SoundDitigtal 400.4d EVO chip identification

[jfxwave]

I cant identify these 4 chip.
Any help will be appreciated.

Thanks

 

[ultra]

I am not sure but if the gate resistor is 10R you could try csd18533q5a

 

[Perry Babin]

Have you tried contacting the manufacturer to see if they could/would help?

They are likely something like the following FET. I am, in no way, saying that these are the FET you have. It's just the package style (from what I can tell from the photos).
https://www.infineon.com/dgdl/Infin...N.pdf?fileId=8ac78c8c7bb971ed017bb9a9887300a4

Is the driver IC defaced as well?

ultra:​

The gate resistors are 22 in the photo.

Are the CSD used in some of the amps you see?

 

[ultra]

To Perry :
I have seen csd18533 on Taramps amps.

It looks like they are directly driven by the 16 pin ic above them. It could be a 494 or a 3525 (easy to find out).

 

[jfxwave]

Perry: Yes you are correct the driver IC is toast.
Ultra: Driver IC is a 3525.

 

[Perry Babin]

How did you determine that the 3525 was defective? I'd pull the FETs and see if it had output.

 

[jfxwave]

I checked to see if it had PWM and i didnt get anything.
I will pull the FETS and check again.

 

[Perry Babin]

There are pins, that if they don't have the right voltage, will shut the IC down.

 

[jfxwave]

Thanks for the info Perry, I will look up that chip.

 

[Perry Babin]

Attached is some basic requirements for operation.

 

[laluns]

@ultra is correct on the mosfet and the SG3525. I have also found out that sometimes when the power supply fets blow, you may also have a problem with the outputs. I would also suggest checking the buffer transistors. They do go faulty when the 3525 shorts out. After you have replaced all faulty components and if you power up and the power supply fets get hot I would suggest you replace the output ICS

 

[jfxwave]

Thanks for all the info Perry and laluns.

First time working o that type of Mosfets and I fixed it with all the help you gave me.