Measure the same on the working board.
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Yes I have approximatively thé same (210) on thé working OneComment
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I add antother things that i just discovered.
I tried a test using an external screen connected via HDMI.- If everything is connected (trackpad, display, and SSD) + HDMI plugged in → crash + boot loop (sometimes I reach the login screen, sometimes not)
- If only the trackpad is disconnected + HDMI plugged in → crash + boot loop (sometimes I reach the login screen, sometimes not) + see image
- If only the internal display is disconnected + HDMI plugged in → no problem, fast and stable boot
If i disconnect the HDMI
If everything is connected (trackpad, display, and SSD) --> BOOT LOOP
If only the trackpad is disconnected --> BOOT OK (if i plug HDMI direct crash)
Attached FilesComment
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Nobody ?
Can it be U7650 (buck converter) or U8210 (Fets) that convert PP5V_S4 to PP5V_S0.
i say that because, i measured on time 8-9v on PP5V_S0 line that is not normal.
Thaaaaanks
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Hello,
i have used the search function but i doesnt found my problem.
I am reparing a MacBook Pro A1706 with the Boardnumber 820-00923-A.
If i have the display and/or the trackpad installed the Macbook does not boot, i have 20V and 0.03 Amps at the charger (without the battery connected), i can post a video of the Amperemeter if this helps.
The board has PPBUS_G3H and it seems it is in the S5 state (i have the voltage on the S5 rails but not on the S4 rails).
If i connect the charger without die display and the trackpad installed... -
Hello all... TV started boot looping. Opened the back panel and tried to isolate the problem. Just PSB no boot loop. PSB and MB no boot loop. Plug in the LVDS from panel to MB and boot looping starts up. It doesnt matter of order that I plug the LVDS ribbons back in, only 1 and no boot loop but as soon as 2nd one plugs in boot looping. I then noticed a flicker on the screen when I was closing the clip on the harness to the LVDS. Shut the lights off so I can see better, and I noticed as i slowly close it, I will get a picture, but as soon as it clips in, I lose picture and booting happens. So I... -
hi all, got this macbook that looks perfectly clean. no visible liquid damage or burned component that boot loop. if i try to enter diagnostic , it reboot too after a while.
owner want to recover data, so im asking if i try a dfu (dunno ifi can do it in that model) do i loose all data ?
what can cause cpu to get very hot from the beginning ?
generally i fixed some boot loop by reprogram bios, of do a ssd SOS task from recovery menu, but before i start doing things, it's better listen to someone that had this problem on that model
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Hello All,
I was handed a 2019 MacBook Pro A2141 that is boot looping. There is never a display or backlight but there is a chime about every 8-10 seconds.
I plugged in a USB-C meter and it see that it is negotiating 20 volts but there is no current draw at all. Voltage is stable, no resets.
It appears that the battery has a charge but possibly is not charging.
The following voltages are present:
PPBUS_G3H = 12.61V
PP3V3_G3H = 3.33V
PP3V3_GH3HRTC = 3.33
I haven't worked n one of these before so I have limited experience with... -
Samsung QLED QN50Q — purchased 2022 started experiencing a delay in the picture coming on in the morning less than 2 years later. Did not know the term boot loop at that time. As the loop delay ran into a few minutes did all the recommended troubleshooting, soft and hard reset, changing cables and outlet locations, no help. As the delay increased contacted Samsung tech group and allow them remote access the tv. Tech was moving too fast to see exactly what he was doing but this ultimately it was also no help. Lived with the delay until it stretched out over 6 hours. Pulled of off the back cover...
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