Asus X542UQ no display

[lapfix]

Hello my friend

Got this motherboard come to me with some interventions before

Interventions :

First mosfet PQ8901 and PQ8901
PR8938
PU8001

i find PQ8901 faulty change it all voltages are ok ( D/S/G )
Just re solder PU8001

the lap power on , reach amp 0.450 amp , no display and of course the consumption is not enough .

All voltages are present except
+VCCGT ( no pb for this )
+NVVDD 0v and +FBVDDQO for Graphic card.


U3001 :

96= PM_RSMRST# =3v ok
22 = BUF_PLT_RST# = 3v ok
68 = ALL_SYSTEM_PWRGD = 3v ok


PU8001 :
42 = IMVP8_PWRGD = 3v ok

PU8600 :
+2.5V ok
+VTT ok
SMB_DATA_S3 and SMB_CK_S3 ok
1.2V_PWRGD = 3v ok
BUT DDR4_DRAMRST# = 0.050v

Flash bios , uma conversion same issue .

Question about PU8901 , P_CHG_ACOK_10 = 6v ( same as P_CHG_REGN_20 voltage , no voltage divider !! ) i change it with BQ24780S same acok voltage !

What ivoltages i must verify too !!

Thank you

Boardview ---> https://www.badcaps.net/forum/showth...42#post1249442

[mcplslg123]

Re: Asus X542UQ no display

P_CHG_ACOK_10 = 6v-This may be ok as REGN is used as pullup for ACOK and there in voltage divider involved.

R0401 should be checked for DRAMRST#.

Bios flashed is clean me and known good?

If yes, then i'm afraid this may be cpu fault.

PS:Worth checking with another flash drive also.