Re: ACLU2 (G50-70) Motherboard Not Powering On
sorry guys for no updates, I haven't had any free time this past week to get to work on the motherboard..
orestes_
Member
Last Activity: 11-21-2021, 05:46 AM
Joined: 06-23-2021
Location: Athens
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Re: ACLU2 (G50-70) Motherboard Not Powering On
i shall give it a try in the weekend then. I will keep you posted....Leave a comment:
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Re: ACLU2 (G50-70) Motherboard Not Powering On
are you suggesting removing these because they are possibly what's wrong with the motherboard or to further investigate what could be wrong with it?...Leave a comment:
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Re: ACLU2 (G50-70) Motherboard Not Powering On
Hello,
Thank you for your reply.
1)
1. No voltage
2)
1. No voltage
As for the other two points (for the 3V and 5V), I am not sure where exactly I should be probing for voltage? I tried probing both sides of all nearby passive components but I did not detect any voltage on all of them.
I am not sure I will be able to desolder them safely/resolder them back on the board if needed? I only have a T12 chinese soldering...Leave a comment:
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Re: ACLU2 (G50-70) Motherboard Not Powering On
indeed, I am stupid.
however, there is no voltage present on both of them even when with reference to ground....Leave a comment:
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Re: ACLU2 (G50-70) Motherboard Not Powering On
Took me a while to find them 😅.
You can see in the pictures the said area of the PCB and how I probed them.
It reads 0V on both of them....Leave a comment:
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Re: ACLU2 (G50-70) Motherboard Not Powering On
Thank you for the detailed instructions, here you go:
Fuse is OK (20V in and 20V out).
With reference to Gnd:
Mosfet #1 (4488A):
Pin 1: 19.91 V
Pin 2: 19.91 V
Pin 3: 19.91 V
Pin 4: 19.91 V
Pin 5: 0V
Pin 6: 0V
Pin 7: 0V
Pin 8: 0V
Mosfet #2 (4407A)
Pin 1: 19.91 V
Pin 2: 19.91 V
Pin 3: 19.91 V
Pin 4: 19.91 V
Pin 5: 20.44V
Pin 6: 20.44V...Leave a comment:
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Re: ACLU2 (G50-70) Motherboard Not Powering On
I think you misunderstood, this is in fact a Lenovo laptop. It is the G50-70 with a 4th gen i3 and an basic AMD discrete GPU. The ACLU2 is, I think, the codename for this motherboard. There is also a thread on this forum, I think there are all the schematics needed there:
[url]https://www.badcaps.net/forum/showthread.php?t=72373[/url]
1. pic attached
2. 20V in, as the adapter states on the sticker. it is the original Lenovo one.
3/4. there are 2 mosfets near...Leave a comment:
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ACLU2 (G50-70) Motherboard Not Powering On
Hello,
As the tittle suggests, the laptop does not want to power on. It is completely dead (no LEDs or the CPU/GPU fan spinning).
Motherboard does received power, connector and the connector cable do work.
I can hear a clicking sound coming from the motherboard every ~1.5s, I assume there is a open circuit somewhere that is causing all this trouble. I cannot pinpoint the location of the fault by ear, it sounds the same no matter where I place my ear.
Nothing is hot or even warm to the touch. Super I/O chip does not appear to be damaged,... -
Re: Dell Inspiron 15 33308 Fried M/B
Yeah I thought so as well. Guess it will have to wait for now
...
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Re: Dell Inspiron 15 33308 Fried M/B
Looks something like this and it has 2 settings for low airflow/heat and high airflow/heat.
I know that a hot air station would be ideal, but this is one of the very few times I had to work on SMD components, usually my T12 soldering station suffices for most of the repair work I need to do....Leave a comment:
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Re: Dell Inspiron 15 33308 Fried M/B
Hello, thank you for your replies.
I have two questions I was hoping you could help me with, I hope they aren't too oblivious.
1. Is it possible to desolder the IC with a rather large heat gun? (I do not own a hot air station unfortunately).
2. How can I tell which pin is which underneath this chip?...Leave a comment:
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Dell Inspiron 15 33308 Fried M/B
Hello,
I have the motherboard of a dead Inspiron 15. I (think) I have narrowed it down to the root cause of the problem: there is a fried buck converter on the M/B (51225 by TI). I found this specific IC gets very very hot when plugged in.
Will replacing this IC solve the problem or is there something else causing it to overheat and possibly damage it as well? Can you help me point me to towards the right direction here?
Motherboard schematic can be found here:
[url]https://w************************3mc.html[/url]
Additional images:...Last edited by SMDFlea; 07-28-2023, 02:49 PM. -
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