I realy NEED your help Acer Spire 3820T

[dj_ricoh]

it does not power at all.
i`m stuck on pic 1 at U27 with voltage output.

VOUT1=0 VOUT2=0

vout1 and vout2 needs to be outputing before after pressing the button?
page 42 in the laptop schematic and the RT8223B

[loser18]

Re: I realy NEED your help Acer Spire 3820T

Think the fastest way to determine where the fault could be, is to post voltages of all pins...

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

Think the fastest way to determine where the fault could be, is to post voltages of all pins...

the rest its 0

on page 47 its ISL88731A almost everything its ok
and on U3 gate pin4 and q18 i injected up to 19v and nada nothing.
was hoping to heat something

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

U3 pin1,2,3 19v gate 1v and rest 19v

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

on page 40 on that isl u39 i`m stuck cuz almost everything its 0

[loser18]

Re: I realy NEED your help Acer Spire 3820T

I would check L45,L40 & all pins of U27 against ground for shorts...
Also check voltages at SIO (u17) pin 19,46,76,88 & 115...

[loser18]

Re: I realy NEED your help Acer Spire 3820T

Don't worry about other regulators for now...

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

I would check all pins of U27 against ground for shorts...
Also check voltages at SIO (u17) pin 19,46,76,88 & 115...

ok
they all shorted to ground , even the fets around u18 and 15
every thing that does not have a value on the first picture its 0 and shorted to ground
dammm

[loser18]

Re: I realy NEED your help Acer Spire 3820T

You need to desolder both coils & check which pads are shorted...

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

you are referring to L23
and the other one?

[loser18]

Re: I realy NEED your help Acer Spire 3820T

Also looks there's some residue of flux around fets and U27...Where did you get that mobo?

[loser18]

Re: I realy NEED your help Acer Spire 3820T

you are referring to l23
and the other one?

l40 & l45

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

l40 & l45

thank you.
tomorrow its bank holiday only after i can desolder them.

is there a case for each side?

[loser18]

Re: I realy NEED your help Acer Spire 3820T

Technically yes...
You may have 5V_PWR, 3D3V_PWR rail & U27 shorted or/also fets...
That's why I've been asking where did you get mobo...
Last week I bought some laptops from bankrupt IT shop ( now i know, why they bankrupted, lol) & every one has been badly reworked, many rails shorted on one he reflowed CPU socket & melted plastic(such a moron)...

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

the actual notebook was working and it just stop working

[loser18]

Re: I realy NEED your help Acer Spire 3820T

Think it would be U27 or fets broken...

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

a friend of mine sold it and came back to me to help him.

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

Ok i remove those coils !
the short its gone.

brb i forgot the readings.

[dj_ricoh]

Re: I realy NEED your help Acer Spire 3820T

starting from pin1 ENTRIP1 to pin 24 VOUT1
Ground to each pin
1: 58.9 kOhm
2: 16 kOhm keep rising
3: 115.3 kOhm
4: 0.6 Ohm and it beeps with continuity
5: 4.7 kOhm
6: 59.1 kOhm
7: 474.5 kOhm
8: 54 kOhm
9: 1.84 MOhm
10: 520 kOhm rising
11: 520 kOhm rising
12: 534 kOhm
13: 111 kOhm rising
14: 54 kOhm
15: 0.7 Ohm PGND
16: 440 kOhm going down
17: 203 kOhm
18: 12.25 kOhm
19: 550 kOhm
20: 500 kOhm rising
21: 500 kOhm rising
22: 2 MOhm rising
23: 243 kOhm
24: falling and rising fro 500 kOhm till 1 kOhm the goes back up up and down up and down.
i think its charging and discharging the caps.
so?
should i replace it? ?

[atsio]

Re: I realy NEED your help Acer Spire 3820T

Check if short on rail on the + side of TC22 and TC23