BEHRINGER XENYX 2222FX POWER SUPPLY REPAIRED BUT NO AUDIO AND MAIN AUDIO OUTPUT LEVEL LED NOT RESPONDING

It sounds like you're experiencing a couple of issues with your Behringer Xenyx 1204FX mixer. Let's address each of these problems separately:

1. DSP Display Not Illuminating: The fact that the DSP display works when you press down and turn the knob suggests that the issue might be related to the display itself or its connection. Here are a few steps you can take to troubleshoot the problem:
   • Check Power Source: Ensure that the mixer is receiving proper power and is turned on. Sometimes display issues can be caused by power-related problems.
   • Connection: Make sure the ribbon cable or connector that connects the display to the circuit board is properly seated. A loose connection could be causing the display to not illuminate.
   • Faulty Display: If none of the above steps work, there might be a problem with the display itself. You may need to contact Behringer support or a professional technician to get the display repaired or replaced.
2. AUX 1 Send Not Working: If the AUX 1 send is not working as expected, there could be several reasons for this:
   • Routing Settings: Make sure that the AUX 1 send is properly routed to the desired destination. Check the routing options on the mixer to ensure that the signal is being sent to the correct output or destination.
   • Level Controls: Verify that the level controls for AUX 1 are set correctly. Make sure that the AUX 1 knob for the specific channel you're working with is turned up.
   • Effects/Processing: If you're trying to send a signal with effects applied, check if the effects are set up correctly. Sometimes, an incorrect effect or routing setting can affect the AUX send.
   • Cable and Connections: Ensure that the cables connecting the AUX 1 send to external devices (such as monitors or effects units) are functioning properly and securely connected.
   • AUX Master Level: Confirm that the AUX 1 master level (usually located on the main output section of the mixer) is turned up to an appropriate level.

If you've gone through these troubleshooting steps and the issues still persist, it might be a good idea to consult the user manual for your Behringer Xenyx 1204FX mixer for further guidance. If the problems continue, you may need to reach out to Behringer support or consider seeking assistance from a professional audio technician or repair service.

You don't say what cables you are using. If you are not using balanced cables (TRS) this is probably your problem.

You are unikely to find these as Behringer are very protective and anyway it is VERY unlikely you'd be able to make a cost effective fix even if you did get one.

More than likely, something has happened to the internal pathways to make it become unstable.

Have you tried unplugging EVERYTHING from the board? If not, try that, and just watch what it does with nothing but the power cord connected to it.

If unit still click off/on, then it probably needs service. I'm not so sure this is worth tackling yourself, unless you're willing to risk losing it altogether. Might be fun just to see what happens though. Good luck.

its the mute switch or the rheostat(slide)

Why did you change the fuse? If it was blown, then power supply has failed. Here is your schematic. The power supply is on page 14.

http://elektrotanya.com/behringer_ub-2222fx-pro.pdf/download.html

Scroll down the page at the site to the "Get Manual" Click on that to download the schematic. When working on line operated supplies use an isolation transformer for personal safety. The regulator chip IC2 has probably failed but test before changing. HINT: When restoring the supply, put a 60 watt light bulb in series with the hot power lead to act as a resetable fuse... saves fuses and also other components if all the bad parts haven't been weeded out.

Is the sound a low frequency buzz or high frequency hiss? With all the input level controls at the minimum position and the output level controls at the maximum is the sound audible?

Waiting clarification, don't hesitate to post.

Thanks and regards
Please kindly rate this solution
Stelios
direct fixya link: http://www.fixya.com/users/technical114

The Phantom power comes from a seperate winding on the switching power supply.Likely one or more of the other voltages are not present due to a failure of one or more components. The supplies are current limited so a short anyplace on the board may cause the problem. I had one of these short betwen the +/- 15 volt busses because somebody spilled liquid into it.

Here is a close schematic... a slightly different model with less channels, but circuoitry is the same, just more copies of it in yours: I believe it is zipped with four files... the last is the power supply.

http://elektrotanya.com/behringer_xenyx-1222fx_v1000_dpm5m_ub-spsu2_sch.zip/download.html

This is likely a pwer supply problem... BUT do check that the power cord is properly seated... pretty common that these work loose.

I have trouble my new behringer xenyx 1204FX VU led dead , like new VU it must play , how to repair this unit VU light