Lenovo B580 LA58 11273-1 - no reaction on PWRBTN

[ktmmotocross]

Hello.
I have Lenovo B580 LA58 11273-1 with no reaction on PWRBTN, but charging. i found no EN signal on 5/3.3V IC. flashed bios and now have 3.3/5V,REG, EN but still no reaction to PWRBTN.

[Sephir0th]

Re: Lenovo B580 LA58 11273-1 - no reaction on PWRBTN

Make Sure it is known working BIOS or try with another bin. And of course, Check whether the Power Switch is working Like expected.

[ktmmotocross]

Re: Lenovo B580 LA58 11273-1 - no reaction on PWRBTN

i have only bios from alisaller so im waiting to get anotheone. dont have shematic so i dont know what pin on KBC is PWRBTN, but on powerswitch board everything works

[SMDFlea]

Re: Lenovo B580 LA58 11273-1 - no reaction on PWRBTN

i have only bios from alisaller so im waiting to get anotheone. dont have shematic so i dont know what pin on KBC is PWRBTN, but on powerswitch board everything works

This schematic is close enough - https://www.badcaps.net/forum/showthread.php?t=63855

[ktmmotocross]

Re: Lenovo B580 LA58 11273-1 - no reaction on PWRBTN

after next flash of bios i have working board. But still not reaction to PWRBTN when i attach LCD cable.
replaced/removed display and unconnect camera but still the same. can this make bad LID sensor?

[ktmmotocross]

Re: Lenovo B580 LA58 11273-1 - no reaction on PWRBTN

looks like it can. desoldered lid sensor from little board and everything works

but i lost that damn little sensor. it is universal so i can use one from another board?