HP G62-b30sc - black screen , need EC bios

[DeniS182]

Hi all,
I have problem with this laptop. Laptop turns on automatically after power adaptor is connected, fan running , leds lights up and screen is black and when I hold power button to turn laptop off , it only reboot laptop. Have someone EC bios dump for this laptop? mb p/n 01013tm00-600-g

thanks for any answer!

[angel-boy]

Re: HP G62-b30sc - black screen , need EC bios

https://www.badcaps.net/forum/showthread.php?t=55113

[Djosla]

Re: HP G62-b30sc - black screen , need EC bios

Don`t bother with bios...this board has only one main bios...you have a faulty northbridge...Replace it...

[DeniS182]

Re: HP G62-b30sc - black screen , need EC bios

I replaced 216-0752001 and still black screen. Any idea?

[caspian]

Re: HP G62-b30sc - black screen , need EC bios

have you checked any voltages and signals yet?
If you report your measurements, you get a better help.

[DeniS182]

Re: HP G62-b30sc - black screen , need EC bios

Voltages seems to be ok. Please help me what else to measure.

+V5A - 5V
+V3.3AL - 3.3V
+V5AL - 5V
+VCC_NB - 1.115V
VLDT-V1.1S - 1.118V
VRM_PVRGD - 3.24V
+VDDR_CPU - 1.087V
+VCC_CORE - 0.998V
+VDDNB_CPU - 1.019V
+VDDA_PWRGD - 3.3V
+VDDA_CPU - 2.5V
V1.8S_PWRGD - 3.3V
+V1.8S - 1.813V
+V5S - 5.1V
+V3.3S - 3.3V
+V12S - 12.9V
+V0.75S - 0.765V

[caspian]

Re: HP G62-b30sc - black screen , need EC bios

have you reprogrammed BIOS/EC?
now measure voltage on pin 33 and 125 of IT8502E before and after plugging the AC adapter in.

[DeniS182]

Re: HP G62-b30sc - black screen , need EC bios

Yes, but I can test other dump.
With adapter:
pin 33 - 3.345V
pin 125 - 3.342V

Without adapter - zero values.

[ktmmotocross]

Re: HP G62-b30sc - black screen , need EC bios

u have GPU so reball it or replace it

[caspian]

Re: HP G62-b30sc - black screen , need EC bios

check whether a pulse appears on pin125 or not.

[DeniS182]

Re: HP G62-b30sc - black screen , need EC bios

ktmmotocross: I'll try another dump and then reball gpu.
caspian: on pin 125 is still 3.3V

[caspian]

Re: HP G62-b30sc - black screen , need EC bios

unfortunately, SIO and PCH may act strangely sometimes.
they make it difficult to diagnose sometimes.
we cannot diagnose whether it is SIO or PCH which is faulty.
For example, I replaced SIO this week but it was not faulty in the following thread:
https://www.badcaps.net/forum/showthread.php?t=65278
replacing PCH is not cost/time-efficient on cheap mainboards.
So if you can get a healthy mainboard, just replace the entire mainboard.