Aspire 5741z power only on ac

[kingo71]

Hi there, i have a strange issue with this laptop.

It power up only if the ac is pluged in, even the battery will be charged and if i unplug the ac the laptop still working.

Then with only battery doesn't power up.

The board is a LA-5893P

Thank you for any help.

Bye.

[highpulse]

Re: Aspire 5741z power only on ac

seems to me a bad charger IC , or the mosfet related to state open/close of the battery . chek that first , for we can carrier forward for next solutions

[kingo71]

Re: Aspire 5741z power only on ac

Thank you for your answer.

If you already know this board, please tell me what ic to check.
I have checked the pq42, maybe something related to VIN detector?
The battery will charge, but no power on with only battery although the laptop stay on with only battery after power on with ac adapter.

Thank you for any further help.

[lezsimply]

Re: Aspire 5741z power only on ac

have you checked rtc battery?

[kingo71]

Re: Aspire 5741z power only on ac

Yes, seems to be ok, i can check RTCVREF and +RTCBATT and tell you the result

[atsio]

Re: Aspire 5741z power only on ac

Give voltage of PQ53 with only battery connected

[kingo71]

Re: Aspire 5741z power only on ac

Hi, thank you for support.

Well, on PQ53 i have these values:

on pin 1,2,3 the +B (12,38 with my battery)
on pin 4 0V (without ac pluged)
on pin 5,6,7,8 BATT+ (12,38 V)

Thank you in advance for any help.

[kingo71]

Re: Aspire 5741z power only on ac

Any advice?

[atsio]

Re: Aspire 5741z power only on ac

What is the voltage on PQ42 and PU14?