Develop Bugs

[Q] ASUS Microphone and Other Replacement Parts

The microphone on my Nexus 7 LTE 2013 edition doesn't work at all, so I've been attempting to find the replacement part.
Working with ASUS support to get this information has been a frustrating challenge. It seems their support reps are fond of telling you what they can't do instead of actually helping customers.
Does anyone know how to get information on replacement parts for the Nexus 7 2013 edition?
I found this site:
http://www.asusparts.eu/en/partfinder/Asus/Pad/Nexus/ME571KL (Nexus 7)
But the description of many of the parts isn't too helpful. The support reps for that site (Zand Parts) didn't know which part I would need to replace to fix the microphone.

Go to some local store that has an in house repair dept and sells the n7 and start asking a repair tech how they get parts and if they will order parts for you. Some examples would be micro center/best buy/etc.

dkryder said:
Go to some local store that has an in house repair dept and sells the n7 and start asking a repair tech how they get parts and if they will order parts for you. Some examples would be micro center/best buy/etc.
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Click to collapse
Thanks. I've been talking to the manager of a local shop, and he said he'd need to take the device apart to see which part is the correct replacement. I just followed up with him via email to see if he'd tell me who his parts suppliers are.
I also talked to ASUS technical support again, and he didn't seem to know whether the microphone is separately replaceable. He said the microphone is attached to the main board, and that my not be possible to detach it and replace it with a separate part.
Either way, I think it would be helpful if people in this Nexus 7 2013 forum could establish a base of tips and knowledge on how to get parts and repairs and deal with Asus. I'll share what I find out, which, so far, has been very little.

A quick update on my quest to get information on replacing the microphone.
I've talked to two Asus technical support reps and gotten different answers.
The first rep told me the microphone is attached to the main board and cannot be replaced separately. He claimed I had to replace the entire main board, which would cost over $200.
The second rep, Emma Zhang, estimated the cost of the microphone to be $10, implying that it's possible to replace it independently of the main board. She refused to divulge the part number or any other specifics about the part. When I informed her that another rep said the microphone wasn't independently replaceable, she said I would have to send in my device.
I've replied to Emma, letting her know that I find her claim perplexing and unacceptable that Asus can't definitely tell me whether the part is replaceable independently of the main board.
Meanwhile, my latest emails to the local mobile repair shop have gone unanswered.

There is a nexus 7 dissambling video on youtube, just watch it to see if its replaceable or not, simple. Don't email for such a subject, go and talk to them, they need to get annoyed from you to help you.

Dakura said:
There is a nexus 7 dissambling video on youtube, just watch it to see if its replaceable or not, simple. Don't email for such a subject, go and talk to them, they need to get annoyed from you to help you.
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Click to collapse
Yeah, I've also talked to them over the phone, with the same results.
I've seen a few Nexus 7 disassembly guides, but not one that answered the question about whether the microphone is replaceable independently of the main board, much less what the part number would be.

Okay, after over a month of evasion from Asus, I finally spoke with a representative who was both knowledgeable and straightforward about replacing the microphone on a Nexus 7 2013 edition. Here's the scoop:
There is an audio input component replaceable independently of the motherboard.
In some cases, it is necessary to replace the entire motherboard to fix problems with audio input.
Even in some cases where it's sufficient to replace just the audio input component, the engineers may choose to replace the entire motherboard anyway.
I didn't ask what the part name or description is for the audio input component.

SOLUTION - Microphone replacement - Nexus 7 (2013)
rcauvin said:
Okay, after over a month of evasion from Asus, I finally spoke with a representative who was both knowledgeable and straightforward about replacing the microphone on a Nexus 7 2013 edition. Here's the scoop:
There is an audio input component replaceable independently of the motherboard.
In some cases, it is necessary to replace the entire motherboard to fix problems with audio input.
Even in some cases where it's sufficient to replace just the audio input component, the engineers may choose to replace the entire motherboard anyway.
I didn't ask what the part name or description is for the audio input component.
Click to expand...
Click to collapse
For anyone seeking to merely replace the mic, this (old) thread is a bit misleading.
The procedure is VERY simple (and obvious once the device is opened by removing the back). The tiny mic is an integral part of the power/volume cable assembly which is relatively cheap and readily available, including from the ASUS part source previously mentioned (look under "cable").
Unfortunately, the proper part - the full cable assembly- does not generally become apparent when searching solely for "microphone."

