I have owned my Pioneer DJM800 mixer for a few years now. Warranty is up on it. Decided to tighten down my headphone jack cuz it was getting loose. In order to do that, i had to take the top plate off (was 12 screws and a few sliders and knobs and it came right off so I could access nut for headphone jack, I touched nothing but the headphone jack nut. reassembled and hooked back up and No Display. So, my question is will a new power supply fix this problem? Reason why I ask is because I found someone else on here having the same problem with their djm 800 and someone responded that it is likely the power supply. Going to order a new power supply but wat to be certain this is probly the porblem as to why the display won't . Everything else works but the display. Please help! Thanks in advance, - Josh

*UPDATE*

I have fixed the problem!! =)

I took it upon myself to gain access to the display circuit board, I could push on the display unit (with the top plate off) and get the display to light up. I then gained access to that circuit boards under side and found that pin #1 (3.3 volt solder joint) had a cold solder joint. I could push the display down and see the pin move on the underside of the circuit board, indicating there was a cold solder joint that had fractured over time. Reflowed the joint and add a tad bit more solder (lead solder =) - too bad they have now banned lead solder. Without it, it seems that it is leading to soo many solder joint problems in electronics now days. Anyways, I am VERY happy that i was able to figure this out on my own. Just figured I'd post the results since I have noticed a few people having problems with this. If you have the same issue and can't figure it out let me know and i will help you the best I can.

I am now back up and mixing again with a DISPLAY!! =D - Josh *UPDATE*
I have fixed the problem!! =)
I took it upon myself to gain access to the display circuit board, I could push on the display unit (with the top plate off) and get the display to light up. I then gained access to that circuit boards under side and found that pin #1 (3.3 volt solder joint) had a cold solder joint. I could push the display down and see the pin move on the underside of the circuit board, indicating there was a cold solder joint that had fractured over time. Reflowed the joint and add a tad bit more solder (lead solder =) - too bad they have now banned lead solder. Without it, it seems that it is leading to soo many solder joint problems in electronics now days. Anyways, I am VERY happy that i was able to figure this out on my own. Just figured I'd post the results since I have noticed a few people having problems with this. If you have the same issue and can't figure it out let me know and i will help you the best I can.
I am now back up and mixing again with a DISPLAY!! =D - Josh