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jkucukov
Member
Last Activity: 02-27-2025, 12:05 AM
Joined: 02-05-2025
Location: Salt Lake City
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Here was my makeshift setup for the day
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I received Digikey delivery today on the two AON7528 mosfets, at 1st glance the new mosfets were larger than original, but they were still able to fit on the board. I got it soldered in with hot air station no problem, bit crooked.
Assembled the laptop and we have picture, that's crazy!
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Battery is charging, orange light is on and everything seems to work.
I'll take it apparat again and show my 1st mosfet install ever, not...Leave a comment:
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Looking through the datasheet I found a discrepancy on the 1st link with the AON7528 mosfet, the DFN size under the detail description shows as 3x3 while in the Datasheet pdf its shown as 3.3x3.3.
Strangely there seems to be two Datasheets in existence for the AON7528, both carry a version date of May 2012 Rev0. I attached the two I got, one from DigiKey and the other from Octopart. The Datasheet from the Octopart site seems to show the right 3x3 size.
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[ATTACH]n3572679[/ATTACH]Looking through the datasheet I found a discrepancy on...Leave a comment:
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Found a good one today, non Aliexpress brand.
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Thank you sir, the 1st link is the perfect fit. Didn't think I was getting 10 to make it worth while shipping. Now I need to find some applicable 0805 and 01005 capacitors to go along with the order. Typically are the beige and gray colored MLCC capacitors of a certain capacitance?
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The Alpha Omega aon3414 was based on a Panasonic mosfet, the mosfet I have is a5 p0903bea from Unikc. I tried searching for an equivalent p0903bea on Digikey with no luck.Leave a comment:
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This is the best I have on hand, some super wick and 3 solder wires:
The no name brand (blue cap RoHS tag): According to the MFG tag its 99.5% Sn and 0.1% Lead
Gray Craftsman Lead Free Rosin Core is Low Melting Aloy 96% Tin and 4% Silver
The roll of Maiyum Rosin Core solder is 63% Sn and 37% Lead
What would you recommend out of the 3 options I have?
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Shipping options from Amazon aren't the best:
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Ebay tends to have longer lead times as products are all exclusively from china.
You've mentioned Digikey in passing, any other trusted sites?Shipping...Leave a comment:
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With the 2nd mosfet removed, the values of the 1st mosfet (M3056M) from the front side of the MB are as follows:
Source <> drain = 5.88 Mega Ω
Source <> gate = 4.6 Mega Ω
Drain <> gate = 1.34 Mega Ω
Those values look great to me, what do you guys think?
Edit: measuring the removed mosfet shows same low resistance values...Leave a comment:
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Took literally 5 seconds to get the mosfet removed, my 1st time using the hot air rework station and it was most pleasant experience ever. 380C @ 60L/min with a dab of flux. Didn't have Kapton tape but had plenty of aluminum tape to dissipate heat. Worked like a charm!
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[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3571935}[/ATTACH]Took literally 5 seconds...Leave a comment:
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The machine I have has airflow settings in Liters / minute it goes up to 120 L/m. What would be corresponding airflow for that temp range?...Leave a comment:
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Lol, may as well be, it came from Ontario CA
What temp and air settings to get the mosfet off without causing damage to the traces, the videos make it look so easy....Leave a comment:
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Hot Air Station is in!
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Yes, thank you. I have placed the hot air station from Amazon, will have it delivered by Wednesday. Once I receive the station I will get the mosfet removed and take photos, I have a hunch that there is the metal underside on the drain side. The Turkey site is just what had the explanation of the top side characters, once I knew A5 was the product by Unikc there were many options state side. But I wont make any hasty decisions just yet, I'll present the findings once that mosfet comes off....Leave a comment:
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Here is the data sheet of the A5 P0903BEA from Unikc...
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it seems the Mosfet is by Unikc, I found it on this Turkish site saying that A5 is the product while the 3 letters after are indicative of product date: [url]https://www.atombilgisayar.com/a5-p0903bea-nchannel-enhancement-mode-mosfet-en.html?srsltid=AfmBOoqBtOyuOlVjXmwqoYOyUrTtCgv5wFd5sf7LoHSVbQTPva5ELj4T[/url]https://it seems the Mosfet is by Un...yUrTtCgv5wFd5sLeave a comment:
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Here is the picture of the front of the Board, 1st mosfet (M3056M 841 46E) with:
Source <> drain = the resistance climbs in megaohms range
source <> gate = [B]35.7 Ω[/B]
Drain <> gate = the resistance climbs in megaohms range
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Here is the image from the back side of the bard with as you said the bad mosfet (A5 VNA 8V0303):
Source <> drain = 88.3 Ω
source <> gate = [B]35.7...Leave a comment:
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I need to buy a hot air station. Right not the main power rail has a high Mega ohms range with the bad Mosfet. The bad mosfet reads A5 VNA 8V0303, looking for it on google doesn't produce the exact match, is there a compatibility site I can be using to find an equivalent? Where would be the best place to find these replacement mosfets?...Leave a comment:
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I confused drain and source sides of the mosfet sides last night, the way I'm taking measurements is red lead is on the source and black lead is on the drain (Source <> drain)
Here are the updated mosfet values:
1st mosfet, front side of MB
Source <> drain = the resistance climbs in megaohms range
source <> gate = [B]35.7 Ω[/B]
Drain <> gate = the resistance climbs in megaohms range
2nd mosfet, back side of MB
Source <> drain = 88.3 Ω
source <> gate = [B]35.7 Ω[/B]
Drain...Leave a comment:
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Resistance values from Power Mosfets:
1st mosfet, front side of MB
Source <> drain = the resistance climbs in megaohms range
source <> gate = the resistance climbs in megaohms range
Drain <> gate = 35.7 Ω
2nd mosfet, back side of MB
Source <> drain = 84.8 Ω
source <> gate = 120.4 Ω
Drain <> gate = 35.1 ΩLeave a comment:
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