Acer E1-531 won't start

[senchire]

Hello fellows, I got this acer 3 days ago to exchange the housing (it worked then). After replacing the housing I saw that the laptop would sometimes show that the battery is charging sometimes not.
Now I am stuck with a dead laptop O.o.
So what I have seen is that the laptop gets only 6V (trough the dc in) also have PQ7 and PQ12 heating like crazy.
What would be the logical next step?
Its the amd board, and as soon as I plug in the adapter the CPU goes from 0C to 50+.

[polytek]

Re: Acer E1-531 won't start

please post the mobo number; or the schematic diagram

[senchire]

Re: Acer E1-531 won't start

Here is the mobo number Acer E1-521 (seems like I wrote the header wrong)
Q5WT6 LA-8531P Rev 2.0.
Didn't find any schematic. What weird is that by plugging adapter in the CPU gets hot. Could be a short near the battery outlet or on PQ7/12 since they also get very hot.

[polytek]

Re: Acer E1-531 won't start

this schematic can help you
can you post photo of the mobo both side top and bottom

[senchire]

Re: Acer E1-531 won't start

Thanks for the schematic, now here are the pictures from the motherboard.
I am currently thinking since (when I plug the adapter in) the CPU starts heating, it will be difficult to measure anything since I risk killing the CPU?

The pics as following (2 from sides and 1 on the PQ7 and 12 which are heating).

[dj_ricoh]

Re: Acer E1-531 won't start

so?
did you test those fets? are they bad or there is a short on the pads?

[senchire]

Re: Acer E1-531 won't start

Just took off the PQ7, pads aren't shorted.
Wanted to ask, never tested P-channel fet's is it same as with n channel (puting + to drain and - source to test if the device is off in diode mode).
Frankly my diode beeps all the time, which didn't happened with n channel shall that mean the fet is shorted? (When - is on Source and + on Gate I get 0034 on my multimeter while in other cases its 0 but with beeping means there is some short right?)

[senchire]

Re: Acer E1-531 won't start

Just tested PQ12 again pads not shorted, and this time it behaved like it should (not like PQ7) both are P channel. So I can safely assume that the PQ7 was shorted.
Could I exchange the AO4409 with AO4407? Looking at the data sheets they are nearly the same.

[ktmmotocross]

Re: Acer E1-531 won't start

yes, but 09 is 14A and 07 is 12A

[senchire]

Re: Acer E1-531 won't start

Will that affect the work in any way?
I got no AO4409 will order some but for testing I'd use this one, don't wanna blow something after it.

[dj_ricoh]

Re: Acer E1-531 won't start

No.
If the notebook pass 10A in consumpiton it will burn something inside.
In my life i saw a alienware that had 10A adapter and i got a fujitsu that takes 8.5a and a qosmio with 6a.

[senchire]

Re: Acer E1-531 won't start

Ok I've put the AO4407, now it passes the voltage normally the CPU isn't getting hot and I get 19V through the dc-in. But it still doesn't get any voltage on the power on button (0.4v).

[dj_ricoh]

Re: Acer E1-531 won't start

ok! that`s good!

now lets go to the next step!
RTC battery needs to be over 3V.
Next find U103 a,k,a BIOS , he needs to get 3v on PIN 8; that`s VCC.

If the bios somehow its bad, the actual chip or the software inside it will not power.
if you got a scope you can actually see if the chip its ok or not. if not take the chip down reprogram and voila!

[dj_ricoh]

Re: Acer E1-531 won't start

o snap!

there is on trick here!

i was reading to schematic and there is a place for this board to see if you got 3VALW.

that voltage with 5VALW its critical .

so the 3VALW you can see it on the ribbon with the power button.

that voltage powers up the LED stand by that the adapter its ON .(with +3VS)

So first pin on the connector from the power button you need to have 3V.
Do you got it? what voltage you got on all pins from the power button connector?

[senchire]

Re: Acer E1-531 won't start

Ok regarding the voltage on the pins for pwr button :
P1 : 0.001 (or 0)
P2 : 0
P3,P4 : 0
P5: 0
P6: 1.6V
P7: 0
P8 : GN
Just checked the bios and on VCC I got no 3V, seems like I am missing the +3VALW across the whole board.

[dj_ricoh]

Re: Acer E1-531 won't start

ok!

now lets find PU2 everything that is ALW is there!

you got there 2 coils PL4 and PL5

voltage on those coils and that PU2, and resistance on the coils; if you can lift them up then do resistance on pads TO

[senchire]

Re: Acer E1-531 won't start

Ok on PU2 the GND is on 15 did a measure on VIN and OUT and I've 0V.

[dj_ricoh]

Re: Acer E1-531 won't start

measure all the pins!

and resistance on the coils with ground and voltage.
if you can take out the coils will be nice!

[senchire]

Re: Acer E1-531 won't start

Ok before I take off the coils, they have both 0.3 Ohm. Regarding the PU2 it has only on 12 and 20 pin 0.8v rest is 0.
When I lift the coils shall I put some wire to make resistance or leave it blank?
Ok I lifted the PL4 and have still Only 0.3 Ohm, while the resistance on the board (on the pads) is 31.2K Ohms.
Looking at the datasheet from PCMC063T-4R7MN their typical value is 37mO could this indicate a faulty one?

[dj_ricoh]

Re: Acer E1-531 won't start

Ok before I take off the coils, they have both 1 Ohm. Regarding the PU2 it has only on 12 and 20 pin 0.8v rest is 0.
When I lift the coils shall I put some wire to make resistance or leave it blank?

on coil you got 2 pads --|| ||-- so black probe on ground and red probe on each pad . after that you see where there is more ohms and that side its shorted