ASUS UX31A won't start. Black screen, no LEDs, buzzing sound coming from motherboard.

[Romanio0089]

Hello, I need some help here.
My ASUS UX31A won't start anymore after a fan cleaning session. At first, after reassembly, there were the power LED, F2 LED, and Caps Lock LED all lighted up but with a black screen. Now, it became worse, black screen, no LEDs, and a strange buzzing sound coming from the motherboard when AC adapter is plugged in. AC adapter LED is green and sometimes, is orange but if I unplug it and plug it back, it becomes green again.. I tried all troubleshooting I could find on internet.
Here's what I did yet :

· Electrical discharge - unplugged battery, pressed and hold power button for 1 minute, plugging AC adapter and test.
· Trying to boot without battery.
· Unplugging and plugging back all motherboards connectors.
· Checked from burnt or damaged parts on the motherboard. Nothing found there.
· Pressing and holding power button for 30 seconds.
· Remove SSD and tried to power on.
· Disconnected IO board and tried to power on.
· Verified keyboard and power button connector. Nothing is loose there. I reseated it just in case and still nothing.

Nothing worked there so I need help.

Maybe the power button has gone bad, so if you know what pins to short to power on the laptop, im interested.

Here is a schematic if needed : schematic link here
Motherboard model : UX31A2 MAIN BOARD REV. 2.0

Thanks in advance for your time.

[peste]

Re: ASUS UX31A won't start. Black screen, no LEDs, buzzing sound coming from motherbo

remove everything from the motherboard (ssd, wifi, keyboard, cooler, cpu radiator, battery, etc) turn on the board and see what happens ... measure voltages..19v, 5v, 3.3v, etc, maybe you did some Shortly when you installed the radiator, or other component ... check this.

[Romanio0089]

Re: ASUS UX31A won't start. Black screen, no LEDs, buzzing sound coming from motherbo

remove everything from the motherboard (ssd, wifi, keyboard, cooler, cpu radiator, battery, etc) turn on the board and see what happens ... measure voltages..19v, 5v, 3.3v, etc, maybe you did some Shortly when you installed the radiator, or other component ... check this.

THANKS A LOT FOR REPLYING ! I'll try that and I'll let you know. If anyone have any other suggestions, im interested.