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HP 15-n051su (Quanta U93 DA0U93MB6D0) does not power on...
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latitude [ 22 янв 2017, 21:55 ]
Заголовок сообщения:  HP 15-n051su (Quanta U93 DA0U93MB6D0) does not power on...
Hello guys,
I have this mobo /and whole notebook/ for diagnostics /and repair if I can :)/. There is no schematic for U93, so I'm using U72
DC-JACK is broken so I guess there are 19V on AD_ID line.
3.3V/5V - RT8223P was very hot, so replace it with TPS51125.
Replace dcjack cable. When plug adapter, orange diode blink for a second and that's it. When pressing power button, voltage drop form 3.3 to 0.
I try to check AD_ID line. I found R336 and replace it, but I can't find R344 and D8 diode. On R336 I have 1.08V at one side, and 0V on other side. Can someone tell me where is R344 located /if it's present on this board/

Some measurements:

---------------------------------
IT8528E:

11-0
21-3
24-3.4
25-3.4
26/50/92/114/121-3.4
74-0
110-3.4
111-3.4
123-2.2
124-3.4
125-0, even after pressing power button
127-0

------------------------------
BQ24728 /pu2/-charger

20-19.5
4 /acdrv/ 25.5 ???
5-3
6-2.7
8-3.4
9-3.4
------------------------------
3/5VPCU RT8223P /replace with TPS51125

8 /vreg3/ - 7.8 ???
17 /vreg5/ - 5
13 /en0/ - 3.2
16-19.5
PL20-5
PL21-3.3

I'm wonder what are these 7.8V on vreg3?
On PQ21 I have 19.5/19.5 and 25.5V?

Quanta U72 schematic attached if someone can help. Thanks in advance.
latitude [ 26 янв 2017, 23:49 ]
Заголовок сообщения:  Re: HP 15-n051su (Quanta U93 DA0U93MB6D0) does not power on...
Gooooood evening :)
Little update. after replacing IT8528, dcjack led lights white, notebook power on, but there is no picture and fan no spinning.
I check PU9 /NB671, code on the chip AEAD 748, I think it's that: https://www.monolithicpower.com/Desktop ... ent?id=823
I check this from Quanta 92 schematic, because on Quanta 72 i think it's different IC.
On pin 13 must be VRON from IT8528 /same signal goes to cpu power/, but there is 0v on NB671. VIN present. VRON /3.3v/ goes to NB671 through resistor PR282, but I can't find it on the board.
Can someone help me where to find it?
For testing - make a bridge from IT8528, pin 83 to NB671. After that, NB671 generates 1.2V, but still no picture on the screen.
I need an advise..
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