when i was first screwing around with LCD's i had a part's express 4" LCD that just had RCA out. When all was hooked up (all I had to provide to it was the voltage and of course the RCA signal) the LCD would seem to 'half power up'. There would be no picture but what it looked like was that half of the backlight would be on. The left side and corner would be lit up (no picture though) but the right side, nothing. So I realized I was giving the LCD the wrong amount of voltage from my ATX PSU. I was giving it the lower end of the voltage and that is why it only 'half powered up'. Check to make sure you are giving it enough power. That's about all I can tell you...
Hope that helps ;o)



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