Acer MB: B5W11 LA-E061P DCIN problem

[ziko07]

Hi

I have this laptop
MB: B5W11 LA-E061P
When put dc power on first FET has 19v on pin-5 but after that on +19v_P1 has 0.9v only (fet not switched on) also on main power rail only 0.9V
With battery main power rail is ok, 16V and laptop starts ok
If I short drain-source on first FET then I have 19v on main rail, battery charged but FETs for charging goes very hot
Any help?

Thanks

P.S. Just to mention that not have LDO on 3/5alw becouse no voltage IN-19v on drivers ICs, only 0.9v

[SMDFlea]

Re: Acer MB: B5W11 LA-E061P DCIN problem

Review these threads

Laptop battery charging circuit
https://www.badcaps.net/forum/showthread.php?t=90356
2.1.3. Shorted DC-in MOSFET

Beginner's guidelines
https://www.badcaps.net/forum/showthread.php?t=88758
2. What not to do
2.6. Never randomly bridge MOSFETs/fuse/components

.

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

Thanks for links, I changed both mosfet and still same, even 7002 small fet and still same
+3VLP missing (but missing becouse no +19v on ICs)

i also see not to short mosfets, but Sorin on youtube did many times , but will follow rules not to do again
Regards

[mon2]

Re: Acer MB: B5W11 LA-E061P DCIN problem

Attach the power adapter. Carefully measure the voltage to ground of each pin on the charger IC.

Post each measurement with the pin numbers for a review.

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

1=0.9v
2=0.9v
3=/
4=/
5=/
6=2.6v
7=/
8=/
9=/
10=/
11=0.9v
12=0.9v
13=0.9v
14=/
15=/
16=6v
17=5.8v
18=0.9v
19=0.9v
20=18.8v

DCIN=19.2v on connector

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

this is battedry only connected:
1=16v
2=16v
3=/
4=/
5=/
6=/
7=3.3v
8=3.3v
9=3.3v
10=0.8v
11=16.5v
12=16.5v
13=16v
14=/
15=/
16=/
17=15.8v
18=16v
19=16v
20=16v

batt=16v on connector

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

Also PQ304
G,S,D ame voltage, should be on gate at least +5v more then source?

I removed this fet and now 19v is ok via dcin
solved,replace that fet and now laptop on,batery charge... source to drain was shorted on fet
tnx to all

[Sephir0th]

Re: Acer MB: B5W11 LA-E061P DCIN problem

No REGN in battery mode can not be true. And if one measurement is wrong, we cannot trust in any of these measurements since it would mislead the whole troubleshooting process.

It is also in your interest to redo all 40 measurements till we can be sure you did it right.

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

I tried all measurements to be good,on that diode not has voltage in battery mode, its big diode so easy to test voltage....but maybe you right...maybe gnd moved or similar but laptop is ok now
Tnx
.p.s. I wait new videos on YouTube

[Sephir0th]

Re: Acer MB: B5W11 LA-E061P DCIN problem

You will receive them.

So issue solved. Do you mind to enlight us poor technicians who not know what happened in the end?

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

By datasheet REGN ldo is 6v when ACDET is above 0.6v
ACDET has voltage divider from +19v_vin , which is not present without adapter.

[ziko07]

Re: Acer MB: B5W11 LA-E061P DCIN problem

You will receive them.

So issue solved. Do you mind to enlight us poor technicians who not know what happened in the end?

Is it just joke?
PQ304 was shorted drain to source l¹

[Sephir0th]

Re: Acer MB: B5W11 LA-E061P DCIN problem

Oh damn, missed Post #7. Then nevermind please...