쉽게 찾기 힘든 컴퓨터 고장 증상 (Computer failure symptoms that are difficult to find easily find out)

됐다가 안됐다가 지 마음대로 증상이 나오는 컴퓨터입니다. 가끔은 잘 되지만, 또 가끔은 잘 안되고 지 혼자서 난리입니다.

CPU 소켓 핀 중에 핀 하나가 쏟았네요.

 

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기가바이트 Z370 AORUS Gaming3 CPU LED 켜지고 꺼지고 반복

 

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Gigabyte Z370 AORUS Gaming3 CPU LED is on, off, and repeatedly stocked with symptoms. The CPU LED turns on, off, and repeats may not always be a defect as shown below. Please refer to it as a repair case.

 

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The MSI motherboard is called Easy Debug, the ASUS motherboard is called Q-LED, and the Gigabyte is called Status LED. The name of the main board is slightly different, but the function seems to be similar. Which process causes problems? It's an auxiliary means of identifying this. It is a reference LED, and it is actually correct to cross the suspected accessory.

 

There's a translation that says Gigabyte is an onboard LED.

 

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(Excerpt from the Korean manual)

 

1-8 Onboard LEDs and buttons

 

CPU/VGA/DRAM/BOOT(상태 LED)

 

The status LED indicates that the CPU, graphics card, memory, and operating system are functioning correctly after the system is powered on. When the CPU/VGA/DRAM LED is on, it means that the device is not functioning properly, and when the BOOT LED is on, it indicates that it has not yet entered the operating system.

 

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CPU: CPU Status LED

 

VGA: Graphics Card Status LED

 

DRAM: Memory Status LED

 

BOOT: Operating System Status LED

 

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The English manual says Status LEDs.

 

(Excerpt from English manual)

 

24) CPU/VGA/DRAM/BOOT (Status LEDs)

 

The status LEDs show whether the CPU, graphics card, memory, and operating system are working properly after system power-on. If the CPU/VGA/DRAM LED is on, that means the corresponding device is not working normally; if the BOOT LED is on, that means you haven't entered the operating system yet.

 

When it was first stocked, the CPU LED was turned on and off repeatedly as above. I remember that the beep code did not occur when the memory was removed. When I replaced it with my test memory, the motherboard setup screen came in. A customer who was watching next to me asked, "Is the memory a problem?"

 

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It's only turned on once with my memory installed, but I don't know what's wrong yet. Now that it's only turned on once, it needs to be checked to see if it can boot even if the customer's memory is installed again. Reinstalling the customer's memory fails to boot, and the same symptoms occur when my other memory "Samsung, Small and Medium Business" 4 gigabytes and 8 gigabytes are plugged back in by type.

 

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As a result of the interim check, this computer is a computer that has no fixed defect pattern (random error) that is difficult to repair and take right away, and needs to be checked in and out of the case. The next customer brought a computer in between 10 and 20 minutes to check with you, so you were waiting. It's hard to repair while watching the repair process through. Because it takes a long time to check. The next customer has to wait until the repair is completed, so it's hard to proceed with the work. Computers that take a long time to check (disassembly check) will be checked after warehousing and will contact you if we find the cause.

 

 

 

 

 

 

Go to CPU, DRAM, VGA, BOOT and the screen will come on.

 

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Immediate repairs and simple parts sales are handled immediately, and motherboard disassembly repairs that require inspection time are checked in the order in which they are received. Computers that do not show symptoms often cannot be repaired on the same day. Computers with hidden symptoms = Computers that work well in the computer store can be difficult to register. (It's because there are cases where I'm asymptomatic even if I use it for several hours. It is recommended to wear it when symptoms appear more often or when periodic symptoms appear.)

 

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After disassembling the main board from the computer case, check it, and if you find out which part is defective, we will let you know the symptoms and expenses by text message. Please check the inspection details and repair cost by text and let me know if you want to repair it or not.

