Chinese Head Unit ZXDZ 01 (8227L Android 9) Query

[ExtremeMOD]

I've got same unit with updated firmware. I bought power player pro to get eq control, works perfectly in my Benz. Don't need fader so never bothered.

That might be the case but without that audio chip, the sound quality is beyond horrific. It was already bad in the older units that ran TDA7388 amplifier and already had the chip.

Now you're getting YD7388 amp (that's a crappier version of already crappy TDA7388) and no audio chip.

Not even PowerAmp can help you, I'm afraid. Viper4Android can't do much either.

Luckily, for just a few dollars, you can upgrade to TDA7729 audio processing chip, then add TDA7850 amp powered by a 10,000 uf capacitor and install proper cooling system to support the insane power that TDA7850 produces. Then root your unit and install Viper4Android. Then with proper configuration, the sound quality from your Android will be on par with hi-end Android units, that for example Mercedes sells for £5,000 or more.

Check the video in my signature for more tips.

 

[tankata]

That might be the case but without that audio chip, the sound quality is beyond horrific. It was already bad in the older units that ran TDA7388 amplifier and already had the chip.

Now you're getting YD7388 amp (that's a crappier version of already crappy TDA7388) and no audio chip.

Not even PowerAmp can help you, I'm afraid. Viper4Android can't do much either.

Luckily, for just a few dollars, you can upgrade to TDA7719 audio processing chip, then add TDA7850 amp powered by a 10,000 uf capacitor and install proper cooling system to support the insane power that TDA7850 produces. Then root your unit and install Viper4Android. Then with proper configuration, the sound quality from your Android will be on par with hi-end Android units, that for example Mercedes sells for £5,000 or more.

Check the video in my signature for more tips.

Hi mate, I have head unith like that

can i add to them audio and radio chip? Someone can give me more guedes to do that ?

 

[ExtremeMOD]

Hi mate, I have head unith like that View attachment 5340313View attachment 5340315

can i add to them audio and radio chip? Someone can give me more guedes to do that ?

You can but unfortunately this isn't a (what we would call) a standard model. I thought you had something like this:

 

[tankata]

You can but unfortunately this isn't a (what we would call) a standard model. I thought you had something like this:

Yeah, I know that it is`t standard model. But can`t i add at least one of them?

On the board have empty slot i thought for radio chip, but i am not sure what exactly and what more element need to soldering and wath need change in software (firmware)?

On picture in internet i saw same boards with chip "Techpoint TP2804" in that slot.

 

[mr.willem]

@iceblue1980 I am quite impressed by your work.
Thank you for sharing.

Besides cooling and antennas. When it comes to the ICs.
Do you only change the audio ICs TDA7719 / TDA7850 on those units?
Or do you also change other ICs? Like radio receiver or so?

Is the unit "strong" enough to handle Navigation and maybe even OBDII - Torque with your firmware?
Is it possible to handle two bluetooth connections at the same time?

Thanks a lot
mr.willem

 

[ExtremeMOD]

@iceblue1980 I am quite impressed by your work.
Thank you for sharing.

Besides cooling and antennas. When it comes to the ICs.
Do you only change the audio ICs TDA7719 / TDA7850 on those units?
Or do you also change other ICs? Like radio receiver or so?

Is the unit "strong" enough to handle Navigation and maybe even OBDII - Torque with your firmware?
Is it possible to handle two bluetooth connections at the same time?

Thanks a lot
mr.willem

Appreciate that. Thanks. But to be clear - none of the mods that I do, are my creations. I do a lot of research and then follow the guides that I find. It helps to be a Russian speaker as well, as most of the stuff I learned are from 4PDA forums.

The only thing I can take credit for is the adaptation of the mods, when it comes to the way I make the units look on the outside and the way I configure them.

I've been doing this for about 18 months now as a hobby project to support some charities out there.

