11-07-2017 11:34 AM
I needed to replace my keyboard on my Thinkpad Yoga 20CD, so I swapped parts, and long story short, no post, no BIOS, no external video. When I plug in the AC adapter, I get 3 blinking red lights on the "i" Thinkpad LED. If I press the power button, the backlight on the keyboard comes on for 1 second, fades away, and the red LED stays on. Fan on the CPU spins for about 3 seconds, then stops. There is a chip on the motherboard underneath the card reader that gets EXTREMELY hot on both the AC power and battery, even without turning it on.
I guess I just need to know if I somehow fried the board when swapping parts? If there is a short somewhere on the board? Is there anything I can do to get it to boot, and prevent it from getting so hot? I've tried a complete power drain, removing the CMOS battery, and leaving it sit overnight with nothing plugged in, all to no avail. Any help or suggestions wold be greatly appreciated.