What else could be the problem?

[qtipextra 5,000+ posts]

What else could cause DC out to my subs?

I have checked everything that you can see a black mark on in this high res pic. That would be ALL the transistors, both regular power and the ouput ones too. Thats all the bigger capacitors, and all the big resistors (5W). None of them were bad.

What else?

Heres a High Res Pic:



One thing I should add, the amp doesnt go into protect, it just stays on, and giving my subs DC.

The more power I give to my subs, you can see the sub move out, but it is also moving back and forth at 40hz (the test tone I was playing to test). Then if I swap the polarities to the subs, the obvious happens, the cone moves in, but still resonates at 40hz, but with the cone offset moved in because of the DC.

I can fix it myself, I just need help finding out which componets are bad.

Click to read more...

 

[qtipextra 5,000+ posts]

Bump. Please, I need some help isolating the problem.

 

[qtipextra 5,000+ posts]

it is possible the amps PSU has a bad transistor. I've had a class D amp that had 1 bad transistor.
from the pic, i'm assuming the circled devices are the output transistors -- the devices used in the class D output stage. the grey toriods with loose wrappings are probably the output inductors with combine with the two long blue polyfilm capacitors to give an integrator. the smaller wire wrapped torid is probably a balun transformer.

the red wires take one output to an output terminal of the amp. the other red wire is connected to the relay and amp out. this allows the output to be fully disconnected in case of problems.

i can only assume the long, but oddly unsocked IC near these components is a hip4080, or similar PWM controller/driver.

you can also have problems with the other transistors.

Yes, that IC right there is a hip4080AIP.

 

[jujumantb 10+ year member]

Its a metaphor for you needing to "switch up your flow" //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

jk, I thought it was clever...

bump

 

[qtipextra 5,000+ posts]

I cant figure out wut else could be wrong to cause DC out to my subs, with the AC.

The more power I give to my subs, you can see the sub move out, but it is also moving back and forth at 40hz (the test tone I was playing to test). Then if I swap the polarities to the subs, the obvious happens, the cone moves in, but still resonates at 40hz, but with the cone movedin because of the DC.

 

[qtipextra 5,000+ posts]

Could it be the HIP4080AIP that is bad, would that cause it?

 

[qtipextra 5,000+ posts]

Well guess what? My amp is fixed! It was the hip4080AIP ic all along.

Cost me only 8 dollars for that part. Ahh, the benefits of repairing yourself.