Locate the speakers (typically 2) found on the left and right sides of the system and trace the wiring back from each speaker to a single, 4 pin connector located on the system board. Typically, the keyboard, palmrest and keyboard bezel must be removed. Refer to Lenovo Hardware Maintenance Manuals on the website for details. If your system is outside of warranty, and you wish to troubleshoot further, remove battery and power and dissassemble the system to allow access to the speakers. Try plugging / unplugging the headphone jack several times to see if the stuck condition can be resolvedĬontact Lenovo service if the system is still in warranty if you were not able to resolve. If audio works through headphones, then likely the drivers and audio components are working correctly and either there is a problem with the headphone jack mechanical assembly, or a problem with the wiring for the internal speaders, or other defect with the internal speakers. When the headphone jack is removed, that shunt should return to the original position, that completes the internal speaker circuit. The jack pushes a small piece of metal over - that disconnects the internal speakers. Typically the way a headphone jack turns off the internal speakers is by means of a mechanical shunt. I turn up the volume button to no effect. On my Thinkpad T410s, I can hear the sound while using the headphones, but when I unplug the headphones it has no sound.
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