Guide to purchasing second-hand laptops

Base color --- Glossary

For a long time, we have been asking about the base quality. Looking at the inspection machine steps of the base, we can see the concept of base quality. The following are our views on the base quality control, on behalf of the accumulated experience in this forum on machine quality testing, there are deficiencies in the hope that the National netizens will give criticism, so that consumers can understand and buy at ease.

■ Detailed description of base quality:

Base color:

1. There are no black spots or white spots on the side of the screen, the screen background color is even, the color should be pure, look comfortable, and the white screen should be pure white (not pure white, also divided into warm and cold colors, looking at your personal preferences for colors, we generally recommend cold tones, but do not recommend cold-to-green tones.) When the Nokia software is switched to various color screens, there is no LCD screen dead or bright spots, screen color does not occur, light leakage, screen film without scratches, screen film without stains and dust, the screen gently pressed not like a large area of water ripple wrinkles;
2. The serial numbers of the motherboard are the same as those of the serial numbers at the bottom (type and S/N) and MAC addresses are the same (this is an important indicator to identify whether serial numbers have been flushed, this issue has not been taken into consideration in general practice, so I am worried that this article will be viewed by fake experts );
3. ABCD shell clean (a-top cover, B-is a screen frame, C-palm holder, D-bottom shell, ABCD shell is industry terminology ), there are no obvious scratches or bumps (there is no trace at all, that is, the new machine), and there is no renovation (as shown in the paint renovation );
4. The keyboard feels better and can have a little brightness. This ensures that the keyboard is completely original (sometimes the refresh keyboard technology is superb). Of course, the smaller the brightness of the Base, the better, or sometimes the original brand new keyboard will also appear on the base machine, the keyboard to identify the need to see the white text under the black watermark film is very clear and clean ;,
5. The hard disk must be tested in mhdd without any red dot, which is a healthy hard disk. The sound must be too small, with no noise, even speed, and normal fever (the hard disk may sound or heat up, after all, it is not a new mute hard drive );
6. The screen axis should be tight enough. Of course, there is no need to bring the screen up with one hand, and the angle of the machine remains unchanged (that is the harsh standard of 51nb master door). You can feel that the screen axis is very tight, when it is too tight, it is not very good to hear Kaka;
7. Parallel Port, serial port, print port, USB port, and PCMCIA port must ensure that the needle port is in good condition, without damage, without leakage, and has good performance, this professional interface is very difficult to break, the base does not detect, the customer detects it, free repair at any time );
8. When the battery test software is installed, the battery must be green for more than 30. Some batteries with yellow 35 or above are also good, and the battery is usually replaced by the battery core, it takes a long time to use it within three months and degrades quickly over time. Sometimes the test software may not be accurate. It is best to * test the battery standby time.
9. The Optical Drive requires VCD reading. The sound of the DVD is small and the rotation is normal. There is no drive sound. It is fast during automatic playback in the system and pulled in the progress bar of the playback software, no image pauses or mosaic;
10. The temperature of the whole machine will be normal after 1 hour of operation, unless T30 is relatively hot, the temperature of other IBM machines must be warm and cannot reach 60-70 degrees or above (the temperature should be considered in summer, will be hot), the fan turns quietly and evenly;
11. When the system is slow, the hardware cannot be identified. That is, a hardware fault exists in the machine. If the blue screen of the system is completed, the hardware of the machine fails. Generally, the memory is considered, bad hard drive channels, South Bridge, North Bridge; more than 20 scroll bars cannot be entered into the system scroll bar. Generally, 7-10 are normal. 3-7 scroll bars indicate that the machine is in good status;
12. When a video card runs 3dmark, it does not display a screen. Some video cards only display a screen in DOS state, but are normal in Windows state, run the local test video card and run the 3dmark command to check whether the video card is good or bad. Of course, the battery mode and power mode are also used. Sometimes, other abnormal modes in a single mode are also faulty;
13. In some professional software tests, if a machine's hardware cannot identify the FRU number and the factory time, the hardware has been replaced. Of course, for two hands, it is hard to meet the original 100%, it is also important to consider whether the hardware running status is good or bad (the base does not accept the machine that replaces the motherboard );
14. There are few machines without any screw on the bottom of the screw, but there are serious traces of screw wring. It is certainly not a professional's rough hand, making the machine difficult to ensure stability;
15. The sound card test is generally a self-generated system. When the speaker is switched off, it is required to test whether the sound is consistent with the sound size, and whether the sound is broken in the most tweeting case;

 

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