Lenovo G50-30. not turn off while on charger!!!!

[Weelcup]

dear friends
I have a Lenovo G5-30 mother board which is not showing anything on screen when I turn it on. only power on lid no overheating at any chips. and when pressing the power botton for very long the lid will shut for a millisecond and light up again (so not shutting off)… but when I use a battery the it powers on by pressing the power (no display too) and if I press the power botton for a while the lids will turn off.

any clue what might cause the issue.

3.3v and 5.0v are present.

thanks

[caspian]

Re: Lenovo G50-30. not turn off while on charger!!!!

remove the battery and check which voltage rails are present after pressing the power button when using the charger. I mean mention all the present voltage rails.

[SMDFlea]

Re: Lenovo G50-30. not turn off while on charger!!!!

Have you tried it on an external monitor ,on VGA or HDMI

[Weelcup]

Re: Lenovo G50-30. not turn off while on charger!!!!

remove the battery and check which voltage rails are present after pressing the power button when using the charger. I mean mention all the present voltage rails.

thanks for the reply when I use the charger. the laptop powers on without pressing the power botton. and give a back screen only. and if I tried to to power it off by holding the power botton for long, it it keeps running.
however, when the laptop is only on battery. it doesn't turn on by itself. I need to press the power botton. so the when pressing the power botton, it starts but also giving only black screen.


the same situation happen when even I use a external monitor.



thanks

[caspian]

Re: Lenovo G50-30. not turn off while on charger!!!!

I had similar problem in various laptops. In some of these cases, the cause was faulty PCH. I hope something else is faulty in your laptop.

[Weelcup]

Re: Lenovo G50-30. not turn off while on charger!!!!

I had similar problem in various laptops. In some of these cases, the cause was faulty PCH. I hope something else is faulty in your laptop.

lets imagine its not PCH …

[crowntoy99]

Re: Lenovo G50-30. not turn off while on charger!!!!

Re flash bios...

[Weelcup]

Re: Lenovo G50-30. not turn off while on charger!!!!

Re flash bios...

I did reflash bios. no change.
actually I removed bios chip from the board and connected the board to power supply without the bios chip, same result. so I suspected the EC chip.

therefore I programmed the EC chip. but same result.

[tomodachi]

Re: Lenovo G50-30. not turn off while on charger!!!!

try to short the JCMOS1 and JME1 pads then try again, make sure RTC battery is good.

[Weelcup]

Re: Lenovo G50-30. not turn off while on charger!!!!

try to short the JCMOS1 and JME1 pads then try again, make sure RTC battery is good.

actually I removed the rtc battery to avoid its tricky faults. but I will do the jumper and come back with the result...

thanks to follow up...

[Weelcup]

Re: Lenovo G50-30. not turn off while on charger!!!! (SOLVED)

actually I removed the rtc battery to avoid its tricky faults. but I will do the jumper and come back with the result...

thanks to follow up...

I tried that nothing new same issue.
the final step I taken before giving up was to change the EC chip (IT8586E).
I could read and write its original EC chip. I already programmed it two times. but it did not solve the issue.


I had a new chip. and I just programmed it and replaced the original one. surprisingly, the board is fully working. believe or not it was the EC chip that was causing the issue.


one thing I noticed about the old chip that it was hard to be identified by the programmer (I have RT809H). and I used to program it offline via adapter. so I was assuming that some of its pins were not soldered well. because after couple of soldering check the chip were read/write able and was identified by the programmer. however, I believe now that the identifying issue were related to the chip itself. cuz I had no need to double check the new chip after I soldered it and it was recognised very fast.

So according to this experience I would suggest to change the IO chip if you face similar symptoms. SPECIALLY, programmer identifying issues.

I DO APPERICIATE ALL WHO REPLIED ME AND HELPED ME TO SOLVE THE PROBLEM.. THANKS A LOT.
I am glad the problem is solved.

[piernov]

Re: Lenovo G50-30. not turn off while on charger!!!!

Nice find, thanks for the information. I wouldn't have thought of EC in this case.

[Weelcup]

Re: Lenovo G50-30. not turn off while on charger!!!!

Nice find, thanks for the information. I wouldn't have thought of EC in this case.

Thanks,
Yes exactly, I wasn't expecting it to be the EC too, because its old EC was readable and programmable 100%.