Hi all,
what´s the purpose of U0500 ROM located next to the M1 SOC? It seems to be somehow bound to the SN of the board. If I replace it with same IC from other a2338, it´s starting up in recovery mode and DFU fails (Error 9 most of the time, tried many times). If I put on the original U0500 I´m still in recovery, but can perform DFU and everything works fine again.
Is there a way to replace this IC without having the original one available? Unfortunately I cannot find any information about this ROM and it´s function..
Thanks
Opunktvoll
Member
Last Activity: 03-13-2025, 03:24 AM
Joined: 09-09-2022
Location: Euerbach
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a2251 820-01949 - reboot issues
Hi,
acc. to owner the macbook suddenly died for no reason. 20V but no s5 state.
Board looks clean, no damage at all. Thermal cam shows hot T2 and PMIC.
After DFU restore it was working again, but I´m not able to install MacOS because it always reboots (most of the time it shuts off during recovery mode loading screen, sometimes I can get into recovery and even format SSD, but latest after trying to install MacOS it shuts off again). --> Screen turns black, fan blow at full speed for one second --> macbook reboots
Any Ideas? -
Re: 820-02098 - a2442 - power cycling
After some more testing:
[B]PP5V_S2SW_USBC01[/B] and [B]PP5V_S2SW_USB23[/B] are both 0V because enable is missing ([B]P5VUSBC01_EN[/B] and [B]P5VUSBC23_EN[/B], both coming from the CD3217.. ). Acc. To schematic this is critical.
No matter if powered up via magsafe or each USB port, it's always missing. Could this be the reason maybe? Unfortunately I don't have a working board to compare.
Maybe this also explains the power cycling of the USB-C meter.. I once read this is always related to an issue with the... -
Re: 820-02098 - a2442 - power cycling
Sorry, my mistake.
I can confirm both [B]SMBUS_BATT_SCL[/B] and [B]SMBUS_BATT_SDA[/B] are at 1v8.Re: 820-02098 - a2442 - power cycling
Sorry, my mistake.
I can confirm both [B]SMBUS_BATT_SCL[/B] and [B]SMBUS_BATT_SDA[/B] are at 1v8.Re: 820-02098 - a2442 - power cycling
Sorry, my mistake.
I can confirm both [B]SMBUS_BATT_SCL[/B] and [B]SMBUS_BATT_SDA[/B] are at 1v8.Re: 820-02098 - a2442 - power cycling
Sorry, my mistake.
I can confirmLeave a comment:
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Re: 820-02098 - a2442 - power cycling
[B]SYS_DETECT_L[/B]: 0.45V
[B]SMBUS_BATT_SCL[/B]: 0.5V
[B]SMBUS_BATT_SDA[/B]: 0.5V
[B]TP_BMON_IOUT[/B]: OL
Measured with red probe on ground.Re: 820-02098 - a2442 - power cycling
[B]SYS_DETECT_L[/B]: 0.45V
[B]SMBUS_BATT_SCL[/B]: 0.5V
[B]SMBUS_BATT_SDA[/B]: 0.5V
[B]TP_BMON_IOUT[/B]: OL
Measured with red probe on ground.Re: 820-02098 - a2442 - power cycling
[B]SYS_DETECT_L[/B]: 0.45V
[B]SMBUS_BATT_SCL[/B]: 0.5V
[B]SMBUS_BATT_SDA[/B]:Leave a comment:
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Re: 820-02098 - a2442 - power cycling
Doesn´t make any difference with battery installed. Still cycling every 10s and still showing battery warning sign.
Battery is fully funktional and also charging when connected.Leave a comment:
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820-02098 - a2442 - power cycling
Hi all,
I have a a2442 with liquid damage mainly at Q5800 and UF800 area. But nothing serious. Also corrosion and burn marks at both USB-C ports (the ones below the magsafe connector). I cleaned all up and replaced the bad USB-C ports.
