It is possible to program a BGA EC standalone but the only one I know of currently is the SVOD4 with the debug PCB and BGA socket adaptor. This is 140 euro from their store, on top of the SVOD itself.
Only one I really trust on Aliexpress these days is SUHMS
reformatt
Badcaps Legend
Last Activity: Today, 04:58 AM
Joined: 02-17-2020
Location: Noosaville
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LA-N631P schematic and boardview request
This is from a 2024 Acer Aspire 15 N23C3. Unit has liquid damage but CPU seems to have survived. Can't find anything on this board, but have noted the following until a schematic becomes available.
PUA01 RT6543AGQW (ML=) [I]PCH +1V[/I]
PUZ101 RT3624BE [I]CPU Vcore[/I]
PU301 RT6338BGQUF (RW=) [I]+3.3V[/I]
PU501 RT6310CGQUF (S2=) +5.1V
PUM1 TPS51488 [I]RAM +1.2V[/I]
PUB1 Intersil 9238 B+
UVH2 EM5109-A [I]+3V LDO[/I]
UK1 KB9542QG EC
Main issues for this board are a hole in the PCH power IC... -
Good point. Some trackpad cables (like the one on the old A1534) were asymmetric, and had broad copper connections for the main power rail and ground. I once had a similar thing on that model because customer had torn the cable, ordered another but had put the cable in upside down, shorting all the data lines etc together on the other side!
On this one, you have 5 pins on one side for PPBUS_AON so that's the only thing that makes sense to me.Leave a comment:
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Are you getting 20V negotiated on USB-C and what is the current flow? Check battery flex cable for corrosion etc, SMBUS lines to battery etc. Go to System Report/Power, is battery data reported? Service Recommended etc?
MAC OS doesn't report charging till about 1 minute after being plugged in, even though battery is charging.Leave a comment:
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Being an A1990 it has CPU and GPU graphics and sounds like one isn't working properly when it's flipping from one to the other or or when the kext is loaded. The MUX chip comes to mind (U9850) as that's commonly damaged when you have liquid damage in the LCD connector. Might be a bad GPU.Leave a comment:
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Don't have the schematic as it's behind a paywall. Did see a block diagram though, looks like this chip isn't programmable and gets it's code from a 256MB SPI flash chip.
...Leave a comment:
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R5263 is also back to front on pinoutLeave a comment:
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Just discovered this today. Working on a liquid damaged board, and cleaning up corrosion around UC300. The pin numbering is back to front in the schematic in the schematic for RC321, hence why its wrong on the boardview. I will refer to the pins as they currently are on the boardview.
CC328 pin 1 connects on the board to RC321 pin 1 not pin 2 (the bottom of the resistor, not the top). RC321 pin 2 connects to UC300/22 and CC329 pin 1.
CC332 also back to front on the pinout too...Last edited by reformatt; 03-27-2025, 10:24 PM.Leave a comment:
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If you feel T2/BridgeOS are fine, then you would check all your voltages up to CPU Vcore are present during the Intel power sequence. Presence of Vcore indicates the preceding ones are present and that your PCH is likely ok. The EFI BIOS is part of the DFU restore and located on the NAND's so you can rule that out.
If the CPU is attempting to boot, you should see that in your USB-C current consumption (without battery of course). Would expect over 1 amp for this board on the bench when plugged in.Leave a comment:
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Forgot about this thread. Are you still working on it? Do you get VSYS15 at all or is the main power rail dead? Have you checked it isn't shorted?...Leave a comment:
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This model (and the A1990) often have corrosion on each wing on the board where the fan intakes are. I would inspect these areas closely for corrosion. Note DFU should be a last resort, not the first one. If you have an existing hardware issue, this makes troubleshooting so much harder as the DFU restore fails and you have incomplete or missing BridgeOS. So two faults and it makes it a lot harder. This used to be in the old RepairWiki notes, not sure about the new one.
Refer to the wiki for DFU errors:
[url]https://logi.wiki/index.php/DFU_Mode_Restore_(Macs)#DFU_error_codes_and_troubleshooting[/url]...Leave a comment:
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Check SSD power rails for shorts. Common on this model. You might be in luck for it to be a shorted cap on the ssd power rails, as PPBUS_G3H isn't shorted as well.Leave a comment:
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Keyboard does not work on these models without trackpad connected. There is a sensor on the trackpad, so CPU is throttled/fan speed max in it's abscence. Connect another trackpad and cable first to confirm, as from memory you need to remove the battery to gain access to it for replacement. No point doing that to find out it's not the trackpad after all....Leave a comment:
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My inclination is to re-examine the EC, as it does communicate with the BQ chip via SMBUS. Quick look on Alixpress, there are two variations of the IT8227E with 192kb firmware, BXA and CXA. Confirm you have the right one and go over each pins soldering with a fine tooth comb. Check your SMBUS lines as well.Leave a comment:
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Main power rail shorts often kill one of the input MOSFET's. If either are shorted, the BQ IC will disable charging. Pretty sure this info is in one of Piernov's sticky's at the top of the sub. This circuit uses a BQ24781, but you can use the BQ24780S datasheet to get an understanding of the function of ACFET/RBFET.
This is a beefy design so has dual MOSFET's for ACFET/RBFET. Lower wattage designs in regular lappies would shut down the power adaptor in the event of this kind of short on the main power rail, but these gaming systems keep pumping in the power hence why the cap was...Leave a comment:
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Have you checked your ADAPTER_ID logic line? I'm assuming the DC jack collapsed, shorting 19V into the ADAPTER_ID line, killing the EC in the process. There is a TVS diode PD102 that should have protected it, perhaps this is shorted and your adaptor ID isn't being recognised? This would be my line of thought. Pretty beefy charger for this model at 240W.Leave a comment:
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No. After replacement, the +5V rail would sometimes come up, or not at all. This was a job where the customer attempted to replace the battery themselves, and ripped the connector off the battery itself if I recall.
It was becoming a rabbit hole, so batted it back and told him to go back to Dell.Leave a comment:
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Haven't used the Vertyanov so not familiar with it's breakout board. You don't need the connector if you solder wires directly from the breakout to the corresponding pads on the board (either the JDBG1 pins or the test pads on the flip side of the board). You just need to buzz them out with a meter for KSI4~KSI7 and KSO3 to the EC to identify each one. It will be similar to the LA-161P board I would think.
BTW, it won't work if you connect directly to JDBG1 as R9743 is not stuffed for the KSO3 data line....Leave a comment:
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You have to weigh up the cost vs the time you can waste on a fault like this. Like when I first bought a thermal camera. Was a $700 outlay but since then it has paid for itself many times over for the time it has saved me. EC programmer is the same.
SVOD4 is 256 euro directly from their store and it comes with the breakout extension board and ribbon cables for most keyboard connectors. It also has the ability to do regular SPI25 programming, along with MEC, Nuvoton, ITE and a bunch of other things I haven't played with. I think it's worth the investment. They do have adaptors you...Leave a comment:
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