How to fix ipad 3 that become sometimes pixelated?

I just bought an ipad 3 off Ebay. It have pixelated display. It is not a fake display since, sometime after using the ipad for some while the display turns normal.

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What do you guys suggest. Do you think it is bad cable problem, connector or bad GPU. And if it turns out to be GPU how do I reflow it. Thank you.

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