 

Since my memory is also not working, it is estimated that the customer's memory is not defective, but while checking the motherboard and CPU, the "memory card" was tested separately. Memory check time is 30 to 40 minutes per 8-gigabyte memory. (See photo below)

 

 

 

 

It's a process that's passing one by one. I'm only watching one cycle. Sometimes the program does not detect it. You can't filter it out 100%. However, almost 90% or more of the defects are filtered out, so the test is conducted with the program. A lot of defective memory is usually detected in less than a minute.

 

(Example photo of memory card failure) If there is an error in memory, a red line is displayed as shown below. And the error level goes up.

 

 

If an error is detected in the picture above, the background changes to this red color. And the number of errors is counted.

 

In the memory, mark customer memory in the middle (I wrote "Expressions" in the name pen) and check. Successfully passed memory was labeled "Normal" and classified.

 

 

 

 

Customer's memory number 1 is normal as a result of the test.

 

 

 

 

Customer #2 memory is normal as a result of the test.

 

(You need to make sure that it is OK on its own and passes even when dual channel memory is configured. It's not clear whether that program is capable of conducting dual-channel testing. Run Windows to determine. First, plug it into the slot one by one to check the operation of the window, and if there is a problem by configuring a dual channel, operate it with one single memory again to check if there is any problem. cross-check with test memory of similar specification)

 

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The memory disassembles the customer's computer during the inspection process and performs a basic (minimum) behavior test. The screen will appear again this time as below. The screen appears, and the Intel CPU Checker is being installed and tested. It appears to be normal. The CPU also appears to be fine. (Assumption and not sure yet. This is because if the symptoms hide = it may not appear now.)

 

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CPU temperature rises, errors during certain operations, heat or power issues with the motherboard accessory to some extent, or problems only occur when the power supply voltage is unstable, so it can be very difficult to find the cause if the CPU-tested later.

 

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Therefore, it is easy for computers with repeated patterns of defective symptoms to repair. If symptoms of failure hide (intermittent defect), it is difficult to find them again. However, it is difficult to change parts that are suspected.

 

 

 

 

 

 

This time, the memory was recognized normally and entered the desktop. So I checked the CPU.

 

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Additionally, we are testing it with your graphics card. The problem doesn't appear very much. I cleaned the computer to rebuild it.

 

 

There is no problem even if I install the graphic card.

 

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To re-apply the thermal compound of the CPU and check the status of the CPU socket, we have disassembled the Intel genuine cooler.

 

 

 

 

Disassemble the existing cooler and re-apply the thermal compound. If I open it up to here, I have to check the CPU socket, so I lifted the CPU.

 

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As soon as you remove the CPU, you can see that the pins in the CPU socket are damaged. The pin in the middle of the 1 o'clock direction can be seen with the eyes. We see a pin out of the line, as if we're looking at a soldier on a parade ground. (The light reflection is dark, unlike the surroundings.))

 

 

 

 

The pin on the CPU socket is bent.

 

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Everyone is lying down and standing alone. The same-looking pins are so densely embedded that I can't tell each pin from the eyes. I also checked the condition of the bent pin while taking it in the smartphone contact mode. There is no technology to replace the CPU socket pin. Small pins like this can bend and break when unfolded, so I don't do braces often. In most cases, it is treated as a motherboard replacement.

 

 

 

 

 

 

The pin spilled like a serpent in the middle.

 

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In the past, the pins were thick and big, so it seemed to be seen, but these days, as the pins increase, they become thinner and the eyes are dim, so it is difficult to distinguish them with the eyes. I opened the bent pin, which is hard to see with my eyes, by scratching it with a blade. I tried my best to open it, but it can't be restored to its original shape.

 

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I think you should look for a repair shop owner who specializes in repairing CPU pins to replace them with normal pins. (It would be good if you search for CPU pin repair, and check the photos or YouTube videos of replacing it with "iron + magnifying glass + hot air fan" and leave it to repair the pin.)

