Behringer ub802 mixer is buzzing even when no input when i hook my head phones into the headphone jack and main output jack

IF your Laptop has a stereo LINE 1/8" INPUT jack, you can take the Stereo ( Left & Right ) LINE outputs on your mixer and feed into this jack on your PC. You will need a 1/4" dual plug for the mixer end to a single 1/8" stereo plug on the PC end. I suspect the problem you are having is either related to your PC only have a MIC input jack or you have something set wrong in your PC's sound config. file. More information is needed to properly solve the problem.

Sounds like it may have failed. Yes, it is likely that it needs to be returned. Another option is to unplug all inputs and outputs. Plug in ONE device into the board, and use the headphone jack on the board. Does it sound the same? Just basic troubleshooting may help.

Sounds like the output cable from the 802 is not correctly pinned to your input on the computer. Fred is on the right track but you may need to take it a bit further.
It may also be helpful to use a Pro USB audio interface such as the Digigram UAX220v2 (line level version).
If you wish to use the computer's on board sound card consider an IHF/Pro interface that converts balanced audio to unbalanced , and the proper cables. Two 3-wire balanced 1/4-inch from the 802 to the left and right inputs of the interface (XLR Male), then RCA (Red and White) to a 1/8-inch TRS Plug cable onto the the computers audio input.
Henry Engineering's Matchbox HD comes to mind.
Good Luck.

It can be a number of things.

Bad ground, excess gain, excess number of mixer channels with no inputs, Make sure the mixer inputs you are going to use are the only ones that are up. Power supply noise- flourescent lighting noise, Clamp on ferrites on the power cords of everything can help reduce this. You can sometimes track the offending source with a battery powered AM/MW radio.

It can also be caused by going from a balanced output to an unbalanced input with some impedance differences.

Here's the manual. page 8 Good Luck!




http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000064843.pdf

ALL LED's should NOT be lit all the time. If thsy are, there is a failure in the power supply.

plug headphones into the 1/4 inch main output jacks on the top... you will only hear sound in the left side headphone for each. This would verify the preamp is working.

DO NOT connect your in-ear monitors to the power amp out using the MAIN/Mon speaker option as it would be goodbye hearing and fried ear buds..
Get a very small and in-expensive headphone amp and connect its input to the 1/4 inch Monitor output jack.

just use the main left and right outputs of the behringer to run xlr (3 prong balanced) to 1/4 inch (looks like a big headphone plug) cables into the inputs of the crown amp. the mixer has the xlr outputs and the amp has 1/4 inch inputrs, sop the cables will have to reflect that on both ends. run the outputs of the amp (rca outputs, i believe, you may have to get a rca plug to 1/4 inch jack adapter, and then use a 1/4 inch speaker cable) to the inputs of the speakers, again, the amp has rca outputs and the speakers will likely have 1/4 inputs, so you will have to address that wil an adapter. have each speaker in its own channel.

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

Behringer only give the manuals to their authorized service agencies I am told.

Mixers are very symetrical and have lots of diagnostic capability from the outputs.

If you headphones work, chances are the moxer biss es are OK which probably focuses the problem on the output drivers.

Use headphones to see what jacks work... Remember that a stereo headphone will only have sound on one side for the mono jacks you test.

If your mains have a dedicated slider, one half of the slider could be bad. Usually you can tell those by a rougness as you slide them.