Hi [USER="149220"]mcplslg123[/USER], thank you for your input.
I'm affraid you might be right. I've checked the resistance to the GND from PRB46 and it shows 0.1Ω (on both sides).
So probably MOSFETs got destroyed by a short caused by something else, just as you suspected.
Any noob-friendly step-by-step guide on how to try to find the shorting element?mcplslg123
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Actually, I found a store (TME.eu) that has AON7380 in a very good price. They also have AON7318. Which one would you recommend?
I see that PQB11 is EMP21N03HC, which I was about to replace with MDU1511. That store doesn't sell MDU. Any replacement from AON? For example they have:
- AON6512
- AON6560
- AON6500
I only checked 115A and higher, because the datasheet I found for EMP21N03HC says that its drain current is 100A, but I'm not sure if that's true. They also sells lower currents from AON.Leave a comment:
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AON7380 did the trick - it is not sold by the store I'm about to order MDU1511 from, but I can order it for a little price from a different seller.
So, to sum up, I will order:
- AON7380 for PQB12
- MDU1511 for PQB11
I will do it now, when it arrives I will attempt a repair, hopefully the PC will boot. I will update the thread for sure. Thanks!Leave a comment:
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I probably have some other options, but honestly I'm lost as how to look for these
I'm using AI for finding replacements, then I looked through the store where I'm about to order MDU1511. I probably ask for too much, but would you be able to take a look at this store offer to check if there is anything suitable?
[url]https://mikrusy[/url][dot]pl/szukaj.html/szukaj=chip
For some reason they name all the mosfets CHIP, which also doesn't make it easier to look for these.
I will try to look for replacement by myself as well. If I find something, I will post...Leave a comment:
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Yes, it is definitely smaller and it is PQB12. I have just removed it. It seems to have 3x3mm in size.Leave a comment:
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Thank you, so I need to order a replacement for it. Will SIS412DN be a good replacement for B09N03?Leave a comment:
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Also, the power adapter doesn't short now, with the MOSFET removed....Leave a comment:
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The measurements of the second MOSFET in resistance mode:
1. Red probe on source, black probe on drain: 64.8Ω
2. Black probe on source, red probe on drain: 106.4kΩ
3. Red probe on gate, black probe on source: OL
4. Black probe on gate, red probe on source: 53.2kΩ
5. Red probe on gate, black probe on drain: OL
6. Black probe on gate, red probe on drain: 105.2kΩ
I think that this one looks good and we're close to saying for 100% percent that the PQB11 is the culprit, aren't we?Leave a comment:
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The measurements of removed MOSFET in resistance mode:
1. Red probe on source, black probe on drain: 0.1Ω
2. Black probe on source, red probe on drain: 0.1Ω
3. Red probe on gate, black probe on source: 1.00kΩ
4. Black probe on gate, red probe on source: 1.10kΩ
5. Red probe on gate, black probe on drain: 1.00kΩ
6. Black probe on gate, red probe on drain: 1.10kΩLeave a comment:
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Thanks, I managed to put it in place.
Is it a good idea to plug in my DC adapter with MOSFET removed just to check if it still shorts? Of course I won't be powering on the machine, anyway the motherboard is completely out of notebook's body now.Leave a comment:
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I mean this one, maybe I have a different schematics file?
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3629152}[/ATTACH]
It is really tiny, but I haven't lost it, so I will just try to put in in place.
I will come back with measurements shortly.I mean this one, maybe I have a different schematics file?
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3629152}[/ATTACH]
It is really tiny, but...Leave a comment:
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Thanks, will do it shortly. For now I managed to desolder it (that damn GND pad added me some gray hairs) and it still shorts and there is no short on pads on motherboard, so I believe it really was faulty.
Unfortunately I accidentaly desoldered the PRB47 and I need to put it back in place. Can you please tell me if it's polarised and has to be put in the correct way or it doesn't matter?
Sorry for asking noob questions, but I'm not even really sure what is this. For now I believe that this is a resistor and I can put it back in place any direction.Leave a comment:
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About that second MOSFET (B09N03) - I measured it once again (on the board) and it shows following values in diode test mode:
1. Red probe on source, black probe on drain: 0.516V
2. Black probe on source, red probe on drain: 1.402V
3. Red probe on gate, black probe on source: 0.611V
4. Black probe on gate, red probe on source: 0.487V
5. Red probe on gate, black probe on drain: 0.928V
6. Black probe on gate, red probe on drain: 1.388V
Does the above mean that this second MOSFET is defective as well? Or might it mean that something else...Leave a comment:
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Unfortunately I live in a small town, but I can order MDU1511 online for a good price. AI says it is 100% compatible, but I'd like to confirm with experts before ordering.Leave a comment:
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Thank you, I will do it today evening or tomorrow. The mosfet to the left of the faulty one (the left side on my picture) is good - it doesn't short.
As for donor board, I only have old Clevo P670HS-G somewhere in the basement. Not sure if I can find something matching there, so I was thinking about ordering MOSFET. If you have any recommendations on what should I order, I'd be very grateful for these....Leave a comment:
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I've been googling and reading about it and I think that the PQB11 MOSFET might be dead.
I measured it in diode test mode and I get the following results:
1. Red probe on source, black probe on drain: 0.000V
2. Black probe on source, red probe on drain: 0.000V
3. Red probe on gate, black probe on source: 0.621V
4. Black probe on gate, red probe on source: 0.494V
5. Red probe on gate, black probe on drain: 0.620V
6. Black probe on gate, red probe on drain: 0.492V
I'm attaching a photo with source, drain and gate marked according to my...Leave a comment:
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Thank you for responding so fast!
So, I've put my multimeter in 20k Ohms mode and it showed following values - please see the image with arrows attached:
1. Black probe on GND, red on arrows:
- green arrows: 9.50
- red arrow: 0.00
2. Red probe on GND, black on arrows:
- green arrows: 17.92
- red arrow: 0.00
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3628008}[/ATTACH] Thank you for responding so fast!
So, I've put my multimeter in 20k...Leave a comment:
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Acer Nitro 5 AN517-52-56A5 - won't charge, shorts the AC adapter
Hello,
I have a problem with Acer Nitro 5 AN517-52-56A5 (motherboard: GH51M LA-K862P Rev: 1A). I was playing TLoU2, which is a rather demanding game, for a few hours, unless the notebook turned off (my guess is that the battery drained to 0%). Now, when I connect the AC adapter, the LEDs are not coming on and the laptop doesn't charge.
It also shorts the AC adapter - I've checked two of them from different manufacturers. Though the AC adapter gives 19,5V as expected, the voltage drops to 0V when I connect it and disconnect from laptop - it comes back to 19,5V when I reset...
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