Yaskawa SGM7A Type Servo Motor Yaskawa SGM7A type servo motor Wuxi Trenty Machinery & Equipment Co., Ltd. , https://www.elec-inverter.com
The object of this evaluation is Hisense LED40EC520UA 40-inch smart 4K HDTV, which belongs to the lower end of Hisense and is priced at around RMB 2,000. Hardware, it is equipped with a 64-bit quad-core Cortex A53 CPU + Mali450 GPU + NEON quad-core co-processor, Android-based deep customization of the VIDAA3 operating system, these jerky specifications I will slowly explain in the later evaluation.
First, appearance 
As a low-end battery, the appearance of the EC520 is not very pleasing. The plastic housing and the bracket have a general texture. Only a silver metal strip at the bottom of the screen is more conspicuous. 
The indicator light and infrared receiver are located at the bottom left of the screen. There is no printing on the front except the Hisense trademark. The narrow frame and ultra-thin body are also not compatible with this low-end TV. However, from my personal point of view, the narrow border can also make the front of the TV more concise, the pursuit of ultra-thin body is a bit boring, and it is really not a few centimeters thick to hang on the wall. 
The back of the 40EC520 can see the standard TV hook-up interface, and there are a large number of cooling holes. 
These vents allow the TV to maintain a low temperature even after a long period of operation. The maximum temperature measured with a thermal imager is only 31 degrees, and the temperature of the ultra-thin TV is mostly much higher. 
The back of the TV provides AV, component, digital audio, network interface, HDMI and debug interface. I personally do not like this interface arrangement. When the wall is mounted, the cable will be severely curved on the top of the wall. A long time will easily lead to damage to the wire or even interface damage. However, the use of interfaces other than HDMI will be very low. Most of the peripherals are HDMI interfaces, and the network has WIFI support. 
Commonly used interfaces are all located on the side of the machine, including 2 HDMI interfaces, antennas, TF card slots, USB3.0 and 2 USB 2.0 interfaces, as well as SMART CARD slots.
Here I will focus on HDMI. Three HDMI interfaces are the first surprise for 40EC520. Of course, this is not to say that there are many HDMI interfaces, but three interface notes: 2.0, ARC, MHL. The 2.0 interface ensures that it supports 4K input without stress; with the special MHL cable connected to the phone's MicroUSB interface, the phone screen can be transmitted to the TV; while the ARC can send the audio signal back to the amplifier via the HDMI cable, if not, Then watching the online video with the built-in software of the system can't pass the sound to the power amplifier. There are not many low-end TVs that fully support these features. 
The fuselage control buttons are located behind the television, and the disc arrangement is easier to locate by tactile, but this has very few opportunities. 
The power outlet is also side-designed to prevent the end of the line from reaching the wall. 
The power switch is located in the small groove at the bottom of the TV. It can't be seen from the front and can only be touched by hand. However, the current TV standby power consumption is very small, there is no need to switch it. 
EC520 series of remote control is another advantage I love, it canceled the number keys, other keys are basically the same as traditional TV, the appearance is not as simple as a 11-key remote control such as the millet TV, but it also provides unmatched convenience Sexuality will be detailed later. 
The sleek and compact shape design, 2 No. 7 battery-powered, feels much more comfortable than the old long-range remote control.
Second, dismantling 
In the product specification, simple quad-core processors, 6-core GPUs, 4K screens and other parameters are difficult to satisfy my curiosity, so simply confirm yourself. 
The power board is very good workmanship, stronger than some of the international big brands that I had previously demolished. 
The main goal is still this motherboard. 
Remove the motherboard and heat sink to confirm the CPU model and peripheral conditions. 
40EC520 uses HiSilicon Hi3751V600 processor, unfortunately Hais official website does not provide its information, only provides Hi3751V700 data, I am not sure how much difference between the two will not be announced, from the online access to the data we can see: 4 ARM Cortcox A53 CPU core, 6 ARM Mali 450 and 2 VPU cores, built-in 16GB EMMC flash memory, and support for TF card expansion. 
