hi there i have a macbook pro a1278 which is not charging it has green light power no amber or charging. i already replace charging ic but still not charging. i know i have missed something. here i found out that the output voltage from the battery connector has 11v and drops to 0.47v
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Re: a1278 green light with power not charging help
here is the picture
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Re: a1278 green light with power not charging help
1) post or link the schematics for the logic board if on this forum.
2) post the exact part number for your logic board. It should be of a 820-xxxx format.
3) is the battery a known good battery? Often, the battery is the fault.
4) locate the battery connector. Meter in dc volts mode. Measure the voltage of each pin to ground. Post each measurement. Attach the battery for these readings.Comment
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Re: a1278 green light with power not charging help
board id 820-2936 b
j6950
pin 9,8,7 = 14v drop to 0.47v
while q7035
pin 5 chgr phase shorted to pin 3,2,1 if it has partsComment
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Re: a1278 green light with power not charging help
Post the other voltages on the battery connector.
Do not attach the battery yet. Use only the power adapter.Comment
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Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hello every one, i have bought macbook air M2 but not power on,
try shift + option + control + power -> the webcam green light is on but not thing happen.
anyone have ideas of this ? -
So Ive got a Macbook Pro here with no power or charging light.
I have taken the board out and did an inspection and found a small bit of water damage on C1267 (PP1V05_S0). Cap fell off as I cleaned the area but I dont think this is responsible for my no power or light issue, and should probably work just fine without it.
So after watching a few Louis Rossman videos and some post here with similar issues, Ive done a lot of testing and have found the following values of the main lines I think are important:
PPDCIN_G3H = 16.63V
PP18V5_DCIN_FUSE = 16.63V... -
Hi, I have a MacBook pro A1278 (820-3115-B) that has green light on the charger and does not turn on, the fan does not spin.
The voltages in the SMC seem correct. I have made voltages measurements on the main coils and I put their measurements here:
L7220..........3.3V
L7260...........5.12V
L7330..........1.5V
L7030..........12.67V
L3895..........2.5V
L7760..........1.80V
L9701..........0V
In the following coils they give me continuity with ground, which seems strange to me:
L7550,L7510,L7520........ 0V
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Hi. Troubleshooting a macbook A1278 logic board that was working but owner was complaining about random turn off during use issues.
Now the logic board will not power on for the fan spin.
Magsafe power adapter is fine @ 16.x volts; green light on adapter is lit (always).
If the battery is docked, see the 3v42 rail ok. Remove battery, power adapter yields the same working 3v42 rail.
Have not checked all of the power rails but PPBUS_G3H is active @ 12v6.
The concerning rail (reviewing this one now) is that PPVCORE_S0_CPU_REG...
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