source:power adapter Popular:adapter release time:2021-04-15 10:23:16 Article author:sznbone
How to repair a broken power adapter
1. Tool preparation
In fact, the notebook power adapter is not a high-tech product. In fact, the principle is basically the same as that of power adapters such as mobile phones and digital cameras. Anyone who knows some electronic knowledge can repair it. Therefore, we only need a multimeter, screwdriver, welding tools, etc. (Figure 1).
2. Disassembly process
If the external power supply does not supply power, you can plug in the battery and try. If the machine can start normally, there may be a problem with the power cord or the adapter. Then check with a multimeter to find out whether there is a problem with the power cord to simplify maintenance. Don't try to open the adapter shell at the beginning.
First unplug the octa-shaped cable and the connection line of the power adapter (as shown in Figure 2), first use a multimeter to check whether the octa-shaped cable of the power adapter is short-circuited; if so, you must replace an octa-shaped cable. Of course, if the fault persists after replacement, then the power adapter must be disassembled.
There are 4 plastic caps on the power adapter. First buckle them down, then use a screwdriver to remove the screws (as shown in Figure 3), and then open the adapter shell. Please note: When removing the adapter, do not damage the shell as much as possible. After the damage, there will be problems such as enhanced electromagnetic radiation, which will affect the stability of the machine. If the shell is damaged, try to repair it.
Open the shell, the first thing we see is the shielding layer (Figure 4), carefully remove the shielding layer. Then we can see the internal circuit boards and capacitors and other components. The power adapter, in fact, is nothing mysterious, and there is no principle difference from ordinary switching and voltage regulator circuits. That is, some capacitors, resistors, inductors, switching diodes, power core chips, etc. (Figure 5).
3. Find the fault
First, check the solder feet with naked eyes, and then check the circuit with a multimeter. If the circuit is intermittent, it is usually a bad contact. Check the capacitor, resistance, and inductance for any problems. If the capacitor is bulging, it is best to replace it in time to avoid hidden dangers. Use a multimeter to check the protection circuit and rectifier circuit. Figure 6 shows the protection circuit. The rectifier circuit is a filter circuit composed of inductors and capacitors, and then enters the switch tube circuit composed of transistors (Figure 7).
During the test, the author found that the resistance pin was soldered (as shown in Figure 8), and then repaired it with a welding tool, installed the power adapter again, and started the test, and the problem was solved.
It should be noted that if you encounter a problem with a certain capacitor during the testing process, you can buy a capacitor with the same model and capacity (the price is about 5 yuan), and then solder down the problematic capacitor and solder the new capacitor on. That's it.
If you find that there is a problem with the IC power chip, you can solve it in the same way. Of course, since the IC chip is definitely one of the most important electronic components in the power adapter, the circuit is too complicated, so I found a circuit diagram inside the power adapter (Figure 9), and look for the fault according to the circuit diagram, which can easily solve the problem. .
When in use, because the current notebook power adapter power is about 65 W, the internal heat is mainly dissipated through the conduction of the plastic shell. The surface temperature of the power adapter is still quite high. It is estimated that the temperature is generally around 80°C. Therefore, when you use a laptop, try not to pile things on it, especially flammable materials, otherwise there will be amazing results.
4. Finally
In addition to the usual maintenance, when buying a laptop or purchasing a power adapter separately, you need to pay attention to the quality of the power adapter. Do not buy shoddy products. Strong quality and good treatment of yourself will be a very good thing. The ending. As for the maintenance of the power adapter, you can usually read more of these information. If your electronic level is limited, especially when welding circuits, you may as well ask a knowledgeable friend to help. Of course, it is best to send it for repair during the early warranty period. s Choice.
