ThinkPad T14 G3 Not turning on, drawing 20V, 0A

[Neoxidon]

I got a Lenovo Thinkpad T14 Gen.3 here and it's not turning on. When plugged in draws 20v 0a, sometimes the power LED blinks 3 times. I'm a beginner in laptop repair and I'm not sure how to diagnose or repair this issue. Any ideas??

[mon2]

Remove all power. Meter in resistance mode (not diode mode). Measure the resistance to ground of the main power rail that is used to power this laptop. We are interested in the resistance to confirm there are no shorted parts on this main power rail. If there are, the current sense circuits will detect this fault and power down the laptop.

Post the measurement of the pin cluster @ pins 2-3-4-10 (any of these will do but pad #10 is underneath so use the others) and ground. One meter probe on any of the requested pins of PQ0202 dual mosfet and other meter probe to ground (metal shield is ok). NO power to the board during these resistance checks.

[Neoxidon]

Nevermind, sorry, I found the issue, I just did not notice this, you think this is fixable?

[mon2]

Grab some IPA (pharmacy grade alcohol because it is more pure) + Q-tip / cotton swabs. Soak in the IPA and clean this area up from the liquid spill. Do so gently so that the parts do not fall off. From a quick glance, this is the audio codec so no love lost if you lose the 'sound card' which can be replaced with an external USB audio sound card. However, the voltage rails need to be not shorting. It should be possible to repair this with the IPA cleanup. Saved a $3k macbook last week from a similar incident - Apple (Nerd herd team) wanted to the professor to scrap the unit.

[Neoxidon]

Thank you! laptop is fixed but bios wants a password, any idea on how I can deal with that if I don't know the password?

[mon2]

What was the fix for your laptop? The same corrosion of the component as per post # 3?

Post your bios image + serial # inside the dedicated bios forum. Someone there will be able to assist you to remove the password.

[Neoxidon]

thank you! fixed it by cleaning it up and replacing a shorted capacitor that was there probably due to the spill

[Neoxidon]

thing is how do i get the bios image? and the laptop wont boot until i give it a supervisor password, any help?

[rogfanther]

Use a reader to backup your image ( CH341a, for example ) . Then post it along with the other info required in the Bios Sub-Forum.

[Neoxidon]

oh i see, alright thank you!