 

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It is difficult to diagnose and repair faulty substrates. Circuit diagnosis and without accessories will also take a long time to repair. Lower demand or costs and expectations for results are high. As the price of parts decreases, I think it is difficult to calculate labor costs for low-end products. (Used <If labor costs are higher, you will choose second-hand over repair.) Repair shops are almost impossible to find in the neighborhood. You should look for a circuit repair shop near Yongsan. I'm lucky to meet the repair owner who fixes it cheaper considering the cost of a used motherboard.

 

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I don't have the skills to repair the board. Only "replacing the entire (Arsay) mainboard" is possible.

 

In the case below, the pin was luckily found its place without breaking, and sometimes the middle of the pin is broken, so we do not accept CPU socket pin repair. The pin has become so thin that I can't see it properly. It's a pin in the middle, so I made a reference point, and while counting the spaces, I found a bent pin, and I barely opened it with my finger sense.

 

 

 

 

 

 

I took pictures mainly of 9 pins with 3X3. The standing pin was spread out with a blade and laid down to resemble the side pins, and once bent, the pin leaves a mark in the middle.

 

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It's the middle pin.

 

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Your CPU is i5-8400. I was worried about inserting it for testing, so I installed my Celeron G4900 CPU first and conducted a main board test. I turned on all four of them with full bank RAM. The screen appears well.

 

 

 

 

I'm testing my CPU.

 

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I am also checking the status of the element on the bottom of the customer's CPU again, installing the CPU and trying to boot. The customer's CPU is also recognizing all four of its memory. Before, you said that if you reinstall the memory yourself, it became a computer, so did the symptoms of the failure hide? The actual user recommended that you use the repaired paper for more than a week. If you experience the same symptoms (CPU LED on and off and = repeat routine), we recommend replacing the used motherboard. The motherboard of the 8th and 9th generation CPUs has been discontinued and now there are only used boards.

 

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The H310 chipset is expected to be easy because it is an 8th generation i5 CPU. It would be better to have a B360 chipset board. The Z370 has a high price range, so it is difficult to use it for repair. It is difficult to use a used motherboard with a high price range in the workplace. Since the manufacturer's warranty period is over, the repair shop has to guarantee the motherboard, and if so, the repair cost including the warranty fee (insurance premium) will increase the repair cost for the high-end motherboard. So I usually use a low-end motherboard (H series, B series board).

 

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A lot of computers assembled with H or B boards on 8th and 9th generation i5 CPUs have been sold and used in practice.

 

There will be more "computer with H board" than "computer with B board."

 

"Z Board" is a rare user, so there is not much used board distribution.

 

 

 

 

 

 

Visually check for foreign substances (thermal) on the underside of the CPU or any small parts that have fallen off. Reinstalled on the motherboard and verified that the 4 memory is detected normally.

 

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Checking the tightness of the CPU cooler with the thermal compound repopulation operation

 

 

 

 

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As I checked when releasing the motherboard, there were several places where the support bolts that supported the board were not engaged, and there were support bolts that need to be removed under the motherboard board, so I corrected the position of the support bolts. I roughly measured the location, but there was no short circuit on the back of the main board.

 

 

 

 

 

 

 

Approximately checking the position between the support bolt and the motherboard element.

 

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The support bolts on the case of this computer are also not commonly used bolts, but rather have thick threads. 3.9mm (typically used support bolts are 3.3mm = the thickness of the screw that secures the hard disk) So, there are not many thick types, so I only found a few and tightened them.

 

 

 

 

 

 

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The support bolts look the same, but there are various types. The thick thread type also has slightly different heights as shown below. I don't think there will be any problem even if I use this high intersection. Still, I found four bolts of the same height and tightened the screws.

 

 

 

 

 

 

There are also various types of support bolts.

 

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And I put the main board down and tested the normal operation and released it. If a similar problem occurs in the future, I told you to replace the main board.

 

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Complex computer repair details are often summarized in text after inspection. I don't send them all like this. When it takes longer to explain in words, when you need a picture, I send you a summary like this. The repair price information is different depending on the case, so I blurred it.