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Check the burned out LEDS with a 3 volt battery- a computer bios battery works well for these.
If they do not light, which is likely, just replace them with similar sized units. You can even change their color too. Measure the voltage at the LED sodler pads to see if it is more than 3 volts, if it is, add a resistor to drop the voltage and limit current to the replacements. Digikey sells them, and they ship around the world http://www.digikey.com or Mouser, Both are based in the US, I am not sure what Mouser's international shipping is. http://www.mouser.com
If there is no voltage at the LED pads, look for bad solder connections, or burned out resistors. If the few remaining LEDs still operate as they should, the level meter chip "should" be okay.
Just having "volts" does not guarantee they are the right voltage. Check that the adapter you are using is the right one... this device MAY require a higher current than some and low voltage could cuase the failure. Verify the adapter is the original one... if on batteries, replace them with known good ALKALINE batteries. Music devices for the most part will NOT operate reliably on rechargeables.
Are you using battery or AC adapter for power?
Most pedals won't allow you to use both. Check that there is no battery installed if you're going to plug it in. If you are using a battery, Some pedals won't light an LED on battery power.
If problem persists, your pedal may be DOA
I can't solve the problem, but just wanted to sympathize because I have the same problem. My pedal is broken on my Yamaha Clavinova cvp85a. It worked wonderfully for years but finally it broke. I'd be in the market for buying a new pedal or fixing the old one. But I've not found any suggestions in any of these forums for either solution.