Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

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Black Screen,, can barely see.

Screen goes black after turn on. Images just barely visable. All functions seem to work fine.

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Jim, sounds like a backlight issue. Remember that the backlight is in your LCD. So it could be the LCD itself, check the ribbon cable, make sure there are no tears on there. Next would be the backlight coil 6R8. It does not have to look damaged to be damaged. You would most likely had a catastrophic failure, (mostly power related) if it would look damaged. You can check the coil with a ohm meter. If the coil checks out okay, then the next part is the IC 109B, which is the backlight IC. That would mean either a reflow, or a reball to replace the IC. Having no backlight, due to a bad coil or IC, should not cause you any long term damage.Hope this helps, good luck.

I attached the schematic for the LCD connector as well as the backlight circuit, this way you could check the coil as well as the connector

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