I. Procurement and Inspection of Machines
1, look carefully at the screen for marks; Whether there is dust on the data cable, earphone hole, speaker hole, hanging hole, etc.
2. Look carefully at whether there are dial marks at the battery lock of the fuselage and whether there are rotation marks at the rotating shaft of the upper and lower covers.
3. Carefully check whether there are records in WAP, voice function and call record information function.
4, smell, the new machine has a special sandalwood smell, which will not dissipate in a short time after purchase. This smell is different from ordinary detergent and perfume, and it is also different from the smell of plastic or chemicals (PS: check the fuselage carefully to see if there is wax and oil stains, and the nails are slightly scratched. If there is, it is beautified by the merchants).
5. Carefully check the contact point between the SIM card and the battery of the fuselage to see if there are any wear marks and whether the new machine has frosted light.
6. Check whether the gap at the joint of the shell is even and small, whether there are pry marks, and whether there are pry marks at the two sealing points under the screen in the upper cover.
7. The buttons of the new machine are very elastic, and the feedback of the physical keys is very strong, but the left volume button is only slightly loose or not.
8. Carefully look at whether there are rotary printing, friction marks, paint and ink (magnifying glass can be used) on the fixed gong nail of the fuselage, and whether there are pry marks and scratches on the trademark.
9. See if there are any scratches on the film. The new machines are all laminated, and there will never be bubbles in the original film. Although JS's film technology may be very high, it must be checked.
10, the overall appearance is coordinated, and the shell is bright without any scratches.
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Second, the factory date query method
Enter the dial-up input *# 197328640# and enter the engineering mode;
Click the menu key, and then click Enter to enter the value 2;
Then click the menu key to enter the value 2;
Then click the menu key to enter the value of 4;
You can see the calibration date: it shows the production date.
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Third, look at the call time.
Enter the dial input * # * # 4636 # * * to see if the call time is extremely short. Theoretically, it shouldn't.
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Fourth, test whether to lock three keys.
1, press the HOM key under the volume, and the animation of robot coal mining can appear.
2. Press the volume button to enter the recovery mode.
The above appear at the same time, that is, three keys to unlock.
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Verb (short for verb) tests whether there is a network lock.
1, enter the dial-up input *#7465625# to see if the machine is locked, and it is all closed normally.
If the value of the second item "Network Lock" is "Disabled", it means that there is no network lock, and the value of "Enabled" means that there is a lock.
2. Check the version and enter *# 1234#. If it is displayed as PDA: I 900dzhg1/dzhg1.
Mobile phone: Samsung i9000NSPRO, it fell and locked.
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Sixth, identify the origin of the mobile phone.
Enter the dialing input: *# 1546792*#, then enter the engineering mode and select the pre-configuration. At this time, you will be prompted to enter the password, enter: *#8 1230*#, and then confirm that if JS does not change the "Select a country" column, the origin of the mobile phone will be displayed, so that you can tell whether it is a Hong Kong version or a European version.
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Seven, screen detection:
Enter the dial-up input *#0*#, engineering test, buy the machine will test:
The first line of the tricolor test
The second line 1 sound 2 vibration 3 brightness drops.
Third Row 1 Camera 2 Magnetic Sensor 3 Touch Screen
Line 4 1 Sleep Mode 2 Gravity Sensing
There is a "liquid crystal test" in it. Press "Red" to display red, press "Green" to display green and press "Blue" to display blue. If you want to return to the test menu, please press the Enter key in the middle to exit and press the Hang Up key.
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Eight, IMEI code test
Enter the dialing number *#06#, check the IMEI code of the mobile phone, write down the number, and then enter *2767*3855# to reset the i9000 chip, and the mobile phone will automatically restart. It doesn't matter if the new machine is reset
Then dial *#06# to see if this IMEI code has changed. If this number is posted on the back of the mobile phone (sometimes the IMEI code on the outer packaging box is consistent, sometimes it is inconsistent, and the outer packaging changes greatly, so it is a parallel product), it will prove to be the original product. If it is inconsistent, or becomes a string of garbled codes, it proves that there is something wrong with the mobile phone, and it will pass.
