A liquid crystal display of the Great Wall M9WE15 is not powered, and the indicator light is not lit. During the dismantling process, it was found that something was shaking inside, and it appeared that the hardware was damaged. After disassembling the machine, a broken piece was dropped from the inside. After checking the power supply high voltage board and the main board, it was found that the power IC had burst, and the broken piece was on the power supply IC (OB2269CP).
Power IC
The failure of the power circuit, in this case, it is estimated that the fuse is damaged and measured. It turned out to be normal. Check carefully, the power switch tube P6NK60ZFP breakdown, chip resistor R7 (0.22Ω) skin damage resistance is infinite, R9, R10 also burn black, diode D12 can not see the model also breakdown. I found the circuit diagram and compared it. R9 is 220Ω, R10 is 100KΩ, and D12 is 1N4148 switching diode.
Great Wall M9WE15 power primary circuit
OB2269CP was bought from a treasure before, and the power switch tube P6NK60ZFP was replaced by 7N60.
Power supply high voltage board
After all the damaged accessories were replaced, the components around the power IC were carefully checked again, for fear of a fish that leaked the net, or it was burnt and burned. Install the board to power it up. There is no bomber, but the indicator light flashes and there is a humming sound near the switch transformer . The multimeter measures the output voltages 5V and 12V are fluctuating, unplugging the motherboard and connecting the 5V and 12V no-load is stable. Suspected that the replacement of OB2269CP is bad, and replaced an OB2269CP, it is still in trouble. Some netizens said that the online purchase of OB2269CP may not be genuine, it is polished with other ICs, and can be replaced indirectly by SG6841, but the component parameters should be changed. Well, the SG6841 is used a lot on AOC's early displays. I found out the power boards of several AOC monitors. I finally removed them and changed them. I changed the R9 from 220Ω to 1KΩ. The resistance R10 of the 4-pin to ground was changed from 100KΩ to 33K ohms. It was normal again. This is the fix.All In One Gaming PC is the best choice when you are looking higher level desktop type computer for heaver tasks, like engineering or architecture drawings, designing, 3D max, video or music editing, etc. What we do is Custom All In One Gaming PC, you can see Colorful All In One Gaming PC at this store, but the most welcome is white and black. Sometimes, clients may ask which is the Best All In One Gaming PC? 23.8 inch i7 or i5 11th generation All In One Gaming Desktop PC should beat it. Cause this configuration can finish more than 80% task for heavier jobs. Business All In One Computer and All In One Desktop Touch Screen is other two popular series. Multiple screens, cpu, storage optional. Except All In One PC, there are Education Laptop, Gaming Laptop, i7 16gb ram 4gb graphics laptop, Mini PC , all in one, etc.
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