MTCD KLD fixing bad WiFi

I only found similar information for another device here. So I decided to share my experience with you.
I got myself an MTCD device which is obviously manufactured by Klyde (MCU code: KLD).
Today I tried to work on the software and found the device to display good reception in terms of WiFi indicator bars and 72Mbps downstream speed. The access point was quite close too. However despite the claimed reception opening web-pages was almost impossible and often ended in timeouts.
For me it was clear the bad "antenna" (which is basically just a cable visible at the back of the device) is the cause for this.
So I decided to change this.
After opening the device I could see that there is an internal "antenna" and a second antenna which is the one visible at the back.
I know the device only has 2.4GHz WiFi so I just cracked up an old USR WLAN router I was not using any more. This router got 2 replaceable antennas and luckily the antenna ports were not soldered to the board but connected using cables.
Therefore I could simply screw the jacks from the WLAN router to the DTV holes (unused on my device) on the back and solder the cables to the board.
Here are some pictures:
After this "surgery" the radio still fits properly to my car. You might have to be careful using antennas which do not stand off too wide at the back of the unit.
The result was a dramatically increased wireless quality. In fact it does not show more signal strength bars than before and also still sticks to 72Mbps but web pages now open immediately, downloads from play store are quick as expected.
Given the fact those antennas are cheap (less than $1 on ebay) I can't really understand why this is not offered stock.

Cool, KLD MTCD units use an RTL8723bu (you can see it near where the 2 antennas are soldered) its a combined BT/WiFi chip so you may get better BT reception too.

typos1 said:
KLD MTCD units use an RTL8723bu ... its a combined BT/WiFi chip so you may get better BT reception too.
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Click to collapse
Thanks for the reply. I didn't even check this but looks like you're totally right. I didn't have bluetooth connectivity issues before though. However I didn't use it much yet.
Thank you.

@SkyBeam2048
may I get the information which CPU your unit is working with?
I got a 7.1" unit manufactured by Klyde with an 8-core Cortex-A53 at 1.4GHz.
Unfortunately this unit works with Android 5.1.1 instead of 6.x and I am looking for an update.
Does your unit have something like a deep sleep mode, so that there is no cold boot after a short break?
By the way... I am talking about this unit...

rigattoni said:
@SkyBeam2048
may I get the information which CPU your unit is working with?
I got a 7.1" unit manufactured by Klyde with an 8-core Cortex-A53 at 1.4GHz.
Unfortunately this unit works with Android 5.1.1 instead of 6.x and I am looking for an update.
Does your unit have something like a deep sleep mode, so that there is no cold boot after a short break?
By the way... I am talking about this unit...
Click to expand...
Click to collapse
Please post a pic of your settings/about device screen so we know what unit you have ?

rigattoni said:
may I get the information which CPU your unit is working with?
I got a 7.1" unit manufactured by Klyde with an 8-core Cortex-A53 at 1.4GHz.
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Click to collapse
My one is a PX5 device (8 core 64-bit [email protected] and 2GB memory.
However without having more information on your device nobody will be able to tell you if you got a PX5 or some custom design.
As asked here you might post the system about screen to get more information on the device you have.
The thread here was mainly opened to discuss about changing antenna on my device. Perhaps it would by worth for you to open your own thread for your issue and how to upgrade (if possible).

SkyBeam2048 said:
My one is a PX5 device (8 core 64-bit [email protected] and 2GB memory.
However without having more information on your device nobody will be able to tell you if you got a PX5 or some custom design.
As asked here you might post the system about screen to get more information on the device you have.
The thread here was mainly opened to discuss about changing antenna on my device. Perhaps it would by worth for you to open your own thread for your issue and how to upgrade (if possible).
Click to expand...
Click to collapse
Indeed, the "1.4Ghz" bit is strange - it should be 1.6 (RK3188/PX3), 1.5 (RK3368/PX5) or "1.2" (Intel Sofia), not 1.4Ghz.
If its not a typo then it could be an Ownice octacore unit one of which I saw recently with an MCU prefixed by "KLD" suggesting that theyre made by KLD (which was news to me as I thought Ownice was a manufacturer in their own right), unless it was coincidently a random string of letters.
When he posts a screenshot we ll know . . .

