Unfortunately the symptoms indicate that there is actual internal hardware damage. Even if there are not internal cracks, the fall can compromise the integrity of the internal lcd panel (screen), where the layers bend, break, and delaminate, causing the picture issues you are seeing.
There is no fix for this. No reset, settings, or adjustment will help, as there is internal damage.
To resolve it would require replacing the entire lcd panel (screen assembly) which is virtually never practical. The part alone costs as much as the tv is worth, and labor costs quickly doubles that. The warranty does not cover physical damage like this.
Your best option at this point is to replace the tv with a new model. You can get a new 32" tv for around $200, even for the same model: http://amzn.to/290z5yf
Best regards, ***** ***** for the news,
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