Need help HP HSTNN_Q996 laptop... battery only power on but not on Adapter 19v ok no short ...

[duckmaster]

History of this laptop water damage... no power at first 19v CSR pin not present after replace first and 2nd mosfet.. 19v present... now its not turning on adapter present with battery not charging
but if battery only turns on... the corresponding voltages of the BQ24780s

Schematic used: Qanta Y0F MB_DB1

HP
BQ24780S ADP only test
CSR test
Before PIN 19.71 after pin 19.71
ADP_ID Limit signal 800mv

VCC 19.70v
ACN 19.70v
ACP 19.70v
ACDET 2.750v
ACDRIVE 25.45v
CMSRC 19.67v
I_SET 19.7v
BQPROCHOT 0.700v
ACOK 3.38v
REGN 6.12v
BQIADP 100mv to 129mv
CLK 3.39v
DATA 3.39v
BQILM 3.38v
CMPIN 1.56v
CMPOUT 3.3v
CMPON 0.76v
BQHDRV 197mv
BQLODRV 000v
BATDRIVE 227.7mv
BQPHASE 197.2mv

hope someone can enlighten me why it is not working on adapter on and not charging... powers on battery only...

[mon2]

Review:

1) adapter rating
2) dual diode that is often on the vcc pin of the charger ic
3) the power adapter ID voltage to identify the power rating

4) Remove all power. Meter in resistance mode. Measure the resistance directly on the charger IC for the ACP / ACP pins. We are wanting to confirm the full path resistance of the adapter current sense circuit. The voltage measurements on ACP/ACN look ok but let us confirm this path as well.

reference:
https://www.parkytowers.me.uk/thin/hp/hp_psu.shtml

Update this thread with your progress.

[duckmaster]

good day sir... thank you for ur reply... this are the test i took...

adapter rating 65w 19.5v 3.33Amps

adapter voltages when not connected to the motherboard
3pins black= gnd
white=ad_id = 18.88v
red=positive = 19.71v

adapter voltages when connected to motherboard
ADP_id= 0.800v red= 19.71v
is ADP_id correct voltage?

REsistance between Adpter pin white and red not connected to motherboard
380.8koms
when connected to motherboard
31kohms

Resistance test ACP/ACN
Gnd to ACP/ACN = 23Mohms and going down
CSR to ACP/ACN = 0ohms

Voltage test
ACP/ACN = 19.71v

AD_ID(LIMIT_SIGNAL) circuit test
AD_ID = 0.800v
ADP_ID_CHK(SIO) = 000v
I_SET (SIO) = 19.7v
ADP_A_ID (SIO) = 0.599v
OCP_A_IN (SIO) = 000v

Is Novuton NPCE576HA0YX_QFN the SIO of this board sir?

[duckmaster]

is there anyone here who have an idea what is the culprit... is it the SIO ? Novuton NPCE576HA0YX
if the SIO is the culprit then where can we buy the chip with program installed?
..
... tried replace with new adapter, same...
tried change BQ... same status...

[mon2]

With battery only (no power adapter) - test to see if you see any voltage on the DCin mosfets that are between the power adapter and the main power rail. We are testing to see if the DCin mosfets are leaking. Often (as per the sticky above by @piernov) the DCin mosfets are the suspects for cases such as yours.

[duckmaster]

With battery only (no power adapter) - test to see if you see any voltage on the DCin mosfets that are between the power adapter and the main power rail. We are testing to see if the DCin mosfets are leaking. Often (as per the sticky above by @piernov) the DCin mosfets are the suspects for cases such as yours.

thank you for ur reply...

testing 1st mosfet
Drain 2.6mv
Source 64.3mv
Gate 0.3mv

testing 2nd mosfet
Drain 11.39V
Source 64.3mv
Gate 0.2mv

CSR 11.39V

these are the test taken... thank you.. do you think there is a leak?

[duckmaster]

Update...

Issue is persistent no found solution... decided to return to owner...

thanks to the people who share their ideas... god bless..

you can close the thread..