Read recommendations:
24-65W Medical Switching Power Supply
MKS-1203000EX Switching Power Supply
Why use a switching power supply? What are the advantages?adapter power Merchant
Popular recommended products
200-500W Switching Power Supply
2020-08-2924-65W Switching Power Supply
2020-08-2912V2ASwitching Power Supply
2020-08-28MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-28EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-28EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-28EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28ER42 High Frequency Transformer
2020-08-2712-36W POE POWER SUPPLY
2020-08-27Transformer,Power Transformer,Ring Power Transformer
2020-08-27Transformer,High Frequency Transformer,Frequency Transformer
2020-08-2712-24W Medical Switching Power Supply
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-2745W PD Charger,45W Charger,PD Charger
2020-08-2736-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger
2020-08-2724W USB Charger,24W Charger,USB Charger
2020-08-2724W 2USB Charger,24W Charger ,2USB Charger
2020-08-2710-24W Charger,24W Charger,10W Charger
2020-08-2730-500W LED Power Supply 30-500W Power Supply
2020-08-27Related Information
What is the structure of the notebook power adapter?LINEAR ADAPTOR
2022-02-15What is a power adapter?Linear Power Adapter
2022-02-15Power adapter characteristics
2021-12-17How to choose the right power adapter for yourself?
2021-12-17R & D and production of more types of power adapters.power adapter Manufacturing
2021-12-07Power adapter CE certification.power supply adapter company
2021-12-03The main purpose and function of the power adapter.indian adapter Manufacturing
2021-12-03The difference between power adapter.dc power adapter wholesaler
2021-12-02Application of high frequency power adapter.dc power adapter wholesaler
2021-12-02Principle of switching power supply.india plug charger Merchant
2021-11-30Understand the cause of low output voltage caused by power adapter.ac power adapters Production
2021-11-30Is the power adapter a switching power supply?ac power adapters Production
2021-11-27What are the common insulation shielding technologies for power adapters?ac power adapters Productio
2021-11-279V power adapter price.india plug charger Merchant
2021-11-26power adapter customization.ac power adapter wholesaler
2021-11-26U.S. power adapter manufacturers.india plug charger Merchant
2021-11-25Power adapter customization.indian amplifier wholesaler
2021-11-259V power adapter.wall charger Factory
2021-11-24Switching power adapter manufacturer customization.adapter manufacturer
2021-11-23U.S. power adapter.adapter manufacturer
2021-11-23Quality issues must be considered when power adapters
2021-11-20usb power adapter.power supply factory
2021-11-20US standard power adapter wholesale customization.adapter manufacturer
2021-11-19Which switching power adapter is better.CE ADAPTOR wholesale
2021-11-19Which computer power adapter is of good quality.ac power adapter Processor
2021-11-18How to choose the right power adapter for yourself?ac power adapter Processor
2021-11-18Switching power adapter customization.AC ADAPTER wholesale
2021-11-17Which is the best standard power adapter?CE ADAPTOR Production
2021-11-17How to choose the right power adapter for yourself?
2021-11-1624V power adapter wholesale customization.LINEAR ADAPTOR sales
2021-11-16Popular recommended products
12W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY
2020-08-27EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-2812W 2USB Charger,2USB Charger,12W Charger,USB Charger
2020-08-2718-25W Switching Power Supply
2020-08-28EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-2824W USB Charger,24W Charger,USB Charger
2020-08-2760W 6USB Charger,60W Charger,6USB Charger,Charger
2020-08-2712W CAR CHARGER,12W USB CAR CHARGER,CAR CHARGER,12W CHARGER
2020-08-2724V21A LED Power Supply 24V Power Supply 21A Power Supply
2020-08-27MKS-1203000EX Switching Power Supply
2020-08-29MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-2830-500W LED Power Supply 30-500W Power Supply
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-27EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-2836-65W Switching Power Supply
2020-08-29QC3.0 24W USB Charger,24W USB Charger,24W USB Charger,USB Charger
2020-08-2724W 2USB Charger,24W Charger ,2USB Charger
2020-08-2740W 4USB Charger,40W Charger,4USB Charger
2020-08-27MKS-1202000-36 Switching Power Supply
2020-08-2936-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger
2020-08-27Transformer,High Frequency Transformer,Frequency Transformer
2020-08-273-15W Switching Power Supply
2020-08-28500W Charger,Charger
2020-08-28ER42 High Frequency Transformer
2020-08-2772-200W Switching Power Supply
2020-08-29EI-28 AC ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter Linear Adapter
2020-08-2830W PD Charger,30W Charger,PD Charger
2020-08-2719V2A 36W Switching Power Supply
2020-08-283-100W PCBA power supply 3-100W Customized power supply 3-100W power supply
2020-08-27MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28