Ampmeter shows 20V and 0,13A for around 10 seconds and then the Ampmeter reboots. Same behavior on every port.
When reassembled in housing the display lights up and shows battery warning sign, so at least it´s doing something. But only for 10 seconds..
Any idea where to look at? First suspect was... -
Re: a1932 820-01521 - SSD issues
Board looks like new, just like the whole Macbook. So no liquid or drop damage. Any way to measure/confirm a CPU/PCH related issue?...Leave a comment:
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Re: a1932 820-01521 - SSD issues
Boot from USB is blocked by security settings and I´m not able to change it in recovery mode (no admin account found, which is necessary. And not able to install new account because of reboot issue..). So I guess this is no option here...Leave a comment:
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a1932 820-01521 - SSD issues
Hi all,
I got an a1932 13" Air with SSD issues.
It was booting to logon screen without issues but reboots after some seconds. It also reboots just before recovery mode is fully loaded, so no recovery access was possible.
Board looks clean.
I tried DFU revive, SMC and PRAM reset with no success. So I finally did DFU restore. Accessing recovery is now possible, also deleting SSD was possible with no errors ( but took longer than normal ). But right after starting MacOS install, it reboots again.
I´ld like... -
Re: 820-01598 stuck at 20V 0.175A
[B]CPU_VR_EN_R[/B]: 1.8V
That´s the only enable pin I can find on U7100. Please correct me if it´s not the right one I´m looking at..Re: 820-01598 stuck at 20V 0.175A
[B]CPU_VR_EN_R[/B]: 1.8V
That´s the only enable pin I can find on U7100. Please correct me if it´s not the right one I´m looking at..Re: 820-01598 stuck at 20V 0.175A
[B]CPU_VR_EN_R[/B]: 1.8V
That´s the only enable pin I can find on U7100. Please correct me if it´s not the right one I´m looking at..Leave a comment:
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Re: 820-01598 stuck at 20V 0.175A
There´s a mistake in my last post --> Must be [B]PPVCC_S0_CPU[/B] instead of PPVDD_S0_CPU of course..
Any Idea what to check next?Re: 820-01598 stuck at 20V 0.175A
There´s a mistake in my last post --> Must be [B]PPVCC_S0_CPU[/B] instead of PPVDD_S0_CPU of course..
Any Idea what to check next?Re: 820-01598 stuck at 20V 0.175A
There´s a mistake in my last post --> Must be [B]PPVCC_S0_CPU[/B] instead of PPVDD_S0_CPU of course..
Any Idea whatLeave a comment:
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Re: 820-01598 stuck at 20V 0.175A
I nailed it down to [B]PPVDD_S0_CPU[/B] not being present. Measuring 4Ohm which looks good compared to other board.
I also took a closer look at U7100 and U7210/7220 which are creating this rail:
[B]PP5V_COREVR_VCC[/B]: 5,1V
[B]PPVIN_S0_CPUVR_VIN[/B]: 12,63V
[COLOR="Red"][B]CPU_VR_READY: 0V[/B][/COLOR]
[B]CPU_VR_EN_R[/B]: 1.8V
[COLOR="red"][B]CPUSA_FCCM[/B]: 2,5V for first 5 seconds, than going to 5V[/COLOR]
[B]PPBUS_HS_CPU[/B]: 12,63V
[B]PP5V_G3S_CPUREG_MISC[/B]:...Leave a comment:
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Re: 820-01598 stuck at 20V 0.175A
DFU restore and revive didn´t change anything.
I also checked the power on sequence diagram. [B]PM_PCH_SYS_PWROK[/B] is the last entry. So if this signal is present, everything else during power on sequence should also be fine, right?
My guess would be a CPU related problem, but I don´t know how to check if CPU is working fineRe: 820-01598 stuck at 20V 0.175A
DFU restore and revive didn´t change anything.
