MacBook Pro A1708 820-00840 stuck @ 5V, no power, no charging
Hey guys, I need a little help here. I have a MacBook Pro A1708 820-00840 stuck @ 5V. Started off affecting just one port but now it's affecting both. Both CD3215 ics were replaced but the issue remains. One port does a loop and the other stays at a constant 5V. Both CD3215 have 3V incoming. I checked for PP3V3_G3H @ R3000, C3100 and C3108, R3001, C3200 and C3208. The weird thing is though that the ammeter shows the current draw (5V @ 0.5A) coming out from the port as opposed to it going in. Any ideas on helping me fix this?
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Remove all power. No battery. Meter in resistance mode. Measure the resistance to ground of PPBUS_G3H @ fuse F7000 (check both sides). What is the resistance in ohms? -
No shorts here. What is the voltage to ground on PPBUS_G3H?Comment
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No. Asking about the voltage here. Meter in DC volts scale of 20v or higher. Red meter probe on PPBUS_G3H. Black meter probe to ground. What is the voltage? Is it stable?Comment
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What is the voltage to ground on D6905? Test each pin. Post each measurement.
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Remove all power. Meter in resistance mode.
What is the resistance to ground of PPDCIN_G3H_CHGR in ohms?Comment
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I also checked these following a CD3215 boot sequence guide and they are all present:
PP3V3_UPC_XB_LDO
PP1V8_UPC_XB_LDOD
PP1V1_UPC_XB_LDO_BMC
PPDCIN_G3H
USBC_XB_CC1
USBC_XB_CC2Comment
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Meter in DIODE mode. No power to the board.
Confirm that the dual diode @ D6905 is ok. Red meter probe on pin # 1; black meter probe on pin #3. Meter should conduct.
Reverse the meter leads and the meter should block.
Repeat to test pins #2 and pin #3 in the same way. We want to check that D6905 is leaking and allowing for a reverse voltage to travel through the part.
Also, what is the voltage to ground of PPDCIN_G3H? Is it stable?
Last edited by mon2; 04-11-2025, 02:49 PM.Comment
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Also, what is the voltage to ground of PPDCIN_G3H? Is it stable?Comment
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Which port on the board is cycling? Share the index name for the part.
Even 4v5 is too low since the USB-C (official) will supply 5v or slightly higher. Would have a thermal camera?Comment
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Highlighted is the looping port. Yes I have a thermal camera and voltage injection tool / short killer. Point me in the right direction.Comment
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To me, there is a shorted part onboard in this region since the VBUS is not the text book 5v for each and every permutation of the USB-C port.
Revising...I am going cross-eyed and referenced the wrong schematic. Will review this later and update with suggestion by tomorrow. Late at the office now.
Suggest to investigate the VBUS of each of these USB-C ports. Check their resistance to ground. One of these is with a shorted part onboard since the 5v from PD adapter is sinking to 4v5 which is too low.Last edited by mon2; 04-11-2025, 04:56 PM.Comment
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Hi,
I have a MacBook Pro 13 inch A2238 M2 and it was stuck 5V with 0 amps. I measured some important lines and I found a short on PP3V8_AON_MPMU_ISNS_VIN, I tried injecting 1v and I saw heat coming from the mPMU so I removed the pmu thinking that was the problem. I don't know why I didn't check the other side of the border but there it was, a shorted cap. I replaced the cap and the short was gone, so I reballed the PMU and put it on again but voltage was still stuck at 5V and the current was fluctuating between 0 and 0.45 amps. I checked under the thermal camera and I saw the mPM...04-02-2025, 05:02 PM -
Hey everyone,
I’ve got a MacBook Air A2179 that got some water damage through the keyboard. Now it powers on, shows the Apple logo, but just stays stuck there — no startup chime, no keyboard backlight, and no progress bar under the Apple logo.
When I try to boot into Internet Recovery (Option + Command + R), the mouse cursor is extremely slow and laggy — like when I lift my finger off the trackpad, the cursor keeps drifting slowly for a second or two.
I opened it up and found some corrosion around the LED driver IC area on the logic board. I cleaned... -
Dear friends,
a close friend of mine gave me this machine, she told me that the last days the fan was going high and that it was heating up too much for the usual things, and that suddenly one morning it didn't start anymore .
I opened it and inspected carefully with a high magnifying lens, found no oxydized spots but a short on PPBUS_G3H , then a blown U6903.
I changed U6903 with a new one, PPBUS_G3H became 558 (measuring with red probe to gnd , and black on F7000) , PP3V3_G3H_RTC 463.
Now when I plug the usbc cable (original Apple 61W power supply), nothing starts automatically,... -
Hey guys,
I got a MacBook Pro a1989 820-00850-A dead for repair. The MacBook itself was off for a month or so and it didn't power on. I tested using ammeter and it was stuck on 5v. Opened the machine and found a short on ppbus_g3h, corrosion near the right spkr_amp. removed the spkr_amp and saw short on ppbus_g3h. plugged in to power, boosted to 20v .600A and then back down to .300A. Trackpad was clicking when on .600A but no image etc.
Later, I tried again but it dropped down to 5v and never boosted back to 20V. checked board again and found ppbus_g3h shorted again....10-06-2025, 08:45 AM -
Good day, friends. Got this problem with M1 macbook - it starts, chimes, tries to boot and stuck with a message "support.apple.com/mac/restore"
It works with DFU mode, but it's cannot be restored. With "revive" function - same problem. Internal restore mode doesn't work, as well as Internet Recovery.
There is no damage on the motherboard. No short circuits.
Could it be a NAND problem? (but usually, if NAND is dead - mac simply wouldn't turn on)
Thanks....10-08-2025, 02:55 AM
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