My DSP-A1 display screen quit lighting up. Everything else works fine-just no screen. Can it be fixed?

https://www.hifiengine.com/manual_library/yamaha/dsp-a1.shtml?_e_pi_=7%2CPAGE_ID10%2C1711428461

Can i connect a powered subwoofer to center channel pre-out connection inYamaha DSP-A1

If you soldered something and now it wont work ,check the items and connections that you soldered.

Either the power switch is shorting out, or you could have a faulty or somewhat faulty resistor or capacitor on the power board. You can test them with an anlalog meter. Each component has an imprinted number on it to determine it voltage and ohm rating. That number should match the number on your tester.
Some units also have relays in them. The little square plastic boxes. You can test these with an ohmmeter but you would likely have to pull the circuit board to test the relay from the solder joints on the bottom.

My Yahaha DSP-A1 had the same problem. Apparently its quite a common problem, caused by the heat from the LEDs causing the solder joints to fail.

I fixed mine by removing the front panel, and resoldering all the connections on the back of LCD panel - and it works fine now.

Its not particularly difficult, but is a bit fiddly and does require the use of a small soldering iron.

If you are tempted to try it, these links show help

http://www.youtube.com/watch?v=eiJRmpfKxBM
http://www.avforums.com/forums/av-amplifiers-receivers/1058423-yamaha-dsp-a1-display-fix.html

Best regards and good luck

In the manual it says switch off leave for 30 seconds and switch back on .

you need to set the ntsf or pal settings for hdtv and s-video is video1 video 2 or video 3 seting on input on remote

to get to the diagnostic menu on the machine press power button set menu + button and next key all at the same time which will take you to the diagnostic menu

Over the years the solder joints on the display panel become bad due to the heat that the display puts out. The way to rectify this take the cover off and dis-assemble enough to get to the display. Then using a soldering iron re-solder all of the joints on the board. You should be able to see the joints that are bad as they will wiggle. If you are un-comfortable soldering then try to find someone that is. There is a your tube video on doing this as I learned tonight. I have not done this procedure yet, but I have had the same problem for over 2 years. The display does not even work any more. Now that I have learned what the problem is I will be doing this when I feel like unhooking everything.

The display problem is because the solderings on the back of the display are broken. To fix it you have to open the amp and redo the solderings (there are about 50 or 60 of them). There is a Youtube video that shows how to do it. I have fixed this on my DSP-A1.
I also have the problem with the motorized volume control. I have tried cleaning it, and it works for a few days, then it's stuck again. I guess I will have to replace it to have it fixed permanently. The part number is VZ621400, a new one costs about 40$.