I've unplug the phone for 30 min and still no pic nor any display. screen is completely blank

Sorry to state the obvious, bit just in case, have you checked to be sure the screen is turned on? Press and hold the volume knob for a few seconds. There is also a display off button on the dash to rt. of the display unit.

If all are on, try resetting the unit:
http://www.youtube.com/watch?v=vEGuqiS3EGU

Probably not...sounds like you did about all you can do.

Is it a touch screen? Has it been dropped at all? If so, the internal screen could be busted. Sometimes the touch part will still work itll just be a blank screen though. You may need to order a new internal lcd screen.

Hello,

You would need to change the screen. Go to a phone repair shop to assist you in changing the screen. It will cost you a little.

Best regards

tv is on but no picture

Ok, leaving a battery for that length of will run it down.
If you plug in the phone you could see the screen staying blank for up to 30 mins.

If the above did`t help.go to a shop where you can try a new battery.

I hoped i`ve helped.

IN ur sonyericsson phone there is prblm of motherboard plz contact sonyericsson center 1800-11-1800(toll free) no. ask about ur prblm.TTHANK U THIS IS DEVAL

Just got off the phone with Acer Suppport. This was after I sent an email to them, that suggested that I call. 8-/ annoying. So the guy on the phone says there is one thing that we can do before sending it in. Unplug it completely for the wall and computer. Hold the on/off button in for 30 secs. reconnect power and the computer. It worked for me

u need to do hard  reset of ur fone and pls take back up before that...or else there is problem with charging slots pins and turn on/off button,,,,,,,,

your problem is the LCD..have it changed already...it works mostly