The power amplifier uses the Texas Instruments TAS5711 20W integrated circuit, which is one of the most commonly used power amplifier chips for LCD TVs. 
The all-band speaker unit has a separate sealed cavity, with silicone shock absorber pads at both ends, and a sponge seal around the ring to ensure that it is cushioned with the housing, which provides a good sound quality for the speaker. 
Speaker supplier for Wuxi Jeff electroacoustic 
Judging from the liquid crystal component label, this is Hisense's own liquid crystal component. Of course, there is no LCD panel of its own, it is through the procurement of other home panels, their own shell and backlight to complete the liquid crystal components. 
This is the LCD driver board 
Judging from the chip on the driver board, the 40EC520 uses a Samsung LCD panel.
Third, the system
After confirming the hardware information, the following begins to introduce the TV system. The smart TV system determines the convenience of its operation. 
The VIDAA3 system used by the EC520 series is based on the Android 4.4.2 version. The current high-end model of Hisense has been upgraded to the VIDAA4 system based on Android 5.0. 
The VIDAA3 system works seamlessly with Hisense's remote control, which is much easier to operate than Xiaomi's 11-button remote control. For example, the top four color keys can directly enter the corresponding function module, which can be switched among functions such as cable TV, games, and applications. The overly simplified remote controller can only return to the total page first, and then select the module that you want to enter. . 
In the system settings, you can also set the function of the shortcut key and the default boot signal, which will also bring great convenience to the future use. 
For example, the first default live broadcast start button I set to HDMI input, and now cable must be equipped with a set-top box, broadcast has almost received no show. But here is still a side note, EC520 also supports DTMB terrestrial high-definition, as long as the purchase of a DTMB antenna can receive 1080i high-definition programs, but different signals are different, the open city is not a lot, you can check online whether the local opening. 
If you press the Enter key in any interface, a list of all function modules and input interfaces will pop up at the bottom of the screen. You do not need to go back to the initial page to find it. This is also the case with a remote control such as Hisense. From the figure above, we can see that there are live TV, video on demand, application center, media center, and sharing center in EC520's functional modules. 
Most of the people who don’t have a live broadcast now do not have much to say. Let’s talk about the most important video center. VIDAA3's film and television center sources are provided by Huada and Litchi TV. Huachen owns full licenses for interactive TV, mobile TV, and Internet TV, while Litchi TV is the most resourceful website, iQiyi and Yangguang Galaxy. This is also an alternative method that SARFT has mandated to prohibit the application of video sites to push TV APP. With the support of two major platforms, Huaji and iQiyi, Hisense's online video resources are very comprehensive. Of course, there are also charge items that need to be purchased to play, or wait for a period of time to become free. For example, when I first received the TV set, the descendants of the Sun were still charged after 5 episodes. Now it has become free. 
The game hall is a module of cooperation between Hisense and Tencent. It can download a large number of games. Like the mobile games, it also contains a number of charging items. 
The application center is of course the place where applications are downloaded. Although there are not many resources here, you can install them through the USB flash drive. There are all kinds of applications. 
The media center is more like a file manager. It is a module for playing and browsing files on removable hard disks, USB flash drives, and internal ROM. 
The measured format supported by the EC520 is comprehensive, and the latest H.265 high-rate chip sources can be played smoothly. 
The last sharing center is a function that pushes content on mobile phones, tablets, etc. to the TV. The actual usage rate should not be high. 
Found that the micro-channel TV function is not perfect, although the push video is very simple and easy to use, but the remote control function and the TV application management of these two modules often stuck and cause the application to stop responding.
Hisense LED40EC520UA smart 4K TV users can refer to the tutorial: Hisense TV EC520UA installation method Install a sofa housekeeper to achieve third-party application extensions.
In general, the VIDAA system works well with Hisense's remote control. The system responds quickly and smoothly, and switching between functional modules is very simple.
