Crystal manufacturers exclusive blasting crystal repair coup
Many people will ask why the crystal oscillator on a computer motherboard can play a role. The general motherboard contains at least 2-3 quartz crystals, or even more. The most indispensable part of the computer motherboard is a cylindrical crystal. People in the industry who are in contact with the crystal oscillator are very puzzled. They do not know what this crystal oscillator is for. In fact, the most common frequency of cylindrical crystal is 32.768KHZ. People in the industry are popularly known as tuning fork crystals or crystals. Quartz crystal used on the clock, 32.768K is the most common on the digital circuit board, do the tuning fork crystal oscillator often used by the clock customer.
For example: what effect does the crystal on the laptop motherboard play, is it the frequency of oscillations? The crystal oscillator is called the crystal oscillator. Its function is to generate the original clock frequency. After this frequency is amplified or reduced by the frequency generator, it becomes a variety of different bus frequencies in the computer.
However, quartz crystal oscillators used in computer motherboards are also called active crystal oscillators. According to the polarity, they can be further classified into passive crystal oscillators.
The most commonly used crystal oscillator on the motherboard can be classified as 5, and the following ones should clarify their role.
1,14.318M crystal oscillator for the clock, working voltage is 1.1-1.6V.
2. The 24M crystal oscillator provides the relevant operating clock for the internal VGA section of the BGA.
3, 24.576M crystal for audio chip, working voltage is 1.1-2.2V.
4. The 25M crystal oscillator is used in the network card part to provide the operating clock for the network card and also used for the clock needed in the power-up sequence of the Nvidia chip, and the voltage is 1.1-2.2V.
5, 32.768KHZ crystal oscillator is a real-time crystal oscillator, the working voltage is about 1.4V, the system time reference clock, before the power supply to provide the work required clock inside the South Bridge.
The most common crystals of tuning fork crystals are 3*9mm, 3*10mm, 3*8mm, 2*6mm, 1*5mm, 1*4mm.
Under the current trend of development of electronic products, many products will use quartz crystal oscillators, but the use of ceramic crystal oscillators is decreasing. Division I for the current market prospects, meticulous research, which has the following reasons: 1, quartz crystal high precision and high temperature range than the ceramic crystal is better, and the ceramic crystal precision is often less than expected results, So on the verge of being eliminated by the follow-up market. 2, ordinary quartz plug-in crystal oscillator price is not as high as before, to achieve a high price for better quality, low prices and excellent quality to stabilize the market, and the impact of ceramic crystal market. Quartz crystal professional crystal manufacturer Jin Luo Electronics, is your closest choice.
About the damage of the crystal oscillator (after the customer received the goods, the crystal oscillator was broken after the assembly, and the technical department of our company came to the conclusion above)
1,14.318M: Can not afford vibration, will affect the board after power on the board without reset, start-up waveform is not normal, may directly lead to the motherboard boot time out of the phenomenon. Give an example: a motherboard that has been put back by testers many times, the cause of the fault is set to not boot. After the confirmation, the board is unstable, most of the time can boot, and sometimes not boot, but not the whole board without reset (14.318M does not start), replace the crystal oscillator and return to normal. {This is a crystal oscillation instability}.
2. When 25M crystal oscillator is used for NVIDIA power sequencing, 25M does not affect the power supply, or power-off or power-off, and unilateral start-up also causes power-off and power-off. When 25M is used for a network card chip, if it fails to vibrate, it will fail to catch the network card. If the frequency is abnormal, the network will not be connected or the network light will not turn on. To give an example: a NF520T motherboard, can not grab the network card, measuring 25M crystal oscillator both ends, found no voltage waveform, replace the crystal, the fault disappears. A colorful CN61G 1.5B motherboard, the phenomenon of failure is not turned on the digital card FF, carried out two or three maintenance measurements were found no problem, and this board is a short-term board, and for BGA, the tone can not be repaired, placed on the station . After plugging in the power for the fourth time, the power was turned off and suddenly wakes up. The amount of 25M does not start and the replacement is OK.
3, 32.768KHZ crystal oscillator cycle error, will directly affect the accuracy of the motherboard system clock, there will be a problem of the clock is not accurate, this time with the mobile phone time is not a reason.
For motherboards with tel/'target='_blank'>INTEL, AMD, and ATI chips, the 32.768KHZ crystal oscillator does not start up, causing the board to not power up or reset the board after power-on. For the NVIDIA chipset, the 32.768KHZ crystal oscillator does not start up and the CF or 45 (corresponding digital card) will appear. The digital card runs FF{There may be an I/O (winbond83627) in pin 18 or pin 21. A clockless}. To give an example: boot the digital card to run 45, the amount of 32.768KHZ does not start vibration, with diodes to measure even the resistance of the section of the low resistance of the crystal is low, and the two resistance is similar, and the two sides of the crystal oscillator OK 670 Euros, 775 Euros (It is not necessary to remember the resistance during maintenance, but refer to the OK Board when it is not accurate).
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