Peavey PR15D amplifier board. What is the part number of U5. The IC is damaged and can only read the beginning of the part #. Starts with HC.....

You might thy going backwards from the output to the IC .have a good light and make yourself a pointer that is nonmetallic which you can track the copper strips on the circuit board without touching them. If you remove this IC from the board, be sure to wear a grounding strap to your hand or wrist, connected to the metal chassis.BE SURE TO REMOVE THE POWER CABLE BEFORE YOU BEGIN! Note the exact way you remove it. The number one pin will have a indented dot on the plastic case. Be sure to reinstall in the correct order. ALWAYS WEAR A GROUNDING STRAP TO HANDLE ANY IC! The static electric in your body can blow certain IC units. You can make you own grounding strap using an old metal watch band, a piece of flexible wire approx. two feet long and an alligator clip to attach it to the chassis. Hope this helps you and I hope I have not confused you.

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Operational amplifier ic that if my memory is correct are 4560D, one ic drives 2 channels...

The back doesn't come off. On the back beside the cord hookup and beside Channel 1 Input are screws. You unscrew the two screws on either side. You then have four screws on the top of the amplifier. Unscrew those four screws and pull them out, six screws in total, then the amplifier will pull right out. You then pull the plug that attaches the speaker to the circuit board off and then you can do any kind of Maintenance or anything you want to the KB2

The fuse is INSIDE the unit and if it blows, then there are other damaged components that require going to a repair shop to repair before replacing the fuse.

First thing is to make sure you are using either XLR or TRS balanced cables to connect to these. Also make sure these are powered from the SAME receptacle as you mixer or source... yes you likely will have to run extension cords to do this. When you meet the above requirements, test that the speakers are equal... if one of the symptoms follows the speaker, then we have probably damaged a speaker or have a defect. Get back to us with your findings. DO NO USE unbalanced cables to send audio to these. Unbalnced cables are TS cables like a guitar cable and are NOT to be used for interconnecting. ALSO give more detail on your setup such as mixer, etc.

Take it for repair immediately as there is something that is thermally sensitive and it may cause worse damage with continued use. The problem is LIKELY a broken solder joint. Depending on where it is, it could cause damage to the power amp portion. It OFTEN is at one of the leads to a volume control and those USUALLY don't cause damage, but one can't be sure till it is repaired. These broken joints oxidize and then eventually warm and punch through and the device starts working. You MIGHT want to try wiggling the controls to see if one brings the unit on immediately showing itself as the culprit.

One side of the amp has failed and repair is NOT DIY. Take it in for servicing. This amp has many components in the power amp and repair is complicated. A failure can lead to 20 components being damaged. Failure to replace all damaged ones can result in immediate failure destroying the replaced ones.

Use the series light bulb trick when trying to first power this up. Use a 150 watt bulb in series with the 120 volt power to avoid damage and blown fuses.

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You may find what you are looking for here if not you may have to call them.