I am getting crazy with this laptop for which the closure of the lid doesn't affect the sleeping mode. All drivers are okay and managed by Lenovo Service Bridge but the Lenovo Diagnostics Tool reveals that there is a fault for the lid sensor. Looking at the schematics (http://sualaptop365.edu.vn/attachments/ ... -pdf.3783/ for the motherboard page 34 and 70 and http://sualaptop365.edu.vn/attachments/ ... -pdf.3786/ for the board with the lid sensor) I found the signal produced by the IIRC hall-effect sensor (LID_SWITCH) that is connected to the pin 27 of the chip U39 (on the motherboard) to drive the sleeping mode. So... I completely disassembled the laptop, tried to change the entire button-board (that includes the IIRC sensor) with a new one and checked the continuity for the signal LID_SWITCH from the sensor EM1792 on the bezel board (that one with the buttons in the bottom side of the display) to the motherboard. Finally, as you can see in the video attached, I set the laptop in BIOS -to by-pass all possible SW/drivers- and tried to check the voltage on U39 pin27 (signal LID_SWITCH) when a magnet is placed near the lid sensor. Everything looks like OK and the presence of a magnet correctly forces the LID_SWITCH from 3.3V to 0V. Do you have some advice for me to proceed the troubleshooting?
other stuff here http://sualaptop365.edu.vn/threads/wist ... view.2121/
- Similar Topics
- Last post
Who is online
Users browsing this forum: No registered users and 10 guests