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n the morning, I received the machine from a colleague. He said that the customer had repaired the machine at someone else's house, and it didn't work after half a month. Yes, I got the machine, there are no screws on it , I opened it in a few minutes, it turns out that water has entered the inside, but it has been treated very well, and many resistors and capacitors inside have been welded, it seems that the cheapness is not good Here we go. I can't help but feel a little disappointed. There is no business today, so I have to pick up the phone, so I stay on the plane. Said to find out the problem and give him a reply, and then tell him how much it costs. The colleague left, and found the drawing number TE2. SB welded. The BIOS has been soldered. The crystal vibrates.
3 The 5-volt chip has been touched. Of course, the water inflow area seems to be very large, and the corrosion is very serious, so first add welding, cleaning, etc. to the place that should be welded. 35 volts has power. The switch has power and jumps, the inductance is normal to the ground, the crystal oscillator of the EC has a voltage difference, and there is no short circuit. You can only check one by one.
Firstly, it is tested that the transition of NBSWON# from the switch to the EC is normal. 95 feet jump to normal
According to the timing of this machine, the output should be S5-ON, but there is no response when measuring pin 26, ha ha. Immediately cut off the power and measure the ground, 770. It is normal. Then quickly measure the EC conditions. The power supply is 3.18 volts, the clock is available, and the reset is available. ACIN 2.66 volts, LID 0 volts. ? 0 volts? Is it so lucky? Immediately cut off the power and measure the ground, 003. Hehe , so lucky, directly find the source of this LID
MR1 analysis, it may be that this MR1 is broken, and this is also the hardest hit area. Remove it directly, and then measure the ground, more than 700, my God, no way, so cheap, find the same material board. Find this outfit. Then turn on the power, press the switch and there is no response, then test again. The 26-pin S5-ON is still motionless. It's all right, as expected, and then turn on the power to measure the LID of pin 93. It is already 3.1 volts.
But why is it still not triggered? Think about the BIOS being soldered. Then brush it again, after the brush is finished, the fault remains. Thinking about the conditions of this EC , there are not many measurements.Then test the RSMRST to the ground and it is normal. Could it be that the EC is broken? There is no way to find an EC to replace it. Power on the test again. 26 feet still not moving? then I wondered if the BIOS was flashed incorrectly? "I found another one from the Internet and installed it, but the fault still persists, 55555. Sad. . . Could it be that the chip is not welded well, and then measure the voltage . Measure it. 2.88 volts. 2.88. Not just now. How many volts is 3.1? Why only. 2.88. Could it be that my soldering is broken, or where am I connecting the pins ? a magnifying glass.No problem, look at this EC power supply by one. The resistor of 2.2 is directly pulled to the 3VPCU, this must be done. 3.3 volts, by the way, I remembered, why was the voltage here before the EC was changed. 3.1 few and not. 3.3, there must be 3.3 on the inductance, by the way, the resistor, find R583
Measure the next set of values. More than 100, haha. It seems that my luck has been so good. Find it now. 2.2 resistor installed. Reconnect the power and turn on the current. 003 remained motionless . test it first. 26 feet this this S5-ON. It has happened, and my heart is finally at ease. Then according to the sequence S5 voltage will be turned on. Directly find the S5 voltage 0 volts, as expected, huh, huh . That. The S5 is turned on, but the S5 voltage is not. It is easy to say, find it first. 15 volts can be seen. Because many of the Quanta boards are not powered by 15V. Measure it.15 volts is already normal, then find that the S5D signal is 0 volts.
Find PQ18.G extremely voltage. If the connection is not disconnected, then you can find PR175 directly. It turned out that the resistors were seriously blackened. Heh Ke, find a 1M one and replace it, and when I change it, I find that the solder pads at one end are gone. Connect it with a wire, and then turn on the power. . The current suddenly jumped to 0.8 and stopped. Hey, why are there so many questions, this kind of question is the most annoying . Tested. CPU reset. The SPD of the memory is normal, and it suddenly occurred to me that someone else has touched the SB BIOS.After swiping it, there is no hope. Connect the power and turn it on, and the current will go up, and then connect the screen, and turn it on as expected, but the result is still displayed.
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