Consult a professional, if you want to learn computer motherboard maintenance, what are the prospect

Electronic circuits do not understand it is not recommended to learn, to learn at least your high school and college have learned, the prospects for electronic product maintenance must be getting worse and worse, a little hands-on ability, will also buy a spare parts online to repair themselves, with the elimination of the age level, the old man and the old lady sent the machine to you to repair less and less, so the prospect is not optimistic.

And the real maintenance is two concepts, for example: the computer does not light up, know that it is a graphics card problem, according to your original way of working is to change the graphics card, make a difference.

Repair: It is to repair the graphics card.

Reality: It may cost 50-100 yuan to repair a graphics card, and it costs 200 to buy a bad graphics card with better performance than the current one. If e-commerce is not developed now, it can be said that maintenance is profitable, and it can also be earned by replacing hardware alone.

Of course, there are also those that make money, for example: 9800GT

The common problem is that there is basically no cost to repair, and many 40-50 are collected and 200-300 are sold.

That's how it earns. But no cost requires expertise to make up for it.

Now the second-hand motherboard is too cheap, and it is good to repair it in general, and there is no need to spend a lot of time on the motherboard that is very laborious, mainly because the profit is low now.

Electronic products are replaced quickly, especially computers. Since you don't have a foundation in electronic circuits, don't focus on fixing motherboards. 2Hand accessories are very cheap, and if you want to learn, the investment is not proportional to the return.

For example, if my computer motherboard is broken, and I take it to you to repair it, if it only takes 100 to replace it, then how much do you want to charge me? That's the basics.

If you are interested, you should study seriously.

Computer motherboards generally don't have any problems in four or five years, repair this or forget it, it is recommended to repair all digital products, computers, mobile phones, tablets, TVs, these are now a type.

It's not easy to repair, and you have to have some high-level maintenance equipment.

Repair methods for common faults of plates.

Maintenance steps: Observe whether there is an obvious short circuit on the motherboard.

Power on and touch the chips of the motherboard Whether it is seriously heated or cold.

Beat good line, voltage, external frequency, frequency doubling.

Power-on detection Whether the power supply is normal or not.

Plug in the observation digital card, if there is no beating, first check the three major conditions of work, and measure the waveform of the line under the premise that the three conditions are met.

or no wave: South Bridge, North Bridge, Line Section.

There are no waves: mainly check the working conditions of the South Bridge and the North Bridge and themselves.

No waves: South Bridge, partial.

No waves: The fault range can only be found by the method of quantity to ground resistance.

There is a little wave, but it is still displayed, and the fault range can be determined by the waveform method and resistance method.

Motherboards are fragile components.

Power supply: MOSFET, power drive

Chips, north-south bridges,

The capacitance of the large filter capacitor is reduced, and the leakage current is scorched.

Resistors, capacitors, etc. Crystal oscillator, 74 series gate circuit. Battery.

Diode, transistor, small inductor, fuse, serial chip, small row resistance.

A simple way to judge the quality of the motherboard chip:

Measured resistance. Measurement with clock input, no clock input (chip bad).

The Northbridge chip was damaged and bulged up a little more.

Short-circuits to ground are mostly faults, chips, clock generators, and power supplies.

Data busy signal): dismantle and plug in the three conditions are met), no wave, the north bridge is bad.

Most of the faults of the new board are: power supply, partial, and most of the faults of the old board are: Nanqiao (BIOS, IO.

Example of detection of digital cards:

07—09 Crash; 08—09 Memory problems The motherboard other than the memory module is not turned on;

01-11 are all related to memory; There is a problem with the graphics card; u1—u6 does not read memory c1 and c6;

05—07 There is a problem with the keyboard; 4b is displayed; B9 In addition to the bus, there is also a possibility of a northbridge, and there is a problem with the memory.

b. 5 There is a problem with the memory (the northbridge part); Boot up, but don't read memory, don't boot before;

Shows a partial short circuit; Chabei Bridge section; ０７

There is a failure that is displayed on the screen prompt:

Wrong CPU frequency: Check the jumper, settings, clock frequency, etc.

The hard disk is controlled incorrectly or the hard disk is not read: 1. Check the reset signal on the hard disk interface or the ground resistance value of each pin of the IDE. 2. Check the 244, 245 or exclusion associated with the IDE. 3. South Bridge.

The floppy drive does not read or reports an error: 1. Check the ground resistance value of the floppy drive interface. 2, IO chip 3, South Bridge.

or IO chip or inside the south bridge.

COM port does not work: 75232 +-12V, IO chip, or chip power supply.

Parallel port has no effect: check the IO chip, and the south bridge.

The COM port and parallel port can also be checked by the Check IT software.

PS-2 mouse no role: power feet i o and nan.

It depends on the damage.

1. Regardless of the damage, as long as it is not intentionally damaged during the warranty period, it can be warranted by after-sales;

2. After the warranty period is exceeded, you can choose a general repair shop for maintenance.

Repair recommendations for different damaged areas.

1. The chip of Nanbaiqiao is damaged. This is the main chipset of the motherboard, and it is generally not recommended to repair it, because it is easy to be unstable after repair, and the repair is large;

2. The network card, temporarily unused slots, capacitors and other parts are damaged. It can be repaired, and if the motherboard is still in use, it may not be repaired. The network card can be replaced with a stand-alone network card, and the capacitor can be replaced.

