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There is a customer complaint: but there is no image. Thecustomer himself did the cleaning and maintenance of the motherboard. then hecollected the computer and there was no vision
Visually inspected the motherboard once. I didn't see anybroken resistance or a damaged line.
Took the motherboard out of the case. There was anisolated label on the back of the motherboard. Took it off. and I saw that anSMD capacitor belonging to the CPU VCC_GT line had fried. and it was shortcircuited. Removed the short circuit capacitor. I started the motherboardstill the same situation. fans freeze fast and no display. Said to myselfthat I need to examine it from the sky now. there was signal timing in theschematic of the motherboard. Measured everything in order with the method. Iknow and the timing on the motherboard. All VRM output on the motherboard wasintact. there was just no VCC_GT voltage. There was an abnormally low value on the CPU VCC_GT line. 0.002 ohms.this was so abnormal. Removed the DrMOS IC. there was still a short on theVCC_GT line
There was a high probability that the CPU was bad. Ordereda scrap motherboard on ebay. Motherboard belongs to dell machine. had liquidcontact. Measured the CPU line, there was no short circuit. I changed the CPUat risk.
Took remeasures and the CPU line VCC_GT was normal. the averagevalue is 0.023 ohms
Everything is perfectly normal. I changed the CPU. Iconnected it to the power source and started. Still no image and still no voltage VCC_GT
Let's think a little...  Why is there still no image? The current drawn from thepower supply is normal. Meanwhile I reprogrammed the BIOS and EC. I edited theBIOS on the official site. I'm pretty sure it's the BIOS.
I connected post card from EC Debug line. post code 63. this error code points to IntelHD graphics card[/al ... 本帖为优秀帖，如要查看隐藏内容，需使用100鑫豆兑换（鑫豆全部给作者）。写帖不易，请多支持。立即支付 | 
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发表于 2023-5-13 03:10:17
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