Lenovo Y700-17ISK turn on and off

[pajdek]

Hello, i have some issues with my laptop Lenovo Y700-17ISK (motherboard BY511 NM-A541), it started when i turn on the laptop, but the lcd wont turn on, i then connected it via hdmi to tv and screen was ok. So i thought maybe lcd stripe is faulty, i removed the bottom cover, disconnected main battery, reset the cmos by disconnecting battery for 1 min, then slighty move the lcd stripe. Conncted power supply and tuned on my laptop, the lcd turn on, it started to load os, then it turn off, after a second it turn on, then after like 3 seconds turn off again, and so on. Removed power supply, waited few minutes and connected power supply again and the laptop turn on itself for few seconds, then turn off, the turn on again, and so on.
Any idea whats going on? PCH dead? I measured cpu, gpu and pch mosfets - seems ok, no shorting. Any thoughts?

[mcplslg123]

Re: Lenovo Y700-17ISK turn on and off

Measure voltage on JEDP1 on the following pins.
INVT_PWM
LED_VDD
DISPLOFF#
LCD_VDD
EDP_HPD

[pajdek]

Re: Lenovo Y700-17ISK turn on and off

Ok, thank you, will check it when i get home.

[pajdek]

Re: Lenovo Y700-17ISK turn on and off

Well nevermind, it just died, wont turn on anymore.
LED_VDD was 1,8, rest 0.