Be careful when it comes to repairs.

First, the market prospects:

With the continuous promotion of computers, the number of Internet cafes in urban and rural areas is increasing every year to meet people's demand for network information. According to incomplete statistics, a county town with a population of 200,000 has as many as 5,000 computers, of which more than half are purchased by Internet cafes.

But the keyboard, mouse, and headphones of the computer are the most vulnerable accessories. Once a computer accessory that has expired its warranty period is damaged, most Internet cafes will dispose of it as scrap or throw it away. If you can introduce the computer parts to the Internet café in time, they can be repaired, and the repaired parts will have the same effect as the newly purchased accessories.

In this way, the Internet café not only saves costs, but also increases the income of maintenance personnel. At present, there are very few people who only do professional maintenance of Internet café accessories.

2. Investment costs:

1. There is no need to open a store, use the computer of the Internet café to provide direct maintenance services. Buy maintenance tools, soldering iron, a set of various screwdrivers, and a special multimeter for a total of 100 yuan.

2. Open a professional store and operate computer accessories, online game point cards, etc. The shop is 10 square meters - 20 square meters, and a computer (if the funds are insufficient, you can consider buying a second-hand computer for 800 yuan - 1500 yuan). 1-2 glass counters for computer keyboards, mice, headphones, online game cards, etc.

In addition, an electric soldering iron, a special multimeter, and a set of screwdrivers of various specifications are required. The total investment is about 2,000 yuan - 4,000 yuan. sr

3. If the economic conditions are sufficient, a printer vacuum perfusion equipment can be added. This device can be used to vacuum fill the empty ink cartridges of the printer user. It saves costs for printer users and increases the income of maintenance personnel.

3. Benefit analysis:

A county town with a population of 200,000 conservatively calculates that there are 5,000 computers and a total of 15,000 accessories for keyboards, mice, and headphones. The warranty period for newly purchased computer accessories is generally three months. These 15,000 accessories will be damaged in a year's time, especially in frequently used Internet cafes, and the monthly damage rate of computer accessories is as high as more than 70%.

Repair a computer accessories, charge 3 yuan - 5 yuan, warranty period 3 months. If you take a month to take over the computer accessories business of Internet cafes, schools, typing shops, banks, government agencies and individuals in the county and repair these 15,000 accessories, the income can reach at least 20,000 yuan a year. And the parts can be repaired repeatedly, so that the maintenance personnel can continue to have business.

This is indeed an ideal project to get rich for an investor who has little start-up capital, especially for laid-off workers.

Fourth, maintenance learning objects:

Although computer accessories are high-tech products, as long as they have junior high school education or above, it generally only takes 10-15 days to fully learn maintenance technology. It takes 15-30 days to learn the education level below junior high school.

Not good, this line is not good, at most blocks.

First of all, you need to understand the most basic knowledge of electronic components, such as resistors, capacitors, diodes, transistors, field effect transistors, gate circuits, etc.

Then you have to analyze the major working circuits of the motherboard, such as the boot circuit, reset circuit, power supply circuit, and trigger circuit! CMOS circuits, clock circuits, BIOS circuits, etc., and then consider the whole machine maintenance! Only by making these circuit principles clear that no matter what faults you encounter, you can give them a trip!

1. The main components of the motherboard and the bus architecture diagram.

2. The main functional circuits and functions of the motherboard.

3. Definition of power supply pins and current direction.

4. Look at the circuit diagram to explain the essentials.

5. The principle and maintenance method of the standby voltage generation circuit of the motherboard.

6. The principle and maintenance method of the CMOS circuit of the motherboard.

7. The working principle and maintenance ideas of the motherboard trigger circuit.

8. The power supply circuit mechanism of the motherboard.

A: CPU unit power supply circuit.

b: Memory unit power supply circuit.

c: Power supply circuit of the graphics card unit.

d: Bridge power supply circuit.

9. Analysis of the working principle and maintenance ideas of the motherboard clock circuit.

10. Analysis of the working principle and maintenance ideas of the motherboard reset circuit 11. Analysis of the working principle and maintenance ideas of the BIOS circuit.

12. Workflow steps and fault judgment analysis of the whole machine.

13. Analysis of interface circuit principle, troubleshooting and maintenance ideas.

14. The maintenance process of the client.

15. Failure maintenance examples.

16. Summary of knowledge points of motherboard maintenance course.

The prospects for both industries are good, motherboard repair and carpentry. In the future, if you want to be your own boss with pants, learn motherboard maintenance. Because there are no prospects for part-time jobs in this industry.

Because education is a big bottleneck in training and renting, it is difficult for large companies to enter, and most of them are just eating in some maintenance shops. Therefore, the career prospect in this industry is to be the owner and open a repair shop. (Of course, there are also very good mixes, and I'll just say most of them here.)

Now there are very few simple carpentry, to adapt to the market, now generally carpentry as the basic skill, upgrade to decorator, should be the expansion of carpentry. This industry is relatively flexible, you can do it yourself, or you can work for others, and the income is relatively stable and relatively high. With experience, in the study of design, the development prospect is relatively large!

However, there are also disadvantages, that is, this industry is relatively hard.

Think about it yourself, I think if you learn technology, it is recommended to learn refrigeration maintenance, and now there is a big gap in this industry. The job is easy to find and not very hard.