Repareer je spullen Gemeenschap Winkel

Repair guides and support for the laptop line of Acer's Aspire series for casual home and business use.

1189 Vragen Bekijk alle

Opties

Acer Aspire A514-52 no power after LCD replacement

I replaced the LCD on an Acer Aspire A514-52 and since replacement the device will not turn on.

I've tested the power jack with the multi-meter, and when plugged in it gets 19.41v, but the battery charging light does not light up.

I've unplugged the battery and charger and held the power button, I've tried booting direct from mains, nothing happens.

Could it be something I've done? I have replaced hundreds of these Acer LCD's and never had an issue like this.

Any advice would be greatly appreciated.

Beantwoord deze vraag Dit probleem heb ik ook

Is dit een goede vraag?

Ja Nee
Score 1
6 opmerkingen

Are there any lights, or fan noises that indicate that the device is powering on?

door

@jmehnert nothing at all.

door

And the battery was fully charged before the repair was made, and was seated correctly during the reinstall process?

door

@jmehnert about 50% and absolutely

door

@oscart

Just verifying that you disconnected the battery from the motherboard before removing/replacing the LCD panel?

What is the make and model number of the motherboard as printed on the motherboard?

door

1 commentaar meer tonen

Voeg een opmerking toe

1 Antwoord

Filteren op:
Meest nuttige Nieuwste Oudste
Het nuttigste antwoord

Opties

Hi @oscart,

Is there any voltage appearing on the battery's red and black wire connection pins on the motherboard (with the battery removed) when you connect the charger?

I can't find a free download online so you may have to purchase the schematics to find out what's wrong.

Although I'm not certain that I linked the correct one as these are for an NB8513_MB_V3 motherboard and not for the model number you quoted. Nothing shows up when searching for an NB851_NB_V3 and the one I linked shows up a lot when searching for an "Aspire A514-52 motherboard schematic".

There are other results when searching for an NB8513_MB_V3 schematic or the laptop model number but mostly they're just for BIOS.bin files or boardview files and not the schematics.

Hopefully it is the one or it is close enough to help.

Was dit antwoord nuttig?

Ja Nee
Score 3

2 opmerkingen:

Sorry, it was meant to be MB, the N was a typo.

I'm reading .22v on the pins where I believe there should be 3v.

door

@oscart

The best way is to start at the DC-In point and work forward to find out why there is no power being detected that would turn on the charge light in the laptop.

The input power comes in at 19.4V but is regulated down to all the necessary voltage values required and there are a few. I don't know the circuit but in other laptops there is also 12V, 5V 3V, 1.8V and 1.5V as well.

These may not apply in your laptop but the point I'm making is that the input is detected and some voltages regulators (power mosfets) are switched on to supply these voltages. Initially only the 3V supply and the one necessary to charge the battery).

When the laptop is started the 3V supply to the power button is fed to the motherboard chipset (south bridge - which is also powered) which turns on other regulators to power the other components.

Sorry if you know all this but that is why I suggest starting at the input

Mostly the schematics show the individual voltage regulator circuits on a power supply page but maybe not with Acer. I don't know They do in Lenovo, and HP

door

Voeg een opmerking toe

Voeg je antwoord toe

Oscar T zal eeuwig dankbaar zijn.
Weergavestatistieken:

Afgelopen 24 uren: 1

Afgelopen 7 dagen: 1

Afgelopen 30 dagen: 4

Altijd: 204