Lenovo G50-30 no POST on powerup

[mcplslg123]

Re: Lenovo G50-30 no POST on powerup

@mauda, i dont know which schematic you are refrerring to but my schematic shows pu402 pin2(PG) GOES TO alw_pwrgd through a pull up resistor from +3valw.

[mcplslg123]

Re: Lenovo G50-30 no POST on powerup

This is the diagram i have.

[mauda]

Re: Lenovo G50-30 no POST on powerup

Omg, I am very sorry.

I have a different motherboard:
ZIWBO/B1/E0
LA-B102P Rev: 1.0
2014-06-12

Should I start another thread on this forum?

[mcplslg123]

Re: Lenovo G50-30 no POST on powerup

Yes, this thread is for NM-A311 and all advises are based on that mb which will mislead you. Better start a new thread.

[mauda]

Re: Lenovo G50-30 no POST on powerup

OK, I started a new thread here https://www.badcaps.net/forum/showthread.php?p=1020481.

[viking6791]

Re: Lenovo G50-30 no POST on powerup

Hi all, I have the same laptop with this issue. In my case the IO chip, IT8586E , was burnt. The chip was recovered from lenovo NM-A271 and programmed with a dump from this forum. Someone has found a solution to this defect?

[viking6791]

Re: Lenovo G50-30 no POST on powerup

I find the problems, someone changed the ram memory and it was not compatible, the laptop is working now.

[woxy]

Re: Lenovo G50-30 no POST on powerup

Hello,
I've got an G50-30 NM-A311 rev 1.0 mobo with no display - only led and no display.
Found burning hot KBC chip. Bought a mobo which comes to a backlight, capslock working, cpu seams heating up - but no display.
Replaced KBC chip from bought mobo - and nothing - no backlight, capslock.
Replaced BIOS chip from bought mobo - starts up, shutes down, caplock working - but nothing on display but backlight.
Tried differend found bios'es , but backlight and capslock work only in this from a bought donor board.
Tried to make a new bios from a manufacturer site - nothing,
tried to clear ME region with clean one - nothing.
What else can I try, or how to check if CPU/PCH is dead?

[woxy]

Re: Lenovo G50-30 no POST on powerup

So I'm stuck on this:
1. Original bios from mobo with cleared ME region - Black lcd with polarisation, works HDMI (with plugged LCD), VGA - only when LCD disconnected,
2. 2nd bios - withe ME cleared - same situation but LCD has backlight.

So different bios different LCD behave.
Can it be KBC needs reprogramming somehow?

[mcplslg123]

Re: Lenovo G50-30 no POST on powerup

Yes, kbc is programmable.

[woxy]

Re: Lenovo G50-30 no POST on powerup

Today I've changed KBC for new preprogrammed one.
Same story - so my old KBC was acting same as new one.