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Proxy64 · 2025-06-23T08:06:59+00:00

Fixed !
That was a long adventure, I want to give the shortest feedback as possible, maybe that can be useful for someone.
At first, this laptop went to Acer service in Thailand, they refused it because it was bought in Europe.
Then it went in a local repair service, after 3 months they gave it back, we cannot repaired it.

Then I finally found schematics for this board enzo_mb_n17_KBL_161011.pdf (posted here), this schematics include the missing page 87 !

Like Sephir0th said at the beginning I was in the wrong way.
Reminder of the symptoms: it...

Proxy64 · 2025-06-23T07:12:20+00:00

Here schematics for this motherboard...

Proxy64 · 06-08-2025, 07:09 AM

Sephir0th or of course anyone else.

I'm really surprised it refuses to start if the battery is dead.

Especially since it's not a removable battery!
At this point, do you think a disconnected battery could have an impact on the failure to start?

What do you think about voltages measured (last picture) ?
Thank you for your time...

Proxy64 · 06-07-2025, 10:44 PM

Updated with processor, measured on capacitor, I think mosfet and coil are on the other side
...

Proxy64 · 06-07-2025, 09:08 PM

I'm back to the beginning.
With the battery connected, the battery LED only flashes and nothing else (this laptop has been inactive for 2 years, so I think it's dead).
If I disconnect it, I have the sequence on video: 2-3 times, and it turns off.
I noted the voltages on each coil.
5V is the only one present as soon as the charger is connected.
...

Proxy64 · 06-07-2025, 06:16 PM

Sorry I don’t know what you’re talking about ?...

Proxy64 · 06-07-2025, 07:17 AM

I tried but this pin seems to be broken (pin37).
In this schematic from another, more recent version, but it probably hasn't changed for this connector, there's an inconsistency between the schematic and the table on the right.
According to the table on the right, this would concern the camera, which isn't my priority at the moment, but in the schematic, it would be a +5VS_LGF, which could be more problematic.
...

Proxy64 · 06-07-2025, 06:14 AM

Humm really interesting thank you!
So I went back to take the measurement with more precision, my owon oscillates between 0.10-0.12 ohms
This laptop is back from Acer repair service, diagnosis gpu dead, the entire mainboard needs to be replaced.
So now I realize I made a mistake, I went straight in that direction!
At first, it didn't power up, just some flashing of the battery LED.
Later, I realized that by removing the battery connector, it goes further, I got the current state ( video on Youtube).
If you still think this value of 0.11 can be considered normal,...

Proxy64 · 06-06-2025, 09:52 PM

Oh looking with the microscope the down side of the board I noticed something weird !...

Proxy64 · 06-06-2025, 06:31 PM

On the other side I found this:

MU5DC/CH7DC MAIN BOARD
REV: 2. 0
PCB MADE IN CHINA

But the PDF file I found here doesn't match, probably because mine is from 2017 (not from 2020)

Proxy64 · 06-06-2025, 06:25 PM

The other side

Proxy64 · 06-06-2025, 05:37 PM

Hi all from a retired electronician in Thailand....

Proxy64 · 06-05-2025, 11:29 PM

I remove these 4 coils...

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Trying to disconnect shorted GPU on my Acer Predator 17 G9-793-73A6 (N15P4)

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Looking for Acer Predator 17 G9-793 (N15P4) schematic