Yeah, sorry for capturing your Wifi thread...
This is the unit which has been sent.
But to show you what I have:

rigattoni said:
Yeah, sorry for capturing your Wifi thread...
This is the unit which has been sent.
But to show you what I have:
Click to expand...
Click to collapse
Thats the picture I was talking about that I saw the other day - its not and MTCB/C unit or an MTCD unit.
@ikerg said it was an Ownice unit, AFAIK Ownice was a manufacturer in its own right, so I was either wrong or, as I said, maybe its just coincidence and the "KLD" is not related to the manufacturer Klyde who make MTCB/C/D units.
So I d advise checking the Ownice threads in the Android Headunit General forum.

typos1 said:
Thats the picture I was talking about that I saw the other day - its not and MTCB/C unit or an MTCD unit.
@ikerg said it was an Ownice unit, AFAIK Ownice was a manufacturer in its own right, so I was either wrong or, as I said, maybe its just coincidence and the "KLD" is not related to the manufacturer Klyde who make MTCB/C/D units.
So I d advise checking the Ownice threads in the Android Headunit General forum.
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Click to collapse
No it seems not to be an Ownice unit. Front and back are completely different to mine. Mine is exactly as shown at Klyde. The reset hole is not on top right as in Ownice units, instead it is positioned just on top of the SD-Card slot.
But thanks a lot and sorry again for capturing.

rigattoni said:
No it seems not to be an Ownice unit. Front and back are completely different to mine. Mine is exactly as shown at Klyde. The reset hole is not on top right as in Ownice units, instead it is positioned just on top of the SD-Card slot.
But thanks a lot and sorry again for capturing.
Click to expand...
Click to collapse
I wouldnt go by the reset hole, that can be anywhere.
It was @ikerg that said it was Ownice, he seemed quite certain.
Its deffo not MTC at all, or it would say "MTC" in the MCU field, I m a bit stumped, I normally refer people to the Android Headunits General forums for non MTC units, not sure what to say about yours, a I said I cant say whether the "KLD" means its Klyde or whether its just coincidence.
Maybe try contacting Klyde and asking if its one of their units ? Theyre here :
http://www.szklyde.com/universal-android-car-dvd/

Joying VQ125 - Defective touchscreen

Hello,
at first - I wanted to post this in the MTCB Hardware Development section, but because of my low post count I wasn't able to - sorry for that.
I own a Joying JY-VQ125 head unit which I bought about one and a half year ago. Unfortunately a few days ago the upper third of the touchscreen stopped working. I did a factory reset and flashed the original Joying 4.4.4 firmware again to get sure that it isn't a software fault.
Because of the Joying-"2 year warranty" I contacted their support. Summarized there are two options:
Change the front board of the headunit. I have to pay $75, they send me the new front board, after changing it I have to return the old front board (shipping costs of about $30) and as soon as they receive the old one I'll get back $50 deposit I payed at the beginning.
Get 10% discount off a new headunit like the JY-VM130N2.
I'm not really happy with this two options.
With the first option I'll pay about $55, but actually it's a out-of-date head unit and I don't know if it's worth.
With the second option I have to pay a whole head unit (10% discount aren't a really good deal) and dispose my current one. The only benefit would be that I then have a up-to-date head unit. But what if the touchscreen also breaks down after a few months and there is again a new generation of head units - do the same thing again?!
So what do you think I should do?
Is there a possibilty to upgrade the motherboard (CPU, RAM,...) of my current head unit? Then I would take the first option and ask them to also send me a new motherboard..
Every advice is welcomed.

Purchasing - Looking for advice on avoiding scams

Hi,
As per title, I have decided I want one of these HUs with the RK3399 and the MTCD/E MCU. I plan to flash with a custom ROM as soon as I have tested it and before installation.
History: had a Joying 10 inch a few years ago, hated it, want to do it right this time!
The vehicle (in my case) is a 2009 Toyota Prado 120 (similar to the Lexus GX470) RHD, The units I am looking at are full ctr console replacements with fascia and vertical screens.
After wading through the seemingly endless mire of Aliexpress listings and producing a shortlist, I am still a little overwhelmed and confused; prices and specs seem to be all over the place and in many places are contradictory. I'm an eBay kid, I have hardly used Ali before.
Of course, once I shorten my list a little bit more, I will get in contact with each seller to verify hardware specs and make sure I'm getting excatly what I am paying for.
So to help me (and maybe others having a read!) I have a few questions to help me filter out the 'too good to be trues' and the outright liars.
1. Hardware - does the fact that the unit has a RK3399 mean it is definitely a MTCD/E MCU?
2. Hardware(again) - does the fact that they state PX6 necessarily mean its a 3399?
3. Resolution - I have seen all manner of resolutions stated here... the most common seems to be 1024*760/600 but there are a fair few listings saying 1920*1080... which definitely piqued my interest. Is this an outright lie or is it possible that they really do have 1920*1080 displays? (my guess is they're listing it as a "yes it can display 1920*1080 content" and not necessarily actual screen res.)
I would love a true 1080 display but it's potentially too good to be true!
4. Screens - What specifically (if anything) should I look out for/ask about in relation to the screen? model number? some say IPS, some don't.... Are they all the same? (they certainly look pretty similar!)
5. AliEx stores - If anyone has any honest stores they would like to suggest I'm all ears(eyes?) Or even other outlets to buy these things? (eBay doesn't have much listed for my car) The stores I am shortlisting are ones that have decent ratings (obviously) and have been established for more than a year.
6. Anything else? tricks for new players?
Bear with me - its a solid chunk of cash and a decision I will have to live with for some years!
Yes it's my first post - have used the forum over the years for all sorts of information, hopefully I can give some back!

