look

1. Look at the monitor model.

Try to buy monitors from Sony, Mitsubishi, ibm, Dell, Hewlett-Packard, eizo, sun, sgi and other well-known brands. As we all know, although only Sony and Mitsubishi (Taililong and Diamondtron) can produce high-end picture tubes, there are OEM products of these two companies in many well-known display brands, such as Sony's g500 monitor.

2. Look at the product appearance and production date.

The appearance should not be too shabby, otherwise the purchase value will be lost. Of course, don't pursue the old and new shells too much. The back of the display should have information such as trademark and serial number, among which the most important is the production date of the display.

If we want to know the parameters and information of a monitor, we can learn from the nameplate of the monitor. Under normal circumstances, the nameplate is attached to the back of the color display cabinet, which is printed with the production date, model, voltage, performance and origin of the display ... but js will tear off the nameplate or scrape off the date and other values that can be judged by the naked eye to deceive users. For js, we can distinguish it according to different models. For Sony,

For Dell's second-hand monitor, we can press the meu menu button for about 5 seconds, which will bring up the bios information inside the monitor, from which we can also see the production date, model, voltage, performance, serial number and other parameters. If this method fails, we can also read this information through software such as powerstrip and aida32.

two

measure

Testing of second-hand monitors

The appearance can be slightly accommodated, but the display effect should not be sloppy at all, otherwise it will violate our original intention of buying second-hand monitors. For monitors of different sizes, it is necessary to test them according to different resolutions. 17 inch is 1024*768, 19 inch is 1280* 1024, and 2 1 inch is/kloc. Of course, it's not a bad thing for you to take a look at the monitor of 2048* 1536 in the end.

We still recommend Nokia as the test software for monitors.

Testing should usually be provided by the second-hand monitor supplier. If he says no, be careful. It's probably because he didn't want to expose the problem of this monitor to you, so a qualified friend copied one with him on a USB flash drive.

Key point: this is the place we need to pay attention to most. Generally, second-hand monitors that have been used for too long or refurbished will not have a good focusing effect.

The focused screen looks like this. You can compare the clarity of the text displayed in the middle and four corners of the monitor. Generally speaking, all crt monitors are not as good as the focus effect in the middle of the screen, which means that the text displayed in the four corners will be slightly blurred. However, if you find that the font in a corner is particularly blurred and cannot be adjusted, you should pay attention, because this is probably an aging CRT.

Besides focusing, we should also pay attention to the convergence effect. Convergence can be divided into transverse convergence and longitudinal convergence, which can generally be adjusted separately. Using the effect diagram in the test software, we can easily see whether there is convergence problem in the display. Intuitively, a display with poor convergence will have weak red or yellow edges when displaying images (especially text files). Some monitors can adjust convergence, and you can try to adjust them when you buy them.

There are still some problems that need to be paid attention to when buying second-hand monitors, including: geometric distortion of corners, moire fringes of monitors, temperature drift, respiratory effects and so on. But these are relatively less demanding, as long as the effect is acceptable.