This is a common problem with iDCS phones (falcon) sometimes all you have to do is unplug the phone from the wall for a minute and the reconnect it. If this does'nt work, the display is probably bad. The is no programming that will turn the display off.
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A black or blank screen appears generally due to the physical damage to your phone. There may be a broken screen or must be some problem in your integrated circuit(I.C.). I Have not seen your phone, so i cant tell you correctly but not better handle your phone to some authorised or local mobile repair shop. If their is circuit problem then i cant tell you correct cost, since it depends but your phones original screen will cost approximately $8.
Did you plug it directly into the cabinet with a 4-conductor base cord? Try that phone at a different location or another phone in the same location, making sure you take base cord and all. Either you have a wiring issue or a bad phone and this will tell you which.
I would say the LCD is dead. They seem prone to that because we have had to replace two handsets with exactly the same problem. The one lost the top row of the screen, the second is completely screendead. Though all is not lost. Any GAP compatible cordless handset will work with that base, so you can replace them and not have to buy an entire system :) Ebay is a good source for handsets only.
Unplug the battery. Hold down The * (star) and the #(hash) keys simultaneously. Re-connect the battery, phone will beep and screen will be blank. Press the voicemail (righthand silver key under the lcd screen). As above EEPROM/RAM message will appear. Place handset on base and your problem is solved.