Hello, sorry for the delay. My wife and I had an accident on a motorcycle.. seems like it's been a lot of rainy days for me lately.
It tests .482V at CF413
The (seemingly) equivalent CF513 tested .51V...
Daniel M
Member
Last Activity: 06-24-2024, 10:04 AM
Joined: 05-27-2024
Location: San Jose
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Thanks!
All the resistors tested fine, until suddenly nothing was coming up out of pin 6. I think I may have obstructed or slightly damaged the contact with my probe.. see picture.
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[B]RF295[/B]: 15
RF299: 15
RF290: 15
RF294: 100
[B]PP3V3_UPC0_LDO...Leave a comment:
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Hi Mon, sorry for my ignorance, but I got a bit lost. I tried to follow the path from SPI UPC01 CLK and it seems to go between UF260 and JF202. On the schematic I looked at for the CD3217, it lists SPI four times, but if I cross reference the pins, they are ground pins on board view.
So needless to say I got lost here.. never seen schematics so complex before (only ever really worked on power supplies and audio amplifiers). Any guidance would be greatly appreciated
[ATTACH=JSON]{"data-align":"none","data-size":"full","titl...Leave a comment:
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SPI_UPC01_MOSI: 0.01 V
SPI_UPC01_MISO: 3.2V
SPI_UPC01_CLK: 0.01 or 0 V
This looks wrong, what could be happening here?...Leave a comment:
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Both [B]USBC0_3V3LDO_EN [/B]& [B]USBC1_3V3LDO_EN[/B] test OL / Open to groundBoth [B]USBC0_3V3LDO_EN [/B]& [B]USBC1_3V3LDO_EN[/B] test OL / Open to groundBoth [B]USBC0_3V3LDO_EN [/B]& [B]USBC1_3V3LDO_EN[/B] test OL / Open to groundBoth [B]USBC0_3V3LDO_EN [/B]& [B]USBC1_3V3LDO_EN[/B] test OL / Open to groundBoth [B]USBC0_3V3LDO_EN [/B]& [B]USBC1_3V3LDO_EN[/B] test OL / Open to ground...Leave a comment:
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PP1V5_UPC0_LDO_CORE - both 1.58V (didn't need to switch the connector)
[B]PP1V8_S2[/B] - 1.8V (tested at several places)
[B]USBC0_3V3LDO_EN[/B] - 0V at TGB19
[B]USBC1_3V3LDO_EN[/B] - 0V at TGC66
I need to try those measurements again - maybe I should test at a different place? This is an interesting find!PP1V5_UPC0_LDO_CORE - both 1.58V (didn't need to switch the connector)
[B]PP1V8_S2[/B] - 1.8V (tested at several places)
[B]USBC0_3V3LDO_EN[/B] - 0V at TGB19
[B]USBC1_3V3LDO_EN[/B] - 0V at TGC66
I need to try those...Leave a comment:
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One port does the cycle I described, and the other port does .2A then turns off, and repeats. This port is like a faster cycle.
I don't think the laptop will power on with just the charger since it is not pulling 19.5V, but currently I have the board taken out so I can't check
I flipped the connector over and tried again, both ports are behaving the same regardless of the orientation of the plug...Leave a comment:
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BTW I should note - the power draw on the board is fluctuating.
On USBC: 5V first @ 0.2A, then it drops to 0.03A then my ammeter resets and the cycle repeats.Leave a comment:
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Thanks! Okay - dumb question, how to I reach the pin of L77D0?
I flipped the board over and tested C77D8, C77D7, C77D5 and all tested 1.225V...Leave a comment:
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Pin 2: 0.48 V
Pin 3: 0.46 V...Leave a comment:
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Hello, thank you greatly for your response.
Yes, the computer works on battery, and the battery shows to be in Good health. I checked before disassembling and the cycle count was around 320. When connected, simply nothing happens.. it doesn't say "Battery Is Not Charging" - nothing.
I didn't mention this: the one major change that happened is that I was going to sell it, so I did a factory reset. After resetting, I never charged it.. I just tested the system itself under battery and everything was fine. I didn't attempt to charge it because I didn't think anything...Leave a comment:
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MacBook Pro M1 A2338 256/16 820-2020 Turns On but No Charge, stuck 5V
Hello all,
I bought this MacBook brand new at launch. I have taken care of it since new and it suddenly failed on me recently.. it began to refuse to charge.
I first checked all the basic things before opening it, to no avail.
I have now opened it and taken the logic board out. I did a visual inspection and found no visible liquid damage or corrosion, or exploded caps, burnt components, etc. Cleaned the usb c connectors.
Here are my measurements thus far:
PBBUS_AON: 12V
PP5V_S2: 5.3V
PP3v8_AON:... -
Hello everyone, I'm Daniel from Costa Rica.
I've always loved tinkering, and have some fundamentals training in electronics, but am by no means a qualified tech. Learning what I can to fix my own devices. I appreciate all the knowledge being shared here.Leave a comment:
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