Im going to call this a situation where root rot is probable. If your leaves went dry, and since then youve be watering routinely, including soaking the tree on this weekly schedule the tree has no outlet to transpire the moisture (because the leaves are dead). The soil looks like poor potting mix, probably causing an anaerobic environment.
Were this my tree, Id stop watering it on a schedule, put it where it gets maximum sunlight, remove the dead leaves as LDingus said, and wait and see if latent buds pop. Id only water when the soil is dry to the touch for the first 1/4" of soil or so.
Personally, doesnt look promising to me. Good luck.