Fourth, the screen
The system reflects the convenience of the operation, and the screen determines the picture quality. Therefore, I did a lot of tests on the screen. 
The above picture shows the pixels under the pure white, red, green, and blue images taken with a macro lens. It can be clearly seen that this is a typical Samsung RGBW screen. 
This kind of screen can't reach the true 38402160 resolution effect, because the normal 4K screen should contain RGB three-color sub-pixels for each pixel, while RGBW only contains two sub-pixels for RG or BW, and the resolution will be slightly different. loss. The above figure shows the distribution of 4.5.4 digital pixels under macro conditions. Obviously, it can be seen that the handwriting is not very clear, in particular, the vertical line details are lost. However, its definition is still much higher than 1080p. 
Compared with a TV with a 50-inch RGB standard pixel distribution, the brightness of the EC520 is slightly higher on the white screen, and the brightness of the EC520 is significantly lower on the red, green, and blue solid colors because of the panel's differentiation. The 1/4 area comes out to the white pixel. In the RGB solid color screen, the white pixel point is not light, so the brightness will be somewhat lost. But conversely, if you adjust the brightness of the RGB solid color to be consistent with the RGB screen, the white brightness will be more prominent. This is also the original intention of the RGBW screen design: providing higher brightness, achieving greater contrast, sacrificing a little color, and displaying More picture details. 
A black screen under a one-second long exposure, both TVs have slight light leakage, but they have no effect during normal viewing. 
Both TVs play 4K demo photos at the same time. The color temperature of EC520 is slightly higher and the screen looks brighter. 
I photographed the location of the bell tower at the top of the minaret of the two TVs in a macro, and actually the RGBW screen's EC520 photo details are more than the RGB true 4K screen. It can be seen that the built-in viewing software for this 50-inch TV does not support 4K resolution and is processed to 1080p. The VIDAA3 system optimization is more comprehensive. 
Let's take a look at this TV's perspective. This is a front-shot photo. 
Shooting from the side, in fact, this tilt angle is not large, but it is clear that the clouds on the right side of the screen are already yellow. The viewing angle of this RGBW screen is slightly disappointing, and the actual use is still sitting in front of the TV as much as possible.
Here are a few simple comparison photos. The color preferences are very subjective and subjective, and do not comment too much. 
Five, school color
People who have a high demand for television usually choose the preferred mode or calibrate after they get the TV in order to make the TV more effective. 
The 40EC520 offers 5 color modes and custom functions. There are 5 color temperatures and brightness, contrast, chroma, and sharpness adjustments. Here also reflects another practicality of Hisense remote control, when you play the video, you can directly call up the menu to modify the settings. 
I calibrated the brightness and contrast of the 40EC520 with a dedicated school color video. The left side is the default setting and the right side is the calibrated effect. 
This is the calibrated parameter, the default is 50, visible 40EC520 initial data is quite accurate. But it has fewer calibration items, and it also affects further adjustments. For example, brightness is not clearly indicated as backlight brightness or screen brightness. Normally, the television will have hue and saturation. I am also not sure what the hue is and adjust. After the color did not change.
Here I want to go back to the remote control to mention this humanized design, tune TV needs dedicated video, like Hisense can play the video while calling out the adjustment menu before it is convenient to operate, the simplified remote control will adjust each number to be back To the initial page, enter the settings adjustment, and then come back to play the video, this workload is almost shudder.
Sixth, summary
This Hisense LED40EC520UA left me a good impression. Although its resolution is slightly lower than the RGB 4K screen, the relative 1080p screen has been greatly improved. The overall image quality is still satisfactory for this price point. What impresses me most is the adaptation of the system and the remote control, which makes the operation very simple. The disadvantage is that the pixel arrangement is not suitable for the computer to display the text. The small viewing angle is not suitable for too many people to watch together. It should be a good choice to use it in the study and bedroom.
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