Mojo 16 4k

[Hexhclass]

Amp plays good audio but it keeps dropping DC pluse rondomly.I see about 12v on the speaker terminals when it happens.

Any suggestions?

 

[Perry Babin]

Intermittently shorted transformer?

 

[Hexhclass]

I think the DLOGIXS chip on the output driver board died.
Probing around on the driver board forgetting to discharge the rail cap I think killed it.
Chip is getting warm and now i have no audio.

 

[Hexhclass]

Where can i get this IC?

The largest one.part number scratch out.

 

[Perry Babin]

These are the part numbers. I don't have a source.

 

[NadaD]

DLM4000 DLM4000A car audio amplifier class D output driver board | eBay

 

[Hexhclass]

Finally got the board but am back to my original problem.
The offset is more visible when the gain reaches about half way and up.I was not able to spot a short in the transformer.It behaves that way only with a load connected.

 

[Perry Babin]

Do you see any DC on the input of the driver board?

 

[Hexhclass]

The most i see is about 0.526v and that's with a load and input signal.

 

[Perry Babin]

I don't think there should be any. Follow the circuit back to see if you have an op-amp with excessive DC on the output.