Timp74
Senior Member
Last Activity: 05-07-2026, 03:38 PM
Joined: 04-13-2018
Location: Barcelona
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The second smaller IC is something like the SY21154, a step down regulator. It would be great if someone could tell me the values of R1 and R2 (circled) or what output voltage this should be giving. Seems to supply power to the WiFI option card via a dual load switch to the left of the first IC mentioned above....
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I think the first IC is BQRxxx, a Silergy SY21618 Single Inductor Synchronous Step Up/Down Regulator. Which doesn't seem to be available anywhere :/Leave a comment:
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Identify ICs on Huawei Mateview 28.2 4K monitor motherboard
Hi All, Could anyone help with identifiing the following 2 ICs? The first I think it's a bucks/boost converter with integrate mosfets. Marking in BORDEC(or BQRDEC) It's a modified QFN package. Not sure what the second is, marking ADEAJ 8 pin. Possibly logic gates of some sort...
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Turns out the fault was gunk formed under u7700 due to liquid damage/corrosion and working on the board. The audio IC was okay all along....Leave a comment:
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I tried reballing the the secure element, only to find that the schematic/boardview for the A2992 is quite different to the a3401 in this area. Looks like there was nothing wrong with the VDDA0_SE 1.8v rail. The fan spin problem persists...Leave a comment:
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Right, although the Secure Element appears to be working on closer inspection the VDDA0_SE 1.8v rail is shorted to ground. I suspect the chip itself is damaged. Can the Secure Element be replaced from a donor board? Seems like the kind of thing that would be paired with the SOC.
Still not sure if that's the cause of the fan spin though. I ran macmade's Sensors app to check the temperture and other readings against a similar macbook. Sensors shows different readings for TVA0, Ts0P, Ts1P and TCMb between the two macbooks, althougth what do these names mean... I don't know...Leave a comment:
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Although there is still the fans on full problem... All self diagnostic tests pass. I've tried the motherboard with a known working trackpad and still get the fan problem. I would be greatful for any suggestions on this one. Thanks.Leave a comment:
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To answer my own question. It looks like the Secure Element is working okay. It appears in "ioreg -l" output as the "stockholm-spmi" device. In the System Information App, Software/Extensions I can also see the AppleStockholmControl kext has loaded successfully.Leave a comment:
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Here are the schematic and boardview files for the 820-02918 (A2992 EMC 8407). It's very similar to the 820-03400 although the three DMIC level shifter ICs UR950/UR960/UR970, and the lid angle sensor level shifter IC U2230 have been moved from the middle of the board to near the Secure Element U5000.
​...Leave a comment:
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Macbook Pro 14 M4 a3401 820-03400 Secure Element Liquid Damage...
Hi All. I have an A3401 820-03400 motherboard with liquid damage to the area of the board that has the Secure Element, display current sensor and TPAD_CONN I2C and microphone DMIC level shifters. Everything works but the fans ramp up to full speed once MacOS is booted. I've checked the power and signals on all damaged IC, everything looks okay with the exception of the Secure Element which dosen't have 1.8v on any of the 4 VDD* caps(C5009/C5010/C5015/C5016). I can't find much information on the Secure Element, although ApplePay stores cards okay. Could the Secure Element be the cause of the...
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Huawei Matebook 14 AMD 2021 NB2686_MB_V3 Motherboard 3.3v converter chip indentification...
Could anyone identify this 3.3v DC-DC converter chip? Marking DCUCLK or DCUCLD. I think it maybe a Silergy part, but can't work out which one, so could be something else.
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Hi, did you make any progress on this? I'm looking at doing something similar to a Matebook 14 AMD 2020. There is no schematic availble, but I was thinking if I could find a schematic for a similaly speced laptop, that may give a clue to how the memory strap resistors are set up on AMD machines....Leave a comment:
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Just realised that the motherboard has a programable EC chip on it too.. That could also be the problem, so the EC image is also needed. It's an IT5571VG-128. There isn't much info available for it unfortunately.....Leave a comment:
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YUMYQ22225Y00371
Thanks....Leave a comment:
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Huawei Matebook 16 AMD R7 2021 CREM-WFD9
I have a Matebook 16 with a corrupt BIOS I think. Would be very grateful if someone could upload a working dump. I haven't been able to download an image from Huawai.
I include a copy of the BIOS dumped and verified with a CH341a 1.8v and flashrom The laptop won't POST. No logo. Keyboard lights up, CPU gets warm, fans spin, draws about 20w for 20 seconds then loops. Charging light starts flashing white rapidly towards the end of the loop. Caps and Fn keys lights are on. No display or backlight.... -
To answer my own questions... I finally had the time to look at this machine again now that the boardview is availble. Turns out the machine wasn't powering on because there was crap under the slave PMIC. Took me a while to work out. I noticed that the 1v8_s2 rail was beening pulled up to 2.1v by 3v8_aon, there was 300 ohms between the rails, it should be Kohms. I guess other rails were off too. Anyway I soaked the board in isoproponol for a few hours and ran a flux cleaner under the slave PMIC. The machine now boots and works fine. I don't see any reason the a missing backlight bucks/boost...Leave a comment:
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Re: iMac 27" 5K 2017 bios dump needed
Can I just flash this .bin and it will work, or do I need to clean the ME region or do anything else?Leave a comment:
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Re: MSI GE 66 Raider - MS-15411 EC ROM
Okay. So I removed the KB9028g chip and traced the pins. They are different to the pins given in the first post. Maybe a different version of the motherboard. The one I'm working on is version 001 I think. Part of the number is covered by the CPU support bracket so I can't see it clearly. Anyway, these are the absolute pin numbers for programming the KB9028g on this board:
KS03 - 37 - Connect to gound on MB, which also needs connecting to GND on the programmer.
KSI4 - 28 - CS
KSI5 - 27 - CLK
KSI6 - 26 - MOSI/DI...Leave a comment:
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Re: MSI GE 66 Raider - MS-15411 EC ROM
Just to add, the pinout for the KB9028g BGA chip is shown in the schematic for the Stream 14-z010nr which is on Badcaps......Leave a comment:
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Re: MSI GE 66 Raider - MS-15411 EC ROM
Where did you get the boardview from? I've never bought anything from the websites that sell these things. Do they actually work?...Leave a comment:
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