Power on but no display, the issue happened after changed the thermal grease with battery disconnected. but then after changed the thermal grease and thermal pad, it stopped working now.
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1.CHECK BRIGHTNESS AND ALSO TRY TO CONNECT TO AN EXTERNAL DISPLAY.
2 FORCE RESTART, power off the device and then power it on after 15 seconds.
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It is not brightness issue and connected to external display not function all.
Tried force restart and follow the guide from reddit hold down volume up + power button to reset the device. still no luck, but once it a while the device can be turn on. when i plug in ssd or reopen the heatsink and put back, but now no more luck. i believe may be is due to static electricity or other electric leakage issue, cause the lenovo backplate case the screw see got electricity while charging.
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