G580 black screen

[pratyush]

Power is ON but black screen, Plt_rst signal present,
voltage on ram slot dimm1, 1D5V_S3 & 0D75V_S0 are ok,
I changed many rams but condition is same what will be possible solution? Any suggestion?

[kammy6000]

Re: G580 black screen

Anything on external display

[ktmmotocross]

Re: G580 black screen

why u think it have something with ram

as first reflash bios. have some of this with corrupted bios

[Romy2018]

Re: G580 black screen

try flash bios this model is common for bios issue

[mcplslg123]

Re: G580 black screen

Power is ON but black screen, Plt_rst signal present,
voltage on ram slot dimm1, 1D5V_S3 & 0D75V_S0 are ok,
I changed many rams but condition is same what will be possible solution? Any suggestion?

Does usb kbd numlock glows?? I mean mb boots?? If so, bios flash should be the first step as suggested by many members.

[pratyush]

Re: G580 black screen

Anything on external display

Nothing on external display & Usb keyboard numlock or capslock led doesn't glows.

[pratyush]

Re: G580 black screen

why u think it have something with ram

as first reflash bios. have some of this with corrupted bios

already flashed bios bt condition is same.

[pratyush]

Re: G580 black screen

why u think it have something with ram

as first reflash bios. have some of this with corrupted bios

At first time I checked on dc supply and I got current signal is upto 86-87mA, thats why i was thinking ram issue.

[pratyush]

Re: G580 black screen

Some measurements:
5V_S0 OK
3D3V_S0 OK
1D8V_S0 OK
1D5V_S0 OK
0D85V_S0 OK
0D75V_S0 OK
VCC_CORE OK
RTC bat 3V

[pratyush]

Re: G580 black screen

VCC_GFXCORE dead-
Associated MOSFET PU4402 gets DCABATOUT OK.
No signal on the driver PU4401: PWR_GFX_CORE_DRVL, PWR_GFX_CORE_DRVH, and PWR_GFX_CORE_GPWM all have no signal.

[mcplslg123]

Re: G580 black screen

What is the voltage on PIN30 of ram slot??(DRAMRST). Should be around 1.35-1.50v. If this signal is missing then also you wont have GFX core voltage.

[pratyush]

Re: G580 black screen

What is the voltage on PIN30 of ram slot??(DRAMRST). Should be around 1.35-1.50v. If this signal is missing then also you wont have GFX core voltage.

Yes, signal is missing.
how can I solve this?

Thnx for your reply.

[mcplslg123]

Re: G580 black screen

Check voltage on Q3703

[pratyush]

Re: G580 black screen

Check voltage on Q3703

sorry brother, He took his laptop back today.
Thank you for all your help.

[mcplslg123]

Re: G580 black screen

sorry brother, He took his laptop back today.
Thank you for all your help.

You cant help this as your customer is in a hurry.