you have a little driver board behind the screen. It isn't the same as the picture you sent as mine is a universal type unit. On yours all the buttons are off the big pcb board and the driver board is soldered onto that (so not physically removable without some soldering). But if the buttons light up then your unit is turning on somewhat. So what I can see from step 4: #2 is the ribbon connecting the screen driver board to the mainboard; #3 is ribbon connector for the lcd display panel, #1 is your CPU board. There's a photo translator app on google play if you want to give that a try with the labels in Chinese.
Best of luck with this mate. The HDMI out is a mini HDMI connector on the CPU board - see if you can get that to display something on a spare screen (on later units they just have a cable to that directly and they sell it off as having hdmi out). If it doesn't output anything then your CPU is potentially dead at this point. There is an STM32 microcontroller (i.e. the MCU) on the amp board and that can be powering up the button lights.
Click to expand...
Click to collapse
Thank you for your help mate !
I couldn’t find this hdmi connector on the board. The seller is telling me it’s probably the core board and said the shipping cost isn’t worth it to send it back to them. Is there a different way to check the display ???

MrPoopyButtOle said:
Thank you for your help mate !
I couldn’t find this hdmi connector on the board. The seller is telling me it’s probably the core board and said the shipping cost isn’t worth it to send it back to them. Is there a different way to check the display ???
Click to expand...
Click to collapse
A dead coreboard will mean you have a shell of a unit. Can they sell you a fresh coreboard? Or even better give you a new unit at a discount? Who knows what else might have been damaged with the heat.

Just an update on this. The unit was sent to me and received today.
The root cause was that the SOM was non-booting. Recovering the SOM via MASKROM has restored the unit.
The SOM has no additional heatsink or cooling, and this may have been a contributing factor.

can u tell me how do u fix it?? i also have same problem....?

Nothing worked after I did everything the merchant suggested. What was the lifespan of your unit? I'm wondering if I should just get a new one, but it's a pain because I just had it for two years and it was the top of the line (at the time).

Dasaita PX6 died

I have a Dasaita PX6 1024x600 headunit that's a little over 3 years old. It came with Android 9 and I upgraded it to Android 10 over a year ago and its been working fine up till yesterday. Yesterday I started my car and it began to boot, then abruptly turned off. It never finished booting because my phone never connected. Since then, the only response I can get from the head unit is the lights blink 3 times when I hold reset. I tried holding it longer, I tried giving it a quick press or two after the 3 blinks, but nothing happens. Nothing shows up on the display and my laptop doesn't see any USB device connected either if I try to connect it. The display backlight doesn't even come on. I tried pulling the fuse and reseatting the SOM but haven't had any luck getting this thing to work. All the wiring is fine and I'm getting 12V on B+ and also Ignition/ACC when the car is running.
Any idea how I can revive this thing or is it dead for good?

No surprise that it died after 3 years. They design them to last just past the warranty period (if lucky).
Anyway, the fact that the lights blink, "suggests" the MCU board is working at least a little bit. Would be helpful to know if the problem is SOM related or MCU related. Since we know the MCU is doing something when powered on, I would recommend maybe research some of the SOM recovery threads in the MTCD hardware forum. There is at least one thread detailing connecting the SOM to a PC with it removed from the head unit. The thread(s) you are looking for are regarding USB OTG recovery. At a minimum, you can find out if the SOM board is totally dead or just in a coma.
Maybe you can figure out if there's "signs of life" in the SOM board, that way. There are a few users here in the forums that have had success at recovering dead SOM boards.
Best of luck to you.

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forum.xda-developers.com

Thanks! I think I can safely say this thing is beyond recovery. I created the USB cable and made sure to measure the voltage, which is a perfect 5v and 3.3v using those resistors as specified. I connected it keeping in mind to move everything 2 pins over since in the pictures their PX5 was missing the first 4 pins. Nothing happens when I connect to the laptop, using usblogview i can see it doesnt even detect any device being connected. I tried shorting the two pads next to the chip to force it into MASKROM mode but no luck. Seems to be totally dead. I verified all the connections and tested with a multimeter to make sure everything was making good contact. Sucks I couldn't revive it but at least I can say I tried!