I also checked the power on sequence diagram. [B]PM_PCH_SYS_PWROK[/B] isLeave a comment:
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820-01598 stuck at 20V 0.175A
I´m working on a a2159 which doesn´t start anymore. It is stuck at 20v@0.175A. [B]All_SYS_PWRGD[/B] is present. [B]PM_PCH_SYS_PWROK[/B] is also present. CPU gets warm. I also get some fan spin, but nothing else happens.
No waterdamage, board looks very clean.
Not sure what to check next. Any suggestions?I´m working on a a2159 which doesn´t start anymore. It is stuck at 20v@0.175A. [B]All_SYS_PWRGD[/B] is present. [B]PM_PCH_SYS_PWROK[/B] is also present. CPU gets warm. I also get some fan spin, but nothing else happens.
No waterdamage, board -
Re: 820-01598 missing S5 state, power drop every 30 seconds
History is water damage, no more information.
slight corrosion on one of the CD3217 surrounding SMDs and on touch bar connector. Looks like water only got on the left side of the board.
Main corrosion was on touch bar connector (touch bar display is working, but touch function is not working)
Every part of the board is original. Nothing replaced yet.
I also reviewed your link but couldn´t find anything helpful.
Do you expect the...Leave a comment:
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Re: 820-01598 missing S5 state, power drop every 30 seconds
Sounds like the same issue, but also no final conclusion.
I'm able to enter DFU but not able to finish both revive or restore. It always shows an error when trying to install.
When connected to 20v supply and/or battery: can not finish due to reboot loop. Error 9
When connected only to 5v only (usb A to C cable) there is no reboot loop or voltage drop, but also no SSD voltage present-> also no DFU update possible. Error 4042Leave a comment:
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Re: 820-01598 missing S5 state, power drop every 30 seconds
[B]PP3V3_G3H_RTC:[/B] 3.31v (constantly, no drop every 30s)
[B]PP3v3_S5:[/B] 97kOhm, no short
[B]PP1v8_S5:[/B] 1.68kOhm, no short
PP3V3_G3H rail is not affected by voltage drop. It has 3.3v constantly.
PP5V_G3S is slowly fading from 5v to 4.7v every 30s (for about 2s, afterwards it jumps back to 5v).
PP1V8_G3S is jumping from 1.8v to 0v for about 2s every 30sRe: 820-01598 missing S5 state, power drop every 30 seconds
[B]PP3V3_G3H_RTC:[/B] 3.31v (constantly,Leave a comment:
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Re: 820-01598 missing S5 state, power drop every 30 seconds
[B]PP0V9_SSD0:[/B] 0.902V
[B]PP2V5_NAND_SSD0:[/B] 2.523V
Both also falling down to 0v every 30s
Re: 820-01598 missing S5 state, power drop every 30 seconds
[B]PP0V9_SSD0:[/B] 0.902V
[B]PP2V5_NAND_SSD0:[/B] 2.523V
Both also falling down to 0v every 30sRe: 820-01598 missing S5 state, power drop every 30 seconds
[B]PP0V9_SSD0:[/B] 0.902V
[B]PP2V5_NAND_SSD0:[/B] 2.523V
Both also falling down to 0v every 30sLeave a comment:
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Re: 820-01598 missing S5 state, power drop every 30 seconds
USB-C current draw after F7000 removal:
5.01V @ 0.009A
[B]PPBUS_G3H:[/B] 0V
SSD voltages (with F7000 installed):
[B]I2C_SSD_SCL[/B]: 1.8V
[B]ISNS_SSDNAND_N:[/B] 12.63VRe: 820-01598 missing S5 state, power drop every 30 seconds
USB-C current draw after F7000 removal:
5.01V @ 0.009A
[B]PPBUS_G3H:[/B] 0V
SSD voltages (with F7000 installed):
[B]I2C_SSD_SCL[/B]: 1.8V
[B]ISNS_SSDNAND_N:[/B]Leave a comment:
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