Repareer je spullen Gemeenschap Winkel

In June 2017 Apple updated its 13" MacBook Air with a newer Broadwell Intel Core i5 processor, resulting in slightly increased performance and battery life.

421 Vragen Bekijk alle

Opties

Weird backlight issues after liquid damage

I’m working on a 2017 MacBook Air that had some liquid damage on the power board (the separate board that has magsafe, USB, and aux).

At first it would not power on at all but I could see immediately there was some sticky residue around the solder points of the MagSafe connection and just cleaning that up got the system running but with no backlight.

I started investigating the usual suspects; backlight fuse, driver etc. and everything seemed to be OK and there was only some minor liquid residue with a little bit of corrosion on the under side of the board but it all cleaned up easily. Now the really weird thing is I can actually get the backlight working but it’s intermittent at best unless I boot it up with the battery unplugged.

I do this by holding the power button for 10 seconds then attaching the MagSafe and continue holding power button for 10 seconds then letting go. After that the backlight works consistently while in this mode even if I plug in the battery and restart it keeps working until I do an SMC reset.

The issue in this mode is the fan is always at 100% and the battery is not detected but it does run without the charger attached. If I run a system diagnostic in this mode I get error PFM001 (SMC error) and PPT001 (no battery) but if I run it in normal mode (when the backlight doesn’t work) there are no issues found.

Could the battery be causing this issue? There is a battery service alert while when running in normal mode. The fact that the backlight works without any issue in the other mode seems to show there are no problems related to any LCD components. Could it be the SMC? Is this other mode I’m referring to just a mode where the system bypasses the SMC?

The only other issue with the system is the speakers are disabled in the OS. They do work because I hear the chime sometimes when booting but usually not, I thinks it’s only once after doing an SMC reset.

Any help would be great, I’ve never seen this before and I’m very confused :S Thanks!

Beantwoord deze vraag Dit probleem heb ik ook

Is dit een goede vraag?

Ja Nee
Score 0

4 opmerkingen:

What is the motherboard number?

door

This is the model: https://everymac.com/systems/apple/macbo...

And the motherboard SN is FV9732202LQJ22LAZ, is the motherboard number the first 3 of the last 4 here?

door

@honakrisi - I think what you where asking for was the logic board number 820-xxxxx

This system should be 820-00165

door

Thanks Dan! I was looking for the 820 number ;)

door

Voeg een opmerking toe

1 Antwoord

Filteren op:
Meest nuttige Nieuwste Oudste

Opties

You really need a set of schematics and boardview drawings so you can trace out the logic on the logic board. This is for most folks brain surgery and beyond a DYI project, and you still need to proper tools and access to the SMT device parts.

Maybe it would be just easier (and cheaper) to replace the logic board MacBook Air 13" (2017) 1.8 GHz Logic Board here’s the guide to put it in MacBook Air 13" Early 2018 Logic Board Replacement

MacBook Air 13" (2017) 1.8 GHz Logic Board Afbeelding

Product

MacBook Air 13" (2017) 1.8 GHz Logic Board

$299.99

Was dit antwoord nuttig?

Ja Nee
Score 0
Voeg een opmerking toe

Voeg je antwoord toe

David zal eeuwig dankbaar zijn.
Weergavestatistieken:

Afgelopen 24 uren: 0

Afgelopen 7 dagen: 0

Afgelopen 30 dagen: 0

Altijd: 32