PS: If the instruction is not executed, it means that the chip reset function has been blocked by JS. Remember, this operation is equivalent to hard starting the mobile phone, but it doesn't matter whether it is brand new or not.
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Nine, battery knowledge
1 for battery and mobile phone, serial number: 123-ABCD-EF-GH, and ABCD is year, month and day respectively. S stands for 09, Z stands for 10 and B stands for 1 1.
2. What's inside the positive and negative poles of the battery-inside the circle, there is no intersection with the circle. The point to the right of the positive electrode is concave.
3. Identification and maintenance of original batteries:
A, the first misunderstanding about the authenticity of the original electricity: don't get entangled in the battery case sticker. The technical threshold for improving the process of battery case sticker is not high, and the quality of packaging paper is better. Professional typing can make neat fonts. Therefore, it is difficult to distinguish the authenticity of the battery from the shell sticker without the help of professional instruments.
B. Identify the authenticity of the battery through the system information: enter the dial-in number *#0228#, and in the battery information, you can see that the original voltage and battery temperature fluctuate with the use of the battery and the increase or decrease of the power. It is very important that the voltage of non-original battery is always a fixed value, and the temperature fluctuates slightly between 24 degrees Celsius and 24.9 degrees Celsius. Analog and commercial IC chips are useless, and do not have the functions of temperature test and accurate display of electric quantity, which is the biggest difference between the original battery and other batteries.
C. If your mobile phone battery is used anyway, the temperature keeps showing 24.5 degrees, and the back cover of the mobile phone starts to heat up. If the battery voltage of your mobile phone keeps showing 3923Mv regardless of the percentage of power failure, congratulations on winning the lottery. It is very likely that your battery is not the original battery or the battery is dead. Android phone battery details view
4. Regarding the problem that the charging amount is less than 100%, many methods can distinguish the true and false original electricity by whether the engine oil can be filled up to 100%. This is also a misunderstanding. In fact, the charging of genuine batteries is really less than 100%, and at most 99% or even only 97% is normal. This is because the control circuit of the IC chip in the battery is working to prevent the battery from being overcharged, such as overpressure, high temperature, expansion and damage. Fake primary batteries can be easily charged to 100%, because most of them are rough and simple, with only electric plates and no ic chips. If you continue to overcharge, the battery may swell, the mobile phone motherboard may be damaged by overpressure, and even explode.
PS 1: Many fake explosion-proof holes are fake, so the internal pressure cannot be adjusted.
PS2: At present, the quality of a few brands of batteries can reach the level of original batteries, and some are even better. This is generally not the case.
5. About the maintenance method of the original battery: First of all, don't fully charge the battery every time before using the battery for automatic shutdown and charging. This will cause great loss to the battery, which is what we often call overcharge and overcharge. If you can't charge the lithium battery every time you use it, it is likely to damage the battery due to excessive discharge in the long run, especially in winter. Lithium batteries have no memory effect and do not need long-term charging and discharging. If the stored power drops and the charging time is shortened, it is often caused by errors in the data records of IC chips in lithium batteries. At this time, as long as the battery is corrected, the power can be restored. I shared it with you last time: You can take a closer look at the 2 1 setting skills of saving battery power for Android phones. I always charge in real time, and plug in the USB interface if nothing happens. Theoretically, lithium batteries can be charged and discharged thousands of times. If the charge and discharge times are more, the thermal movement of molecules will gradually destroy the microstructure of their internal molecular arrangement, and the efficiency of charge storage will gradually decrease. Once the microstructure in the battery is destroyed, it is impossible to completely recover. Therefore, the best maintenance method of battery is to keep the charge of lithium battery between 80% and 90% as far as possible, and the battery voltage should be kept close to full charge but below 4200 millivolts, so as to keep the storage small molecule structure in a stable state.