CPU getting power, even though system is off?

[Ichinisan]

Even if it's some Intel Management Engine kind of thing, I would not expect IME to generate a noticeable amount of heat.

Someone asked me to look at a dead Lenovo "Yoga 2 11" notebook model 20332. It won't turn on at all. No power light.

My meter shows 20v on the power supply briefly, before it goes to 1v. Maybe this is correct behavior, but I don't know without having another power supply and working computer to compare.

I opened up the computer. The system is passively cooled. I disconnected the main battery for a few minutes and plugged it back in, but the system still won't power on.

I desoldered the CMOS battery, waited a minute, and soldered it back. Nothing bridged. Still won't power on.

I re-assembled it and gave the owner the bad news: Probably needs a new motherboard, but I'll see if I can test with a similar power supply.

30 minutes later, I notice the system is warm. I took the bottom off again. Everything around the soldered battery is cool. The heat is coming from the CPU area.

It might be coming from the 2 metallic blocks on the left.
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Now it's closer to 1 hour later and it's still giving off heat. I guess that tells me the battery was not completely dead anyway. Maybe the system is on and there's just no screen or power light?

 

[LTC8K6]

The interweb seems to think this is likely a dead LCD screen...

 

[Ichinisan]

The interweb seems to think this is likely a dead LCD screen...

It's confusing because the power light doesn't come on. It appears that there is a power light built into the power button, but it doesn't light up. I also re-seated the ribbon cable that connects the power button + LED to the motherboard.

[edit]

I connected a micro-HDMI to HDMI cable and I'm getting no picture from external display.