Default New digitizer problem

Hi I have replaced the digitizer with two different digitizers bought from eBay. The first one seem to be an imitation since it can not be calibrated using the calibration file from fast boot and has a smaller chip from the original and the second one has the proper chip can be calibrated but calibration does not work. The first one does have some dead spots and is not sensitive on touch. The second - original one has horizontal dead zones every 1 cm space. I have tried the pin method and letting the battery drain and recharging and every other method mentioned at the forum but nothing works. The first digitizer was not broken it has stopped working after a phone fall. Could it be a main board failure? is there anything else I could check? thanks in adavace.

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