HP 17-bs025cl

[mazloum]

hi
can this laptop be converted from discrete to uma?
thanks:
HP 17-bs025cl

[SMDFlea]

Re: HP 17-bs025cl

motherboard part number ?

[mcplslg123]

Re: HP 17-bs025cl

is it LA-E791P??. If so removing just the graphics coil will work in uma mode.

[lapfix]

Re: HP 17-bs025cl

Same motherboard for HP 15 250 G6 with Disc graphic.

No picture ( there's a backlight ) at intern/extern , try bios/clean me same issue

EC :
RSMRST# pin 100 = 3.2v
6 SLP S3# = 3v
115 LID SW# = 3.2v
110 AC_IN = 3.2v
13 = PLT_RST# = 3.321v

This voltage at the different coils :
plz1 = cpu core = 0.931
plg1 = integrated graphic = 0.692
pl301 = 3v alws
pl302= 5v alwas
pla1 = 1.05v
pl1001 = 1.05v
plm1 = 1.2v

So , can i conclude that it s a graphic issue !

[mcplslg123]

Re: HP 17-bs025cl

LPC lines checked?? Edp cable replaced??

[lapfix]

Re: HP 17-bs025cl

Thank you mcplslg for your advises.

No schematic/boarderview available ..i will try another EDP cable ...for LPC i think it needs oscilloscope!! don't have for the moment

[mcplslg123]

Re: HP 17-bs025cl

Why not get the kbc datasheet from another schematic and start checking LPC pins on KBC. You can somehow check them with simple DMM. Dont give up without giving a hard fight.

[lapfix]

Re: HP 17-bs025cl

i know and i use another schematics just to know the pinout of KB.

For LPC_AD0/1/2/3 = 3.3v

The consumption is : 0.700 amp

[lapfix]

Re: HP 17-bs025cl

Update : i try another motherboard with the same screen and it works , so the EDP cable works fine

[mcplslg123]

Re: HP 17-bs025cl

@lapfix, with LPC readings ok and PLT_RST present-there are hardly any options left without schematics. BUFO_CPU_RST is something to watch for but not possible without boardview. So seems like end of story. May be someone else have any idea. Still do check the following:
01.UC5-pin8-9 for 1.8V & 13-14 for 1.0
02.UC6-pin6 for 1.0V
03.JU22 for VCC_GT

However, i do beleive all the test points above are having requisite voltage.

Numlock on usb kbd glows??

[lapfix]

Re: HP 17-bs025cl

Hello my friend
No UC5/UC6/Ju22 on this motherboard.

No reaction from KBd

Try to convert it !!

Update :
75 = AD_ID = 0.649 with psu
75 = AD_ID = 0.378 with 45W

[mcplslg123]

Re: HP 17-bs025cl

I'm 100% sure there is UC5/UC6 on LA-E791P mb. Its located near PCH part of SOC

[mcplslg123]

Re: HP 17-bs025cl

Both are part of DC-DC conversion circuit. Your mb is dis??

[mcplslg123]

Re: HP 17-bs025cl

If NUmlock is not glowing on kbd, your mb is not posting. So do probe RAM circuit .PG present or not on RAM PWM?? As far as i remember, removing the two gpu coils make it UMA.

[lapfix]

Re: HP 17-bs025cl

Sorry my friend
UC 5 :
pin8-9 = 1.794v
pin13-14 = 0.989v

UC6 :
pin6 = 0.989v

yes it's a disc

For Ram PWM = PUM1 i m searching for Datasheet = 4B=4H

[lapfix]

Re: HP 17-bs025cl

If i m right ; PUM1 is RT8207P.

Pin 11/12 = VDD and VDDP = 5V
Pin 7/8 = S3/S5 = 3V
Pin 20 = VTT = 0.597
Pin 16 = PHASE = 1.198
Pin 10 = PGOOD = nothing stable !

[mcplslg123]

Re: HP 17-bs025cl

Yes PUM1 is RT8207P. Your measurements seems good. PG of ram ic is not used in this mb-i rechecked it as i've one repaired mb in hand-so sorry my mistake. Did you try converting it to UMA??

[lapfix]

Re: HP 17-bs025cl

Hello my friend

Yes removing PLV1/PlV2 but same issue , try the clean me bios same too, try another third bios still the same issue.

So seems like end of story.

[mcplslg123]

Re: HP 17-bs025cl

Yes seems like end of story and i dont have any more idea.

[lapfix]

Re: HP 17-bs025cl

Thank you for all your help