We used the following calibration settings to review the TCL 65" Q825 (65Q825), and we expect them to be valid for the 75" (75Q825) version as well. These settings should apply to most types of content, except for gaming or use as a PC monitor, which require a few additional changes, listed below.
One of the first things we did was disable all of the auto power savings options, as we don't want the TV to adjust the image during testing.
For SDR content, there are five preset picture modes. We recommend choosing the 'Movie' picture mode, as it's the most accurate one out of the box, and allows for the most customization. From the Advanced Picture Settings menu, we recommend setting contrast to '100', brightness to '50', and sharpness to '20'. We also set Color to '45', and Tint (G/R) to '0'. Finally, we chose the 'Warm' Color Temperature.
To make the image brighter in SDR, you should first select the TV brightness range in the TV picture settings menu to one of the 5 preset options and then adjust the Backlight on the Advanced Picture Settings depending on your specific viewing conditions. Changing this setting does not have any impact on the overall picture quality. The Brightness setting is a picture adjustment setting, and we do not recommend adjusting it.
The Local contrast setting controls the Q825's local dimming feature. We recommend the 'High' setting, as the 'Medium' and 'Low' settings did not seem to do anything.
As we aim for an image that is as close as possible to the content creator's intent, we disable most image processing options, including Dynamic Contrast. You should adjust these to your personal preference, though.
HDR is automatically enabled for the native apps. When you start playing HDR content, a small HDR icon appears next to the picture mode on the quick settings menu. Once you start playing HDR content, some of the settings change automatically, including the Backlight. We recommend leaving these settings to their default settings in HDR.
For HDR to work from external devices, HDMI 2.0 usually has to be enabled from the HDMI menu for the input you are using. Older devices may have compatibility issues if this option is left enabled, so it's recommended to only enable this setting for devices that require it.
If you find HDR too dark, there is not much you can do without ruining the picture quality. You can try adjusting the Brigthness setting, but this will affect the picture accuracy and we do not recommend it. The image on the side shows the EOTF before any adjustments.
Although we disable most motion enhancing functions for most of our tests, you should adjust these to whatever looks best for you. Some settings may need to be adjusted depending on the specific content you are watching.
The TCL Q825 has an optional motion interpolation feature, known as Action Smoothing. When you enable it you can add soap opera effect to the image, up to 60 frames per second.
The TCL Q825 has an optional black frame insertion feature, known as LED Motion Clarity. Enabling it results in less persistence blur, but causes noticeable duplications in motion.
The TCL Q825 is able to remove judder from all sources, without you having to adjust any setting.
This TV can enter game mode from any picture mode. When you start gaming, it should set Game Mode to 'On' to get the lowest possible input lag. Continue using the recommended settings for SDR or HDR. For HDR gaming, it's important to make sure that HDMI 2.0 is enabled for the input you are using.
When connected to supported gaming devices, including the Xbox One, the Q825 will automatically enter game mode when it detects a game is running, and it leaves game mode when the game stops.
The Q825 will automatically detect when it's connected to a PC, and will automatically enter PC mode. If it doesn't detect your PC, simply change the input icon to 'Computer'.
Some settings are only available via the Roku app, which you can download through the app stores on Android and iOS. In the Expert Picture Settings page, there are a few settings that you can adjust from both the TV and the app, such as the Picture Mode and Color Temperature, but Gamma and Noise Reduction are only available through the app. Gamma affects the brightness of images, and we normally set it at '2.2', but we used '2.0' for this TV. If you find it too dark, set it to a lower number, and if it's too bright, set it higher. Noise Reduction aims to improve the gradients at the cost of losing fine details, but we've noticed it doesn't do much on TCL TVs. You also have to calibrate the TV through the app by setting Color Space to 'Custom' and adjusting the 11 Pt WB values.
The following are the results of the white balance and colorspace calibration on our unit. They are provided for reference, and should not be copied as the calibration values vary per individual unit even for the same model and same size as the TV we reviewed due to manufacturing tolerances. If you want to try them you will need to enter all values shown, as all of them are active at the same time. If you end up with worse picture quality, simply reset them to the default values.