Is it hardware issue if phone only displays logo, but flashing doesn't help ???

My sony walkman wt19i just stopped displaying anything on the screen one day, just backlight. Android also wasn't booting up, since I coudn't receive call not pc recognised the phone. So I tried flashing it with official firmware with flashtool, nothing changed.
So I took to service shop, they said its display and I need new one, which was expensive and they were not even sure if they could get it since its older phone. So I gave up on that.
That would be the end of it, but today I tried turning it on again and voila ! it displayed sony logo and animation that follows it. Android booted and pc recognised the phone, but still no display on android.
So I am wondering what is going on here ? People at the service shop were wrong, because if it was dead display then it couldn't display sony logo and complex animation that follows it, right ?
If this is not display issue, then what it is ? There is still only backlight and nothing alse shows up once android starts.
If flashing doesn't help, does it mean its a hardware issue ? Is there anyway to fix this phone ? What could be wrong ? Any help is welcome :)


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