Kicker cxa300.4 low audio issue

[rhempz01]

I now have a kicker cxa300.4 that has rail, and regulated voltage. Powers up fine, and draws @1 amp of current. Plays audio very low even at max gain. I been searching around for damaged components and can not seem to find the culprit. Some help would be most welcome.

 

[rhempz01]

Topside of pcb

 

[rhempz01]

Bottom side of pcb

 

[barber02]

On the bottom side of the PCB on the top edge of the board about in the middle of your tweezers I see what looks like a broken trace or bad solder joint.

 

[PapaZBill]

Possible muting issue.

First check if any DC voltage between Power & Speaker Ground. If so check resistance between same. If Open check for open traces and RP87-0 ohm resistor. You may recall previous threads I've brought this up Rhempz01. This is a very common issue.

If that's not it check the DC voltages at the PWM daughter board pins and post. Starting on either side of the board and label Pins 1 through 13.

The muting circuit uses a C945 JFET at the input to each channel. One by One remove Q19 through Q22 to see if the mute clears and isolates to one channel

 

[rhempz01]

Still just pulsating. Changed entire channel, testing for voltage at the backs of the rectifiers they have - 1.51vdc. Tested each channel. All have the exact resistence all the transistors and or mosfets as well.

 

[PapaZBill]

Still just pulsating. Changed entire channel, testing for voltage at the backs of the rectifiers they have - 1.51vdc. Tested each channel. All have the exact resistence all the transistors and or mosfets as well.

Should this have been posted to your current thread?

Kicker CXA300. 4 pulsating protection issue.

 

[rhempz01]

Yes it should have been.

 

[PapaZBill]

It's difficult to maintain continuity between two threads. Please repost #6 to the related thread.