Originally Posted by stanger89
I'd consider any projector like that broken, and seek an immediate replacement, that sounds like an anomaly.
I think they would be within the manufacturer's tolerance. Some people get cine4home to pre-screen their purchase of a JVC projector to make sure they get a good one and to have Cine4home pre calibrate it. Cine4home do not say what percentage of JVC projectors fail to meet their standards and what percentage are good.
dead, permanently on or off pixels
"JVC officially accepts no liability, up to a number of 200 (!) Pixel errors (no matter which color or whether always luminous or always black), but declares this upper limit as technically "normal". This number does not seem acceptable to any home theater fan, but in practice it is never achieved in practice. Nevertheless, the manufacturer does not guarantee pixel-freeness!""Many X500 have one or two blue glowing pixel errors in black, some light, others dark.""In the X700 we tested, however, no pixel errors have been observed. Apparently the additional panel selection makes itself felt positively here."
"Critical large-scale fans criticize the new X-series also increasingly bright corners, which lighten the black value in the extreme edge areas somewhat. These bright corners are not a new phenomenon, but technically available for all (!) LCOS projectors. They are caused by the bonding of the panels with the silicon chip. However, due to the extremely high luminous efficacy of the new series (see below), they will be somewhat more pronounced than before." "As a rule, however, these corners are so weakly pronounced that they are not visible in the film operation. Devices which do not comply with this standard are sorted out."
streaking of white on black.
"In recent years, the X-Series has consistently attracted attention during our quality checks, which showed too much streak formation with strong contrast transitions, which we consistently patterned." "This has not changed in the current generation, all the models we viewed showed a slight streak formation, which becomes visible in black text in front of black background at close range. We can, however, give an all-clear: they do not fall from normal viewing distances. Outliers with too clear streaks we look out."
some vary by 290K across the screen
"Most of the X500 / X700 are within the tolerable range of <290K deviation, but often use it. In other words: outliers who exceed these limits (and thus also become visible in films) are very rare in JVC, but devices with almost perfectly homogeneous color temperature are also rare."
and some having a green primary so far off the standards they cannot be calibrated.
"the problems of some X500: Their native green point is too yellowish and therefore can not be balanced despite color management. A perfectly standard calibration is not possible with the affected devices."
Then there are JVC DILA projectors that suffer from gamma drooping after several hundred hours use. And need recalibration with JVC software and a sensor to update their firmware.
DILA is still uncommon in commercial theatres and use in film color mastering. Where DLP appears to still be the norm. Another issue with DILA as far as color mastering appears to be inconsistency overtime of colors, both inconsistency each time the projectors are turned on and overtime while they are on.