Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

[ss45]

Hi guys

Can anyone identify the Pinout of this ic ?

Initially the board was turning on but no post, so I desoldered bios chip, clean me, reflash.

But since then there is no 3v at power button anymore.
So button doesn't respond anymore

Not sure the cause, there is no short found

Right now trying to trace the cause,
Maybe I knocked off some components ?

maybe this awv thip is the one responsible generating alw voltages ?


Thanks in advance

[JaroTech]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

Everything you need to know about this chip can be found in post #12:
https://www.badcaps.net/forum/showth...hlight=silergy

[ss45]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

Thank you ! On it !

[ss45]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

Well I have got schematic
https://www.badcaps.net/forum/attach...4&d=1651387596

3.3v ia generated by SY8286BRAC en1 signal is tied to 5V_3V_EN

5V is generated by SY8270CTMC en1 controlled by same 5V_3V_EN

Probing at 8270 en1 gives me 3.3v. it is connected to 2.2kohm. probing the other side of resistor also gives me 3.3v. and there is 1MOhm pull down measured with DMM which agrees with schematic.

Here is the funny thing. 8286 en1 pin is somehow disconnected. According to schematic it should be tied to 5V_3V_EN. But it doesn't connect to en1 of 8270.
With DMM, resistance to ground and VCC is more than 20Mohm, basically floating. So 8286 will turn on on its whim, and by touching probe to en1 will momentarily shut 3valw, until en1 slowly creeps back up to whatever threshold that turns on the regulator.

En1 trace of 8286 leads up to a via (yellow line), so it's hard to trace from there. If it indeed follows what's in schematic, did I just somehow managed to delaminate the interlayer connection during removal of bios chip?

[JaroTech]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

Do you have continuity between the two "EN1" directly on the chips (PU301 and PU302)?

[ss45]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

Nope

[JaroTech]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

So put a jumper to connect the two EN1.

[ss45]

Re: Hp Spectre folio no 3.3 unknown ic awvalg awval6 ?

I tried solder en1 to 3v.

Pu301 and 302 are separated far, they are pretty much on the each opposite of the board even though in schematic they are displayed in the same page.

Also 3v_alw feeds to a MOSFET switch to supply 3v_prim but no en signal to this switch. Who knows what else was delaminated in the desoldering process

I will try your suggestion though, just have another work to do first.