Have a DMH-1770NEX I bought a year and a half ago.  About 3 weeks ago, screen went completely black and I thought the unit was dead.  Then randomly the splash screen came on with vertical lines through it.  Now the splash screen comes up that says NEX on it, but it never gets farther than that!  Backup camera works.  I have heard the AVIC line has a series of crappy sd cards, does this model have this as well?

Anyone have any ideas on how to fix?

HI

stripes looked like this?

YES!! That problem went away and now it just says NEX on the screen and never gets past it.

this is a manufacturing defect.
bad soldering flash ROM (U27)
repair will require a soldering station and force firmware rewrite

I can provide detailed information on how to fix the defect. but you will need to be able to use the soldering station

thanks. I can do that. Can you provide? Thanks

This problem is for models
DMH-160BT,DMH-1700NEX,DMH-1770NEX,DMH-A4450BT,DMH-A4480BT,SPH-DA160DAB

I have a service bulletin for SPH-DA160DAB
the repair process consists of 2 parts
1. soldering
2. Update FW

I have files only for SPH-DA160
NO WARRANTY THAT THE FIRMWARE FILES WILL WORK WITH DMH-1700NEX,DMH-1770NEX

Bulletin Nr. 1918

Hello, 

I do not have the tool you have that switches the illumination and power supply on or off. But will that be okay if I connect the wires to a power supply generator and use a breadboard to give certain ground and voltages to the specific wires? I am thinking of creating a simple switch-button circuit for the illumination

On 4/16/2023 at 11:18 PM, asd255 said:

This problem is for models
DMH-160BT,DMH-1700NEX,DMH-1770NEX,DMH-A4450BT,DMH-A4480BT,SPH-DA160DAB

I have a service bulletin for SPH-DA160DAB
the repair process consists of 2 parts
1. soldering
2. Update FW

I have files only for SPH-DA160
NO WARRANTY THAT THE FIRMWARE FILES WILL WORK WITH DMH-1700NEX,DMH-1770NEX

Bulletin Nr. 1918

 

On 4/17/2023 at 12:18 AM, asd255 said:

This problem is for models
DMH-160BT,DMH-1700NEX,DMH-1770NEX,DMH-A4450BT,DMH-A4480BT,SPH-DA160DAB

I have a service bulletin for SPH-DA160DAB
the repair process consists of 2 parts
1. soldering
2. Update FW

I have files only for SPH-DA160
NO WARRANTY THAT THE FIRMWARE FILES WILL WORK WITH DMH-1700NEX,DMH-1770NEX

Bulletin Nr. 1918

 

@asd255 i know its been a while since you posted this, but i joined the site just to thank you...my 1770nex was freezing and rebooting nonstop...only once a white screen....when i pulled the unit apart, the chip didnt even look soldered, i flowed it, but also tapped it with the iron so i could actually see some solder...so far hasnt frozen once....so thanks very much!!!

3 hours ago, jb. said:

@asd255 i know its been a while since you posted this, but i joined the site just to thank you...my 1770nex was freezing and rebooting nonstop...only once a white screen....when i pulled the unit apart, the chip didnt even look soldered, i flowed it, but also tapped it with the iron so i could actually see some solder...so far hasnt frozen once....so thanks very much!!!

Thanks for your feedback.
we now know it works
I was glad to help

On 4/16/2023 at 10:18 PM, asd255 said:

This problem is for models
DMH-160BT,DMH-1700NEX,DMH-1770NEX,DMH-A4450BT,DMH-A4480BT,SPH-DA160DAB

I have a service bulletin for SPH-DA160DAB
the repair process consists of 2 parts
1. soldering
2. Update FW

I have files only for SPH-DA160
NO WARRANTY THAT THE FIRMWARE FILES WILL WORK WITH DMH-1700NEX,DMH-1770NEX

Bulletin Nr. 1918

 

Thanks for sharing, this helped me out too for DMH-1770NEX. So far my car radio seems better off, but the problem has been intermittent before the fix, so may take a week or two to know for sure if this fixed it on my end. There was nearly no solder on the pins as-is, so hoping this will stay ok.

I'm curious if anyone has the forced update files for DMH-1770NEX? I have the latest firmware (CUST_PIO.BIN w/ CUST_PIO.md5), but wasn't sure if the additional files (ISPBOOOT.BIN, ISPBOOOT.md5, turndegradedmode) from the upload are compatible with this model. Would like to do this just to have a clean firmware on the radio, just in case some files were corrupted on U27 (looks like it is ESMT's F50L2G41XA?). Thanks!

On 4/16/2023 at 10:18 PM, asd255 said:

This problem is for models
DMH-160BT,DMH-1700NEX,DMH-1770NEX,DMH-A4450BT,DMH-A4480BT,SPH-DA160DAB

I have a service bulletin for SPH-DA160DAB
the repair process consists of 2 parts
1. soldering
2. Update FW

I have files only for SPH-DA160
NO WARRANTY THAT THE FIRMWARE FILES WILL WORK WITH DMH-1700NEX,DMH-1770NEX

Bulletin Nr. 1918

 

Hi, can you provide the detailed instrucitons on how to repair or point me the way. thanks

i know how to solder, board level IC.

Hello all

does anyone still has the SPH-DA160DAB service manual or info on solder job and firmware update please ?

Got that white screen for 2 weeks now on the radio..

Thank You very much for the help.