nelusab
Member
Last Activity: 12-15-2024, 06:12 AM
Joined: 08-29-2022
Location: Tg Mures
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Solved! It was the display flex cable. The 5V CAM line was damaged.... -
No, harware not detected, I also checked the harware with Apple Diagnostc tool and no issues where listed. I'm asking myself if something happened with ROM SPI during the first upgrade from Catalina to Sonoma. The upgrading process includes an iBoot version upgrade, and perhaps some changes in the U4770 ROM bin file....Leave a comment:
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I've allready booted from Catalina. Catalina was the first OS i've cloned, then i.ve tried an upgrade with the results I've reported, and after that I've cloned SONOMA on internal SSD. So yes I can boot on Catalina from an external SSD, having both SONOMA and CATALINA on external SSD. As I said the behaviour is the same on both OSLeave a comment:
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The touch bar fuction works ok, I couldn' check it until installing the OS, but now works ok. Also the screen backlight is working, the system boots prety well.Leave a comment:
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The scrren works well, without any lines or glitches. I've dissasembled from the topcase and checked the flex cables on microscope. No noticeable damage, and as I said works well, I mean the graphic function.
The laptop had macos Catalina installed on it and all functions, including ALS cam, FT cam, KB backlight, where working. During an system upgrade something happened resulting in a kernel panic, so the upgrade process couldn't be finished, the laptop entered in a loop booting mode, the progrss bar riching half on its way and restarting.
So I performed a DFU revival, followed by...Leave a comment:
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In a privious post is mentioned
SEP_CAM_DISABLE_DFF_L - 1,816 VLeave a comment:
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What does mean DFF from SEP_CAM_DISABLE_[COLOR=#e74c3c]DFF[/COLOR]_L ?
If it means DEFAULT it sould be in Low state?What does mean DFF from SEP_CAM_DISABLE_[COLOR=#e74c3c]DFF[/COLOR]_L ?
If it means DEFAULT it sould be in Low state?What does mean DFF from SEP_CAM_DISABLE_[COLOR=#e74c3c]DFF[/COLOR]_L ?
If it means DEFAULT it sould be in Low state?Leave a comment:
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The board has only the left LID sensor, so the value for the right side is normalLeave a comment:
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Hi mon2, I'm back with the measurements you requested
FT CAMERA
I2C_FTCAM_DSBL_SCL 0,591 - 1,800 V
I2C_FTCAM_DSBL_SDA 0,583 - 1,800 V
I2C_FTCAM_ISOL_SCL 0,550 - 1,816 V
I2C_FTCAM_ISOL_SDA. 0,557 - 1,816 V
I2C_FTCAM_SCL_R 0,439 - 1,816 V
I2C_FTCAM_SDA_R. 0,440 - 1,816 V
I2C_FTCAM_SCL 0,438. - 1,816 V
I2C_FTCAM_SDA. 0,439. - 1,816 V
ALS CAM
I2C_ALS_SCL_R 0,439. - 1,816 V
I2C_ALS_SDA_R. 0,439. - 1,816 V
Also measured :
PP3V3_G3S. - 3,33 V
SEP_CAM_DISABLE_DFF_L...Leave a comment:
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Also measured I2C_ALS_SCL. 0,439
I2C_ALS_SDA. 0,439Leave a comment:
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I've checked again, the results measured on LVDS connector are not accurate , actualy they are the same with the results measured on board, for ALS CAM.Leave a comment:
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Forgive me for delay, it was my daughter's birth day.
Now the measurment results:
FT CAMERA
I2C_FTCAM_DSBL_SCL 0,591
I2C_FTCAM_DSBL_SDA 0,583
I2C_FTCAM_ISOL_SCL 0,550
I2C_FTCAM_ISOL_SDA. 0,557
I2C_FTCAM_SCL_R 0,439
I2C_FTCAM_SDA_R. 0,440
I2C_FTCAM_SCL 0,438
I2C_FTCAM_SDA. 0,439
ALS CAM
I2C_ALS_SCL_R 0,243 / MEASURED ON LVDS CONNECTOR
I2C_ALS_SDA_R. 0,242 / MEASURED ON LVDS CONNECTOR
I2C_ALS_SCL_R 0,440. / MEASURED ON R5315 / Flex cable LVDS...Leave a comment:
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Hi, would you be so kind and share with us how you solved the problem?
I have the same issue with an A2289, facetime camera, ALS sensor and keyboard backlight doesn't work
Thanks!...Leave a comment:
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Ohh yeah, it helped me very much!
Thanks, anyway! -
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Hi Stephen,
I already tried with 2 other batteries. this one has 168 cycles. I... -
When I read the KP message - about a namespace error, I thought there's something about ACPI namespace and the ACPI tables are part of T2 ROM bin file. That's why I've asked you to help me with a clean T2ROM bin file.
The old battery had over 750 cycles, and I experienced something with an A1989 model, wich was working normal until the battery percentage was drawing down to 60% - 70%, when suddenly the system was crashing, rebooting by itself with KP message. So my explanation is that could be the same with this A1990, perhaps it was performed a major update, without the addapter pluged...Leave a comment:
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I forgot to mention the fan where running fast but nothing was heating on the board, I've checked the CPU, GPU, Nands, memory, T2 chip, they where at max 40 degrees(Celsius)Leave a comment:
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Hi Stephen,
I already tried with 2 other batteries. this one has 168 cycles. I could boot with the battery pluged in but with trackpad cable disconected. It booted slow, and the fans where running noisy, and that's how I found information about the battery.
I've performed a new DFU Restore, this time with last version of macos Sonoma on both macs, and with the last iBridge. The same result. Please tell me this, DFU Restore operation is reflashing the entire T2 ROM file?
I have some KP messages looking like this...Last edited by nelusab; 12-19-2023, 01:04 PM.Leave a comment:
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Hi Stephen!
I have an issue with an MBP 15' - A1990, it boots when battery flex cable is unpluged but when I plug in the cable it runs in kernel panic, the fans are running at max for a second and the machine reboots over and over again, in loop, until I disconect the flex cable.
First I thought is something about current sensing, and I replaced the current sense rezistor, after that the ISL chip (U7000). Result - same behavior. I've dumped the ACPI tables and I found that one of them SSDT SmcDppt.aml is empty, has nothing written on him. If this table is responsible of SMC behavior,...Leave a comment:
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Re: A2251 820-01949 No Power
I have the same problem and a tehnician told me that is about a corrupt bios.Leave a comment:
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