da0r75mb6cd0 REV: C mising +1.8V VGA

[Techtiger]

Hi guys
got here a problem with this MB da0r75mb6cd0 REV: C laptop starts up but no image found out missang voltage
PL26 0v
PL7 0V
schematics page 43 VGA +1.0V VGA & +1.8 VGA

PU14 IC

PIN 1 0V
PIN 2 0V
PIN 3 0V
PIN 4 0.9V
PIN 5 0V
PIN 6 0V
PIN 7 0V
PIN 8 3V
PIN 9 3V
PIN 10 3V


PU2 IC
PIN 1 0V
PIN 2 0V
PIN 3 0V
PIN 4 0.9V
PIN 5 0V
PIN 6 0V
PIN 7 0V
PIN 8 5V
PIN 9 5V
PIN 10 5V

schematics

https://www.badcaps.net/forum/attach...6&d=1409168384

need help

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA



If i give required voltage from power supply to PL 26 & PL7 what will happen ? PCH & VGA chips gets heat does it mean Vin ok for this 2chips?

[caspian]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

If you do that, it is possible that the GPU chip gets damaged. Leave PU2 and PU14 alone. they seem OK. first, you have to check if the laptops has cpu_core voltage on PL11 or PL12.

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

Ok thanks for the reply I check the voltage on
PL 11 +Vcc core 1.8v
PL 12 +Vcc core 1.9v

Found out another missing Voltage
Pl 23 +Vga core 0v
Pl19 + Vga core 0v
IC chip PU8 is connected to the coils I check the mosftes related to the colis 19v in ok !
PU8 do have to check DRVL 1 & DRVL 2 out puts ? Or any other pins to to check any test points in this ic ?

[caspian]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

now you have to find a shop that has another CPU which is compatible to this mainboard. then, ask them test this mainboard with a healthy CPU. or test your CPU on another mainboard.

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

Ok i will do it and let you know soon

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

I I tested with working CPU but still no image

PL26 0V page 42
PL 7 0V

PL 19 0V page 42
PL 23 0V

To get gate pass ( PU8 IC ) page 42

DRVH1 0V PQ19
DRVH2 0V PQ19

DRVH3 0V PQ20
DRVH4 0V PQ20

Do you need Pin 1 PU8 to get Gate V (pin1-EN) is it a voltage or signal?
DGPU EN

Do you need Pin
42,43,44,45,46,47 PU8->GFX CORE to get Gate V is it a voltage or signal?

What is SW1 SW2 in PU8? pin34/37
and what is VID pin 42.43.44.45.46 PU8 voltage or signel ? is this also need to give the gate passevto DRVH1/1 DRVH 2/2 ?

All the rest voltage I have given color's are ok


as for PU14 IC page 43
Pin 5 EN 0V or signel ? (DGPU EN)
and for PU2
Pin 5 EN 0V or signel ? (DGPU EN)

need help from all bad cap community
thanks in Advance

[piernov]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

DGPU_PR_EN should be 3.3V for the VGA voltages to come up. This signal appears when the BIOS starts running.
Pin 42-48 of PU8 set the output voltage for VGA_CORE. You can take a look at the table on page 42 to know the output voltage depending on the state of those signals. But you must get DGPU_PR_EN first anyway.

Check the APU_RST# signal. It must be high (above 1V) for the CPU to turn on and for the BIOS to start running. If APU_RST# is above 1V, try to flash a working BIOS. (back it up first)

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

merci beaucoup pour votre aide j'apprécie
thank you very much i wiil do it and thanks for the OpenBoardview file

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

i check the APU_RST# signal but U8 is not inclued but
Pin 1 1.5v with out IC
Pin 2 DNG
Pin 4 0.4V
Pin 5 4V
Pin 6 0V

R241/R235 not include but have 1.5V

what if i give a jumper 3.3V to PU8 Pin 1 DGPU_PR_EN what will happen will the IC blown out ?
i will flash BIOS to give a try

[caspian]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

If you jump it, some component will probably get damaged.

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

Thanks Caspian

[Techtiger]

Re: da0r75mb6cd0 REV: C mising +1.8V VGA

Guys missing voltage solved after flashing bios MB working fine
Thanks piernov & Caspian