Acer nitro a515 dead

[String2016]

I need help on this acer nitro la-h501p, at first 19v missing it drawn 0.159 on bench lab and the chip pu301 sy8288b is getting hot, so i replaced the chip and now its taking 0.001 which is fine , but the problem is missing 3.3v and no voltage 1.8v on the bios chip, also no voltage on PL1101 COIL supposed to have 1.0v and also there is no voltage PU1101 chip, anyone can help me on this please where is next to check?Attached is the schematic and boardview


https://www.badcaps.net/forum/showthread.php?t=91811

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[String2016]

Re: Acer nitro a515 dead

after replacing pu301 check each pins pin2-5 in=19v pin9 PG=0v PIN17 LD0=0V pin14 out =0v does this chip functioning?there is no pg and ldo

[String2016]

Re: Acer nitro a515 dead

anyone can help on this please pin 11 and pin12 en1 en2 no voltage also

[lapfix]

Re: Acer nitro a515 dead

As you know if The chip don't get the enable signal so he can't generated the alw voltage.
But the 3VL must be present , check pin 17 for short to GND..

At page 5 , it's mentioned that the 3VALW is coming after pressing power button .
But you must find 3VLP /EC_on and 5valw..so uou know what to check now .

Can you give us PQB11/PQB12 voltages = D/S/

[String2016]

Re: Acer nitro a515 dead

no short to ground in pin17 PQB11 AND PQB12 are botth good D=19 S=19 G=24V both mosfet

[lapfix]

Re: Acer nitro a515 dead

Check KB9022 basic requirements

[String2016]

Re: Acer nitro a515 dead

+3VLP_LPC=0v
+3VLP_EC=0v
EC_ON=0v
ON/OFFBTN#=0v
EC_RSMRST#=0v

there is no voltages also all the resistor and capacitor on kbc area

[String2016]

Re: Acer nitro a515 dead

i think the voltages not reaching on kbc but PRB4 resistor both sides have 19v

[Sephir0th]

Re: Acer nitro a515 dead

So ENLDO_3V5V isn't present and you can't find any short at the Inputs/Outputs of the 3V/5V Controller?

Then Follow the Rail and Check PR301 and PR302. LDO Enable comes from there via simple Voltage divider.

[String2016]

Re: Acer nitro a515 dead

@sephiroth i cannot find pr301 and pr302 located on the board because the one uploaded board view i got here also in this forum by smdflea cannot open by openboardview and boardviewer

[String2016]

Re: Acer nitro a515 dead

does this two resistors connected to pin 11 of pu301?

[Sephir0th]

Re: Acer nitro a515 dead

Yes they do with one Side. You could try "beep mode" of Multimeter. And regarding your PN. atm i have No Access to the bureau, so i can't Check for you until this evening.

[String2016]

Re: Acer nitro a515 dead

i found it beeping on pin 11 of pu301 here is the image and it measures only 120komhs

[Sephir0th]

Re: Acer nitro a515 dead

Other Side of this Resistor is connected to GND? Should be PR302 then and also fine. If you want an exact measurement, you have to lift the Resistor from one Pad.
Tbh i'm actually more interested in PR301 which is connected to 19V-Rail

[String2016]

Re: Acer nitro a515 dead

the second resistor on the pic which one side is connected to ground

[String2016]

Re: Acer nitro a515 dead

does this first one resisitor on the pic is the pr301?does this bad?

[String2016]

Re: Acer nitro a515 dead

the second resistor also the other side is connected to vin of the ic pin2-5

[Sephir0th]

Re: Acer nitro a515 dead

I'm Not convinced you found the right Resistors. Share clear Pic of this area without your markings and where i can clearly See the rails.

[SMDFlea]

Re: Acer nitro a515 dead

@sephiroth i cannot find pr301 and pr302 located on the board because the one uploaded board view i got here also in this forum by smdflea cannot open by openboardview and boardviewer

Sorry,the boardview software has been added to the thread,its called Megaton BV Tool .Open the BRD file and press the V key on your keyboard to show the part numbers.

https://www.badcaps.net/forum/showthread.php?t=91811

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[piernov]

Re: Acer nitro a515 dead

Looks to be the same format as Landrex TestLink (used by Apple) and opens fine with OBV and FlexBV here.