I searched the forum with relevant words before posting but didn't find anything about this issue, so my apologies if this has been discussed before. This is my problem: My Pixi+ touchscreen conked off a few days ago as I have apparently committed the unpardonable sin of letting my battery discharge completely one night. Ever since then, the touchscreen works fine when the phone is charging it but refuses to come out of sleep mode once the charger is unplugged. The phone passes all the interactive screen tests (while charging) and I have been through the soft reset, hard reset, even doctored the phone, nothing works. I have always only used the original charger and micro USB cable that came bundled.
Is this a problem of the digitizer? Then why is the touchscreen working while on the charger and not while off it?

Please help. Thanks,