I. Have a profx12. I am running just into laptop.i want to use my jvc receiver to playback recording instead of listening through headphones. Is this possible.

i suggest you contact Behringer Customer Service for advixce. Without the setup in front of me, it's hard to figure out the wire routeing, switch positions, ect. that may be leading to this problem. As they would be the people most familiar with the gear, they'sd be the people to ask. http://www.music-group.com/support/behringer/askquestion

I've found Mackie to be quite helpful when problems arrise. Their consumer support link is-

Contact Support Mackie

Be sure the capacitor was replaced with the correct polarity?
in the beginning of my tech career I have replaced caps back words on accident. ..

1. Check the Headphone Output:
   • Make sure that the headphone output jack is clean and free of any debris. Sometimes, dirt or dust can accumulate and affect the signal.
2. Output Mode:
   • Double-check the output mode settings on your Boss BR 1180. There might be a setting that affects the stereo output, so ensure that it is set correctly.
3. Output Routing:
   • Verify that the output routing settings are correct. Check if there's a setting that might be causing the output to be directed to only one side.
4. Master Output:
   • Check the master output settings to ensure they are balanced. If there's an imbalance in the master output settings, it could affect the stereo playback.
5. Factory Reset:
   • Consider performing a factory reset on your Boss BR 1180. This can often resolve software-related issues that might be causing the playback problem.
6. External Monitor:
   • If possible, connect the recorder to an external speaker or monitor system using the appropriate outputs to see if the issue persists.
7. Contact Support:
   • If none of the above steps resolves the issue, it might be a hardware problem within the unit. You might need to contact Boss support or a professional technician for further assistance or repairs.

Blown or defective Headphone Amp IC or alternatively a defective Pot. Either way only AVID can fix it for you.

Outside parts and service is impossible.

This is probably pilot error. There are a bunch of things to do to setup this correctely. I would recommend looking at the videos about mixer setup on YouTube. There is a procedure you go through that is COMMON to most brands of the mixer. The fact that the volume meters aren't working at all implies a problem that the mixing buss is not receiving audio. Turn trim gains up, turn the faders both the channel and the main up, and UNMUTE the channels of interest and you should be getting audio through the unit. ALso does your headphone jack work?

Make sure the Windows computer has the audio output selected to use the computers output hardware.

In the control panel, under "sounds and devices" pane, VOICE tab, that the Voice playback window shows your COMPUTER's audio system AND then check the volume is turned up by clicking the Volume button right under that same window. Now do the same under the AUDIO tab at the sounds and devices pane.

You have to make sure that the clockspeed of the program that you use to play the files back with matches the clockspeed of the program that created them. I might be wrong about that. Here is a good resource:http://forum.recordingreview.com/f18/midi-troubleshooting-101-a-5208/ You will have to join to access but its free and the Killer Home Recording setting up is also free from the site and is full of good info.

try hooking headphones to the output and see if the crackling is still there.

then, try it with the speakers, at a lower computer voume level and higher speaker volume level. perhaps the headphone output is too loud and distorting in the speaker inputs.

This may also sound stupid but; have you tried a different set of headphones? If you have never used the headphone jack there might be a chance that the contacts inside the jack are dirty from airborn pollutants such as cigarette smoke or cooking smoke. Another good example is if you have a flute or silverware laying around in the open , they will tarnish from the sulfur dioxide in the air. Try spraying a very small squirt of contact cleaner on a stereo plug and plugging and unplugging it into the jack. Make sure you do this with the power turned off. If that doesn't work, do it to the jack itself. Only use a very small amount. If that doesn't work you may have a bad solder joint in the connections to the jack or a circuitry problem. The jacks sometimes a have a built in switching circuit to defeat the signal when phones are plugged in and sometimes the jack fails. Hope this gives you some ideas.