I'll have a go at answering some of your questions, but I'm fair new to this whole Android head unit game so if I'm wrong someone will hopefully correct me.
What was is it specifically about the Joying unit that you hated that you hope will be addressed by a new unit?
Virt1080 said:
1. Hardware - does the fact that the unit has a RK3399 mean it is definitely a MTCD/E MCU?
2. Hardware(again) - does the fact that they state PX6 necessarily mean its a 3399?
3. Resolution - I have seen all manner of resolutions stated here... the most common seems to be 1024*760/600 but there are a fair few listings saying 1920*1080... which definitely piqued my interest. Is this an outright lie or is it possible that they really do have 1920*1080 displays? (my guess is they're listing it as a "yes it can display 1920*1080 content" and not necessarily actual screen res.)
I would love a true 1080 display but it's potentially too good to be true!
4. Screens - What specifically (if anything) should I look out for/ask about in relation to the screen? model number? some say IPS, some don't.... Are they all the same? (they certainly look pretty similar!)
5. AliEx stores - If anyone has any honest stores they would like to suggest I'm all ears(eyes?) Or even other outlets to buy these things? (eBay doesn't have much listed for my car) The stores I am shortlisting are ones that have decent ratings (obviously) and have been established for more than a year.
6. Anything else? tricks for new players?
Bear with me - its a solid chunk of cash and a decision I will have to live with for some years!
Yes it's my first post - have used the forum over the years for all sorts of information, hopefully I can give some back!
Click to expand...
Click to collapse
1) MTCD/E are MCU's manufactured by Microntek, but there are other manufacturers of MCUs out there than can be paired with the PX6, so there is no guarantee that a RK3399 means that the unit is fitted with an MTCD/E MCU
2) My understanding is that the RK3399 is a generic SoC, PX6 is a verson of the RK3399 specifically tailored for use in head units.
3) I don't know, but I would be wary of anyone claiming 1920 x 1080
4) Not sure
5) I bought a unit from Dasaita on AliExpress. It definately wasn't straightforward (first unit was sent to some other destination, they had to send me a replacement via DHL). But they did at least try to get things sorted ina timely manner. I chose Dasaita (aka hot-audio) mainly because they do post here on XDA. They are also on eBay, but the prices on Ali are better.
6) The aftermarket service from Dasaita leaves something to be desired, but from what I can see, none of them are very good at this. But I guess that's the price you pay for buying a cheap head unit. Overall, I'm very happy with my Dasaita PX6 unit, but i've only had it installed for a month, so early days.
Anyway, I hope that this is of some help to you, and good luck with your search!

jrobbom5 said:
I'll have a go at answering some of your questions, but I'm fair new to this whole Android head unit game so if I'm wrong someone will hopefully correct me.
What was is it specifically about the Joying unit that you hated that you hope will be addressed by a new unit?
Click to expand...
Click to collapse
Hey thanks for the reply!
The Joying unit was likely my own fault for not doing enough research prior to purchase, paid too much for too little I guess.
It worked well for a while but progressively got slower until it was nearly unusable for anything more than a clock and radio, this was quite a few years ago though and I had not found any alternative firmware at the time, I eventually just formatted it for some minor improvement and sold the car anyway.
With this new unit I will be running hal9k from the start instead of the default firmware and am expecting fairly smooth operation. It will be used for offline raster maps while I am out in the bush
Thanks for the information regarding the hardware, I still had a few grey areas in my mind there so that helps clear a bit up.
I wanted to use Dasaita as they seemed to be recommended but they do not sell to suit my model.
I will start making some enquiries today and see if I can get any clarification on those 1920 displays.
Cheers!

