televisions

Panasonic TC-55CX420U 4K LED TV Review

54.6 in.

This silver-bezeled, affordable 4K TV may be the perfect choice for some buyers.

Credit: Reviewed.com / Lee Neikirk
February 02, 2016
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Calibration

CX420U-Calibration
Like the CX400U, the CX420U doesn't feature advanced 20-point white balance controls, nor backlight or gamma controls. Fortunately, I was able to make small improvements using the 2-point control.

Contrast Ratio

CX420U-Contrast
The CX420U boasts good contrast for the price. Using a standard ANSI pattern, I measured a black level of 0.047 and a reference white of 209.80, giving the CX420U a contrast ratio of 4010:1.
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Viewing Angle

CX420U-Viewing
The CX420U doesn't offer up the best viewing angle, though it's on-par with similarly sized 4K LED TVs. I measured a total viewing angle of 36°, or ±18° from the either side.

Color Gamut

CX420U-Color-Gamut
While not perfect, the CX420U's out-of-the-box Cinema mode color is quite accurate for a 4K set in this price range.

Grayscale & RGB Balance

CX420U-Grayscale
CX420U-RGB-Balance
The CX420U's grayscale and RGB emphasis suffered from under-emphasis of blue in the Warm color temperature setting, resulting in the grayscale dE above. Small tweaks to the "gain" side in 2-point white balance corrected the upper half.

Gamma

CX420U-Gamma
The CX420U posits a mostly flat 3.5 gamma curve across the grayscale input, which is fairly well suited for a dimmer "movie night" environment.
Our editors review and recommend products to help you buy the stuff you need. If you make a purchase by clicking one of our links, we may earn a small share of the revenue. Our picks and opinions are independent from any business incentives.
Our editors review and recommend products to help you buy the stuff you need. If you make a purchase by clicking one of our links, we may earn a small share of the revenue. Our picks and opinions are independent from any business incentives.
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Our editors review and recommend products to help you buy the stuff you need. If you make a purchase by clicking one of our links, we may earn a small share of the revenue. Our picks and opinions are independent from any business incentives.

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