Audi Amplifier Bang & Olufsen 8T0035223T help after water damaged

[k1tt]

Hello all

Has any one work with amplifier from Bang & Olufsen?
I have this AMP from Audi A5, after water damage burn one FET and damage some components around including PCB.
does anyone have a photo around of this FET, or can me help find ways that are burned?
593804

[k1tt]

Hello

i have some update and if is there anyone who can compare diagnostic values with a working piece?
DTC error is 00003 - control module , can not be deleted

595991
when i run test, no sound and all voltage are 0. Only fan run.
In measurements block is in groupe 3 show temperature 74°C i thing its not normal value and need compare withworking unit.
595994
Maybe after electronic fault when burn DC/DC converter for amlifiers was damaged eeprom. Can anyone send me eeprom for comparation?
DC/DC convereter was repaired, bud digital parts donot enable his start and i dont know why.

[RFRemotes]

Hello,
are you able to activate DC/DC converter manually?
Signal comes from pin 68 of ST10F276 and you can break this line and put 3.3V there for example from pin 14 of MC74LVX125 (its Vcc) near the ST controller to see if you will get +25/-25V after DC/DC.

Oh, this thread is over a year old not less than a month ... 2020 now ...

[navserwis]

Hi.
Do you have good dump for ST10F260. any signal from pin 68 ?
Can you help me ?

[got]

Hello, I need it too, but the Cpu is ST10F276 and Ee 95256w

Thanks

[miltisus]

Hi Everyone,

I know this is an old thread but I am having the same problem.
The two FETs are burned out and unfortunately they are not marked.

Can anyone please tell me which FETs are those?

Thanks,10075011007502

[Mankyro]

Hi Everyone,

I know this is an old thread but I am having the same problem.
The two FETs are burned out and unfortunately they are not marked.

Can anyone please tell me which FETs are those?

Thanks,10075011007502
20n06 ...........
https://www.ti.com/lit/ds/symlink/uc28025.pdf?ts=1705833608966

[miltisus]

20n06 ...........
https://www.ti.com/lit/ds/symlink/uc28025.pdf?ts=1705833608966

Thank you!
I have replaced the two MOSFETs and now I have in all 3 marked spots 12V and nothing on the other side of the trafo.. I think that the UC28025 also died..
1007543

[miltisus]

I have ordered the parts, see how that goes.
In the meantime I have bought a used one but I have Component security active. How can I turn it off with ODIS?

Thanks,

[miltisus]

Hi everyone!
I got the new parts, put them in, but the amp is still dead. Apparently the processing board is not starting. I have measured and it seams that the 3,3v for the ST10F276 and MC74LVX125 are missing. Can anyone point me which is the 3,3v power supply?
Thanks!