I hope this is the right forum.

I apologize if not. I'm desperate for assistance and I hope someone can point me in the right direction. I recently purchased a Dasaita Vivid 10 on Amazon for my 2015 Camry. Few things:
After installation and turning it on, I wasn't presented with the first time user setup. Additionally, there were a few local MP3s on there. Specifically "Hotel California" from The Eagles. Is this normal or was I sold a used unit? The unit itself had the plastic on the screen. ZERO marks that it was used. Everything from my perception was brand new.
However, when I went to connect WiFi, I received the seemingly common error of it turning on and instantly back off again. As such, I did a factory reset. This erased all of the music that was on the device. This leads me to think that it shouldn't come with music...
Each time I turn my car on, the WiFi is a red X on the icon on the bottom right. To resolve this, I need to hctreboot the thing using factory settings. After this, it will work. However this really sucks and I don't want to do this every time I get into my car. Last night I changed the BT setting and I believe it may have fixed the wifi issue. However, this broke Bluetooth. When I loaded up a hardware info application, there was a mac address for WiFi but none for BT. Is there a way to know which module I have to select the right setting?
Can someone explain exactly what I can do to fix this? After searching for hours I am so lost with all of the terms. Vivid, Scout, MAX. I have no idea where to even get a firmware file. What does MTCD stand for? While it may be considered a budget radio, $530 bucks is a big chunk of change for a radio to be this unreliable. I wrote on Dasaita's forums and it looks like they couldn't care less to assist people. Frustrated, and I'd like help here before returning this and returning to the stock unit. I can provide pictures of anything if needed, just let me know!
Thank you all!

Welcome to the world of cheap Chinese origin Android head units and quality issues.
There is no first run, that is normal.
MTCD refers to a type of unit based on HCT design. There are a bunch of factories that produce these and a bunch of resellers, such as dasaita that sell them, applying made up brand names and model codes. Dasaita appear to price their units at a premium.
Suggest returning it for the hardware issue and look to an FYT based unit, which might get you closer to what you want.
I no longer recommend MTCD based units, and have since brought an FYT 7862UIS based device. The bugs are less, superior hardware, fantastic audio and works without all the mods/hacks.

marchnz said:
Welcome to the world of cheap Chinese origin Android head units and quality issues.
There is no first run, that is normal.
MTCD refers to a type of unit based on HCT design. There are a bunch of factories that produce these and a bunch of resellers, such as dasaita that sell them, applying made up brand names and model codes. Dasaita appear to price their units at a premium.
Suggest returning it for the hardware issue and look to an FYT based unit, which might get you closer to what you want.
I no longer recommend MTCD based units, and have since brought an FYT 7862UIS based device. The bugs are less, superior hardware, fantastic audio and works without all the mods/hacks.
Click to expand...
Click to collapse
Aww man, not the news I wanted to hear however it was expected. At this point I might just go back to stock. I really loved how the dasaita fit into my Camry as it looks super OEM and clean.
Do you know of any of the FYT units that look OEM for a 2015 Camry?

Is this FYT: https://www.joyingauto.com/joying-1...radio-replacement-2015-2017-android-auto.html

I have a 2017 Camry and have this head unit:
https://www.amazon.com/SYGAV-Android-Toyota-Carplay-Navigation/dp/B08PKZY28H/ref=sr_1_1
While it's not a FYT unit, I will tell you that it does not have Vivid installed on it and has worked quite well in my Camry for over a year now.
Would be happy to answer any questions about it. I posted a review on Amazon and have answered a few questions over on Amazon as well.

jlbooth said:
I have a 2017 Camry and have this head unit:
https://www.amazon.com/SYGAV-Android-Toyota-Carplay-Navigation/dp/B08PKZY28H/ref=sr_1_1
While it's not a FYT unit, I will tell you that it does not have Vivid installed on it and has worked quite well in my Camry for over a year now.
Would be happy to answer any questions about it. I posted a review on Amazon and have answered a few questions over on Amazon as well.
Click to expand...
Click to collapse
Thanks so much for this! If I can't get my Dasaita working correctly, I will absolutely return and get that one!

Check this firmware recently released:
ha3_rk3399_10.0_ota(20220329+蓝牙MCU专用包).zip
Shared with Dropbox
www.dropbox.com