Only blocks with the lower on 50% of the light power..I think something got lost in the translation.
If you are saying that you have one row of blocks then you have a different problem.
If the single row of blocks appears to be on the lower half of the display then you have the display upside down.
Excuse me for my weird post, i was kinda drunk, haha.
What i mean, the lowest of the 2 bars on my lcd appears to have only 50% of it's light printed. I have the same problem as HHTHH so i suppose my lcd is also defect.