Softbank sold 2 different versions of the HTC Desire. One is named X06HT and the other one X06HT II.
They are basically the same, there are only two differences. The version of Android and the screen. The X06HT comes with Android 2.1 while X06HT has been upgraded to Android 2.2.
The X06HT features a AMOLED display made by Samsung. The newer X06HT uses a S-LCD display made by a venture of Sony and Samsung. There are several practical differences between the two displays. The new display has higher resolution which helps to read small text and more accuarate color reproduction. The power consumption varies depending on the use for both screens. If you have a dark background AMOLED is more efficient, but S-LCD efficiency outperforms the AMOLED when watching bright colors such as those on games and websites.
At LoreaTec we can fix HTC Desire models such as X06HT as well as X06HT II phones. We can also fix the HTC Desire HD and other HTC smartphones.