HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

[CornholioGSM]

Hello,
can anoyne help me please? I have here one dead HP with Quanta 81 mainboard.
Looks completelly dead - no light near dc connector. It uses BQ738.

results - measured without battery:
1/ACN - 19.8V
2/ACP - 19.8V
3/CMSRC - 19.8V
4/ACDRV - 24.8V
5/ACOK - 3.2V
6/ACDET - 2.8V
7/IOUT - 0V
8/SDA - 3.3V
9/SCL - 3.3V
10/ILIM - 3.3V
11/BATDRV - 3V
12/SRN - 3V
13/SRM - 3V
14/GND - GND
15/LODRV - 0V
16/REGN - 6V
17/BTST - 6V
18/HIDRV - 3V
19/PHASE - 3V
20/VCC - 19.8V

Authorised service returned this laptop as "unrepairable". Visually mainboard looks clean and i cannot see any blown part. ONLY what can i see is some solder flux around both bios ics u13 and u22...but this is maybe normal.

Thx

[Techtiger]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

What are the voltage on PU11 PU12 all pin? Make sure RTC section is ok D13

[CornholioGSM]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

...sorry for deelay. On Pu11 i have
1VIN : 19.8V
2PGND : G
3NC : NC
4PG : 0V
5CLK : NC
6LDO : 3.3V
7VOUT : 0V
8,9SW : 0V
10BST : 4.8
11VCC : 5.1V
12ENLDO : 5.5V
13EN : 0V
14AGND : G
15,16SW : 0V

PU12 is same with LDO 5V

...now trying to find D13

EDIT : my mobo is without D13 area...only free pads

[Techtiger]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

S5 ON is missing to enable those 2 IC to output +3VS5 +5VS5,Now you have to check requirements of KB3940QF pin 101 122 19 64 you have to use a Original Adapter

[CornholioGSM]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

hmmm and S5_ON is connected directly to U15 so is needed to change KB3940Q and reprogramm it?

...maybe will be better to put this mobo into trash

[Techtiger]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

hmmm and S5_ON is connected directly to U15 so is needed to change KB3940Q and reprogramm it?

...maybe will be better to put this mobo into trash

No need of changing SIO for the moment but might have to flash Bios but I need the voltage on SIO some pins supply to say it

[CornholioGSM]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

so tell me needed pins. BTW thank you for help

[Techtiger]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

KB3940QF pin 101 122 19 64 you have to use a Original Adapter

[CornholioGSM]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

With original 90W adapter 101 - 0V , 122 - 0V , 19 - 3.3V , 64 - 0.8V

[Techtiger]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

trace back AD_ID near R364 what voltage you get both side of the resistor? in SIO pin 19 90 95 37 93 voltage as you press the power btw with out pressing the power btw ?

[CornholioGSM]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

...i will measure more tomorrow.
util now was all measured without pwr pressed.
Dont forget that i dont have any light (or short light)on dc connector. with or without bat connected.

[CornholioGSM]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

Soo ...on R364 i have 0.80V / 0.79V.
On SIO without pwr pressed i have 19 : 3.37V, 90 : 3.37V, 95 : 0V, 37 : 3.37V, 93 : 0V

With pwr press i have 19 : 0V, 90 : 0V, 95 : 3.36V (and stay after release pwrsw), 37 : 3.32V , 93 : 0V

[Techtiger]

Re: HP 15-N008sc (Quanta 81-daou81mb6c0-rev-c) *DEAD*

Soo ...on R364 i have 0.80V / 0.79V.
On SIO without pwr pressed i have 19 : 3.37V, 90 : 3.37V, 95 : 0V, 37 : 3.37V, 93 : 0V

With pwr press i have 19 : 0V, 90 : 0V, 95 : 3.36V (and stay after release pwrsw), 37 : 3.32V , 93 : 0V

with 90W power supply R364 0.80V is fine but depands on the platforme some Mobs 3.3V
pin 93 EC_POROK 0V (this shoul be 3.3V) to send info to PCH, can you check again pin 37 ECRST# when you press PWBT this voltage should go 0 to 3V or trace it back R427 47k test 47k is ok or C655 is good or not, can you back up the old BIOS bin and flash bios ?