Behringer pmh mixer manual. 20 channel 800watt powered mixer no speaker output. I need to test the power supply and the amp modual. Thanks

Question edited for clarity.

How old it is? They have a 3 year warranty. It sounds like an internal fault. Contact Behringer Support direct.

https://www.behringer.com/service/service-warranty.html?modelCode=P0567

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Hi, I think in most amps switching to bridge mode simply means the amp supplies its total power through the left channel only. It's the best way to use all of your amp's power but nothing comes out of the right channel. Having speakers connected to both channels would simply mean that only the Left channel works, it would not blow it. Some amps have the speakers wired to binding posts and this varies according to whether you want mono, stereo or bridged. I can't help with the power board sorry

Hi, When an two channel (stereo) amplifier is connected in bridge mode the polarity of one channel is reversed, for this example say channel B. An identical (mono) signal is applied to both channel inputs.
The output is now connected between the two channel +ve outputs. As channel A's output goes +ve , channel B's output goes -ve, thus doubling the output voltage.
On this Behringer powered mixer, the bridge switch simply connects the power amp section inputs, the required way.
The bridged output is wired to the B output between pins 1+ and 2+ of the 4 pole Speakon connector. (Because usually pins 1+ and 1- are used, stereo operation is unaffected.)
So.... If you connect a speaker from the A output alone then I would expect it to work, BUT if there is already a speaker connected from the bridge output, then what happens will depend on the amplifier design.
At best the A channel will see too smaller impedance, and hopefully shutdown.
This is a Behringer, it has digital (class D) power amps, and it does Not claim any amplifier protection !!!
If the powered mixer works in normal stereo, then it is probably OK.
If it then does Not work in bridge mode it is likely to be the connector wiring.
All the best.

Fix the short. It appears the 15 neg supply supplies the LEDs. If you need the service manual try: http://www.eserviceinfo.com/index.php?what=search2&searchstring=behringer+pmh+3000

follow this instructions and fix it. God bless you
Instructions

1. • 1
     Plug one end of a shielded input cable into the mixer's main output, and the other end into the crossover's input. The cable connectors will be dictated by your particular mixer and crossover, and will be either standard 1/4" or 3-pin XLR connectors. Consult the owner's manual of all components for specific details and recommendations.
     
     
   • 2
     Plug another shielded input cable into the crossover "high" frequency output, and the other into the crossover's "low" frequency output.
     
     
   • 3
     Plug the cable coming from the crossover "high" output into the channel one input on the stereo power amp, and the cable from the crossover "low" output into the channel two input of the power amplifier.
     
     
   • 4
     Plug one end of the unshielded speaker cable into the power amp channel one speaker output, and the other end into the horn tweeter.
     
     
   • 5
     Plug one end of the second unshielded speaker cable into the power amp channel two speaker output, and the other end into the woofer. The connections are now complete.
     
     

The outputs are usually just for the front of house speakers - the monitors usually need their own amps.

Check the manual.

You have 1200 watss of power - so keep the volumes REALLY LOW to try things out - otherwise your speakers could be blown by the amp.

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.

If LED's or other indicators are lighting, then the power supply is likely OK.

If nothing lights, then the supply has fried and LIKELY fried as a result of one of the power amps shorting.

If the shaft broke, then you will have to replace the whole encoder for it. You cannot glue a shaft and expect it to hold.

Try running the amp with no speaker cables connected. If it doesn't blow the fuse you know it's either your Speakon cables or the speakers themselves that are to blame (it's usually the cables)

If it still blows then there is a more serious problem with the power section.