To your question - here's the list of what I normally do:

1. Radio: change internal electronics to considerably improve the sound and reception quality of FM

2. Completely rebuild the sound system: installing TDA7850 running at 18v max capacity (DC-DC step-up converter) with 10,000 uf capacitor, supported by a temperature-controlled external fan with its own DC-DC step-down converter (you don't want to use the internal power at all, for anything). In the video in my signature you will also see an additional external heatsink and I also install bronze heatsinks inside the unit to control the heat of the amp.

3. Heatsink on CPU

4. External Wifi antenna

5. Custom internal mic

6. TDA7729 audio chip (if not present, like on YT9213xx models)

7. Custom Android OS with all the bells and whistles.

8. Viper4Android to further improve the sound.

Yes with the modded operating system, this unit can run TPMS, navigation, HD video, and everything else.

Hope this helps

 

[h3llrai53r]

Anyone manage to update, I still get the dead robot

 

[h3llrai53r]

i had this problem, you must disconnect the flash Memory from headUnit and do the update , its will work.

how do you do that boss

 

[mr.willem]

@iceblue1980 Thank you very much for your reply. This is very helpful.

I just ordered one unit and will see whats inside.
Fortunately, I am somewhat experienced with SMD soldering and MCU programming.
What Step UP IC do you use to generate the 18 Volt?
Is it sodered directly on the PCB or do you use an external smps for it?

Do you know whether there are some schematics of the circuit anywhere?
As far as I understand most of the PCBs of those Headunits follow one reference design and are
populated with somewhat more or less quality parts.
I tried to find it but had no luck up to now.

 

[ExtremeMOD]

@iceblue1980 Thank you very much for your reply. This is very helpful.

I just ordered one unit and will see whats inside.
Fortunately, I am somewhat experienced with SMD soldering and MCU programming.
What Step UP IC do you use to generate the 18 Volt?
Is it sodered directly on the PCB or do you use an external smps for it?

Do you know whether there are some schematics of the circuit anywhere?
As far as I understand most of the PCBs of those Headunits follow one reference design and are
populated with somewhat more or less quality parts.
I tried to find it but had no luck up to now.

That is great. Certainly your skills will help you to achieve this and more. As for the schematics - you're absolutely right, they are hard if not impossible to find. I use this step-up module and this step down for the fan control. I use external enclosure for the step-up module, while attaching the step-down one to the motherboard as it fits perfectly below the main socket (see pic)

Perhaps we can collaborate as I still got much to learn, both in electronics and MCU programming. Feel free to PM me and I can share all the resources that are currently available to me.

Also, because I mod and sell these units (for charity), I need to think about how they look on outside as well. There are probably easier ways to mod them if you just do it for yourself.

 

[ofarook]

That might be the case but without that audio chip, the sound quality is beyond horrific. It was already bad in the older units that ran TDA7388 amplifier and already had the chip.

Now you're getting YD7388 amp (that's a crappier version of already crappy TDA7388) and no audio chip.

Not even PowerAmp can help you, I'm afraid. Viper4Android can't do much either.

Luckily, for just a few dollars, you can upgrade to TDA7729 audio processing chip, then add TDA7850 amp powered by a 10,000 uf capacitor and install proper cooling system to support the insane power that TDA7850 produces. Then root your unit and install Viper4Android. Then with proper configuration, the sound quality from your Android will be on par with hi-end Android units, that for example Mercedes sells for £5,000 or more.

Check the video in my signature for more tips.

to be honest i dont know much about ics & stuff, right now all i know is that im amazed by your video, went to my car, removed the hu and opened it. now i dont know where to look for those number. which file should i flash, will leave the ics for later.

 

[ExtremeMOD]

to be honest i dont know much about ics & stuff, right now all i know is that im amazed by your video, went to my car, removed the hu and opened it. now i dont know where to look for those number. which file should i flash, will leave the ics for later.

Thanks! Glad you appreciated it.

You can see in the video that the motherboard is completely different so unfortunately I don't know what to advise you. Sorry

 

[ofarook]

I'll take the risk.

Thanks! Glad you appreciated it.

