anhbanxoi
Senior Member
Last Activity: 02-12-2025, 08:29 PM
Joined: 09-04-2021
Location: Ho Chi Minh
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So mean that you're doing something wrong repetitively... -
Short those signal cannot kill your CPU but these are too small so you may ended up shorting other signals that can kill your CPU. So be careful....Leave a comment:
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No need, just short the LPC_AD0:3 to ground....Leave a comment:
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2KB EEPROM just for serial, model, bios password. Laptop still can turn on without those informations. You can later program it with U1 tool...Leave a comment:
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Just replace the MEC. This MEC doesnt have any firmware inside. The firmware for EC chip is inside BIOS. Check your bios with uefitool you will see a region call EC....Leave a comment:
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Force DFU and restore with Apple Configurator...
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Do you get any voltage at pin 2 3 4 5?...Leave a comment:
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Try to plug usbc cable to the thunderbolt port nearby. The laptop may turn on
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PL501 is pretty low. Try to inject voltage 0.8V ~2A to this coil and see any components get hot or how much current it takes....
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5V at the input also indicate that there is a short on power rail downstream. Try to measure diode mode on all coils, if there is no short then try to plug in the battery and measure voltage of PR304 to see if main power rail present....Leave a comment:
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MEC1503 you can buy it on aliexpress. Just replace it and rewrite serial number, product id with Lenovo tool....Leave a comment:
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Base on datasheet there is 2KB ROM inside which is used to store password and other informations like serial number, model, .... You can use lenovo tool to dump this rom content but cannot reach the part that store password....Leave a comment:
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Check your battery also. Sometime not genuine battery can cause CPU limit. Check your CPU clock in Task Manager....Leave a comment:
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With LPC protocol, this method should work. Try harder....Leave a comment:
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Possible but need to try a lot of times....Leave a comment:
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Flash chips in VSCC table:
EF4019 (Winbond W25Q256)
C27519 (Unknown 00C27519h)
204319 (Unknown 00204319h)
C84019 (GigaDevice GD25x256C)
You need to use W25Q256 instead of W25R256...Leave a comment:
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You can take any N-Channel mosfets from power supply circuits that fit the size on that battery. Remember to replace both of themLeave a comment:
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Take a closer look at the chipset you will find something like SRxxx. It's the model of the chipset....Leave a comment:
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Try to measure EDP_INT_AUX_P and EDP_INT_AUX_N signals in Diode mode. I think you will need to change U9850. I got the same problem in few A2141s.Leave a comment:
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