Develop Bugs

Wanted: bricked universal

Hi all,
I have a Universal on which the screen stopped working. I actually think the screen itself is fine, but that the connecting cable(s?) is damaged.
Using MyMobiler I can "see" the Universal's display on my laptop, so I know the rest of it is fine.
As a result, I'm looking for a dead Universal (with a working screen!) that's now unwanted so I can repair mine. Alternatively, if anybody can reccommend a CHEAP but GOOD repair service in the UK.
Many thanks in advance!

Hi, just PM'ed you, if you r interested

Having partially opened the thing, I can see the coaxial cable is damaged and this is the only part I need replacing.
If anybody has a totally dead Universal, even with a smashed screen I'd be very interested!

Carphone warehouse....
NanoRuler said:
Having partially opened the thing, I can see the coaxial cable is damaged and this is the only part I need replacing.
If anybody has a totally dead Universal, even with a smashed screen I'd be very interested!
Click to expand...
Click to collapse
Why not take it to the Carphone warehouse I took mine there when the screen was damaged and it only cost me £35 to repair... Alternatively buy a new coaxial cable off ebay should be able to find loads from Hong Kong etc.

Flex Cable change gives errors PLEASE HELP

Hi dear developers!
I got a Touch Pro 2 from a friend, it's a GSM device he bought in Germany (O2). I changed a few parts but messed the main flex cable. The part from the power button is not connected anymore, a clean cut through, no repairs possible as far i think. So i bought a new one over ebay from Hong Kong. The seller told me it's for a GSM device BUT the cables do not look the same. The production date is 2008 and the damaged one was produced 2009. I built everything together and now the big surprise:
Phone boots normally but when the Home screen appears, it is always in landscape mode. No matter if the phone is closed or the keyboard open. I can only change the screen over advanced tools, but after soft reset again only landscape mode. The buttons for calling also do not work (those two down on the screen when you want to call someone or end a call ---> no reaction).
A hard reset and new ROM (energy) didn't change anything. By the way, the keyboard only fires up after pressing a button. Before it automatically lightened up after sliding.
What the hell is wrong now, did the send me a CDMA cable? Where is the difference ? Please help me i do not want to spent another 30 bucks again for a proper flex cable.
Edit: I disassembled the phone again and took a closer look on the flex cable: the lower part (with the LCD connection etc) looks quite same except for 3 or 4 transistors and their position on the PCB. The upper part with the earpice looks way different. The positioning of the single parts is not the same. But how can that interfere ? Guess there is no problem with the mainboard or the LCD (which is brand new).
Here are some pictures
h**p//img28.imageshack.us/img28/1514/image2sh
h**p://img849.imageshack.us/img849/8167/img1609m.jpg

OK, i solved the problem. The guy who sold the flex cable sent me a older one as I described. This thing was fully responsible for the errors. Bought a new one and everything works fine now^^ So if you ever want to change your Flex cable take good care which one you buy (especially on ebay!)
Btw: The display and the digitizer are glued and IF you want to replace any of those two, do yourself the favor and buy the complete bundle !!! I made the mistake and tried to replace the digitizer and cracked the display. There is no way as far as I can say, that you can manage this.
Bye

Can u post the seller info? Im in the same situation w a different phone... Thanks

problems with 1 year old ZenFone2 4gb

Hi everyone, I bought this ZenFone2 4gb 64g, recently it got soaked in my pocket due to rain and now has a few problems such as vibrating motor not working, microphone and speakers not working and screen timeout not working as well.
the problem is that due to job I relocated to Pakistan and here there is no one with replacement parts for this phone neither do they have experience of it. I have located parts on aliexpress.com but I am reluctant to open it up myself.
ASUS says Thayer its warranty was only 6 months so I am left with no options. Help me guys if you know something which can be done.
Thanks

Its easy to open. Need just the right tools. I think you may need to change docking port chip. Its about 6$ at aliexpress. Changed mine.. There are a lots of guides in web. Try one.
If you don't want to change it, just order it and go to some Asus repair center or any cellphone, smartphone repair center. And tell them you're problem firstly. Anyone with normal knowledge about a smartphone could do this.
Ofcourse if you do it yourself there can be problems, that i had : Broken antenna cable (I changed display- twice), broke the battery (i was a fool ).
Little Instruction: Take back cover off, take all the screws out, they are about 10, don't remeber really. Unplug SIM, SD flex cable, that is on the docking port chip.
Remove Antenna, very carefully. And replace it.

Zenfone 2 disassembly video:
http://www.youtube.com/watch?v=qMIivqu6XJY

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).