1D8V_S5 is 41ohms to GND, The two others are 500 and higher, and the two 1.05V rails are 1k and 13k.
Experience is just as valuable as textbook knowledge.
Shorted rail(s) aside, What do you think of the sleep signal problem I asked about in my first post? I would assume that the SOC is detecting a problem (perhaps with the I2C communication) and keeps the system in sleep, except that I do see some voltage on those lines at the right times which I think means they are trying to turn on but something is holding them low. However, the resistances are fairly high on those...
cappernicus
Member
"Lost and confused"
Last Activity: Today, 01:28 PM
Joined: 09-12-2024
Location: Mesa, AZ
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It is indeed, but why is that a strong indicator?
Not to be rude or doubt your experience, I just want to learn as much as I can from this.Leave a comment:
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Update: I'm pretty sure I found it, but I need confirmation.
I don't know why I associated the TVS with the SDA in my last edit; they aren't connected. Probably because I wrote it at 4:00AM... :/
I pulled the two parts in question, and tested both them and the board. As I suspected (after I got some sleep) they are perfectly fine. The shorted line on the dual FET (CPU_I2C_SDA_SML1) is only connected to 3 relevant things, the CPU and both burnside-bridge chips. The short on the TVS, however, disappeared completely when I pulled it off. The chip tests good, and the pad...Leave a comment:
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I thought so too, so when I discovered that I measured everything I could on that rail. I obviously couldn't measure the capacitors (unlikely), but every single resistor matched the datasheet and all the diodes and transistors tested good. That leaves the chips. The ones I can test via indirect means test ok, but I can't test most of them without removing stuff.
SCL measures 0.532V
SDA measures 0.478V
I tested all the TVS diodes, and for good measure I tested all the other diodes as well as the dual FET packages and I found two anomalies. One TVS line connected...Leave a comment:
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No takers? I've spent a couple weeks puzzling over this thing, tracing and measuring everything I could think of, but I just don't know much about computer architecture and signal sequencing.Leave a comment:
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Acer Spin 5 - Lenny_ICL (19771-1) -- Dead - PM_SLP_S3# held low
Laptop model: Sp513-54n-74V2
Testing power rails (separated by chip) reveals:
19V_DCBATOUT - (active)
5V_AUX_S5 - (active)
5V_S5 - (active)
3D3V_AUX_S5 - (active)
3D3V_S5 27Ω - (good) - enabled by [B]Nuvoton[/B] chip
1D8V_VCCIN_AUX - (good) - enabled by 1D8V_S5 PG signal -- (dependent on 3D3V_S5)
1D8V_S5 41Ω - (good) - enabled by 3D3V_S5 PG signal
1D05V_VNN_BYPASS - (good) - enabled by 1D8V_VCCIN_AUX... -
If anyone found this schematic/board file I need it as well.Leave a comment:
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I've just started using this, and noticed that net connections to parts on the reverse side always show up in a 180d rotated position. You can see this in the image I have attached, where the board has been flipped horizontally with the same part highlighted. In the top image the line going up to the top left of the board should in fact be going to just a few mm away from the highlighted chip. Is there any way this can be changed so that the net connections align in a "see-through" positioning? I find it extremely difficult to keep track of where everything is this way. Or is it just...Leave a comment:
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I stumbled upon this forum looking for a schematic for an Acer laptop that I accidentally bricked, and given all the things I look for online I'm really surprised I didn't know about it years ago. I'm more of a lurker though and have a strong reluctance for being social, so you won't see me post much.
I started soldering when I was 8, and built my first computer from random spare parts a friend gave me back in ~2000. Some people live by the saying, "Fix it up, wear it out, make it do or do without." For me its more like, "Fix it up, wear it out, fix it up again, until...Leave a comment:
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