You can see in the video that the motherboard is completely different so unfortunately I don't know what to advise you. Sorry

ok so the situation is that it did not react to connection to pc, nothing on the pc side as well. so i bought 220 to 12v converrter to power it. even then no difference.. pc wont find hu now hu find pc

 

[ExtremeMOD]

I'll take the risk.

ok so the situation is that it did not react to connection to pc, nothing on the pc side as well. so i bought 220 to 12v converrter to power it. even then no difference.. pc wont find hu now hu find pc

This sounds like a drivers issue. Check out this post where you will find a link to driver installation instructions.

 

[ofarook]

This sounds like a drivers issue. Check out this post where you will find a link to driver installation instructions.

Was trying to connect when 6 pin usb, my mistake . Pc recognized with 4 pin, didn't notice that in your instructions. Now can't get bootloader, unable to find points for hardwire.

 

[GnatGoSplat]

Unfortunately, looks like mine has no place for the audio chip (iMars branded type).
One interesting thing is my LCD was plugged into the smaller of the 2 large connectors on the right in my pic. The bigger one is unused. It looks like other people, the LCD uses the bigger connector. I guess there are 2 types of LCDs commonly used? Are some IPS and others are worse? Mine doesn't have very good viewing angles. Also, what is the connector in the middle of the PCB above the big connector for? Kind of looks like a CFL connector. Mine had nothing plugged into it. I see in other peoples' pics, some have a thicker red & black wire. Others have a white & black wire. Are some of these CFL and others are LED?

I need a fader because my rear speakers are 10x louder than the front without fading, so I guess I'll sell mine. If I get an Android 8/9 version, would it have the sound chip? Do all Android 8/9 models have the sound chip, or is it random?

 

[ExtremeMOD]

Unfortunately, looks like mine has no place for the audio chip (iMars branded type).
One interesting thing is my LCD was plugged into the smaller of the 2 large connectors on the right in my pic. The bigger one is unused. It looks like other people, the LCD uses the bigger connector. I guess there are 2 types of LCDs commonly used? Are some IPS and others are worse? Mine doesn't have very good viewing angles. Also, what is the connector in the middle of the PCB above the big connector for? Kind of looks like a CFL connector. Mine had nothing plugged into it. I see in other peoples' pics, some have a thicker red & black wire. Others have a white & black wire. Are some of these CFL and others are LED?
View attachment 5370649View attachment 5370651

I need a fader because my rear speakers are 10x louder than the front without fading, so I guess I'll sell mine. If I get an Android 8/9 version, would it have the sound chip? Do all Android 8/9 models have the sound chip, or is it random?

Yes it is probably best to get a new unit. Below are the models that have Audio Chip:

YT9216B, YT9217B, YT9128C, YT9216BJ

YT9213AJ and YT9213A normally don't come with the chip.

You can PM me if you want recommendations on what to buy and where (no affiliations on my part) or if you want something really hi-end, then I might be able to help you as part of a charity project I'm currently running. Cheers

 

[t1a2l]

Hey, so i have the same unit, but for some reason when someone is calling the music is mute but no paused, it means i must decline the call pause the music and return to the person who called me. Is there any solution for that?

 

[syasyafiq12]

Guys, the reason your unit doesn't have EQ or fader is that it's missing an audio chip. Older units all had it, like YT9216, YT9217, YT9218, and even (older) YT9213AJ. If you buy Android 8.x or 9.x then the audio chip will be present.

See the pictures below explaining the issue.

The audio chip is TDA7729 (TDA7719 , CSC37033 , SCS37534).

Now there is a fix but it requires advanced soldering skills and a proper setup.

Sorry to be the bearer of bad news.

Hi sorry for asking. I've been trying to find guide to add audio chip.. mine is 9213aj v1.2 and dont have audio chip.. can you share the process?

 

[ExtremeMOD]

Hi sorry for asking. I've been trying to find guide to add audio chip.. mine is 9213aj v1.2 and dont have audio chip.. can you share the process?View attachment 5486553

Sorry but we don't have yet completed this guide. There are resources online on this particular mod. Look around.