2019 16" macbook pro that came to me for a diagnostic. it charged the battery up without a problem but doesn't power up. and with the battery detached it will show 20v and 0 amps on a usb-c amp meter. i went around the board looking for a short but found nothing obvious
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I have a Y50-70 gaming laptop. It has a problem where it charges up fine when the laptop is off, but when it's on, it doesn't.
I've tried a new 135w charger + new Lenovo battery and a new charging port but it made no difference.
I've updated all the drivers and still no difference.
Could it be down to a dodgy chip? I'll see if i can find a schematic and someone on here might be able to direct me where to test
Many thanks in advance.... -
Hello,
I have re-soldered the loose pins on the RAM slot which is a common fault on these models..
It charges and turns on the power LED but is missing several voltages like RAM and CPU do not come up which I believe is due to MAINON & SUSON being missing to turn these supplies on..
What I am un-sure of is what is the ITC chip waiting for to send out these signals, what are the requirements?
I have checked these lines in diode mode and they seam normal -> 600.
I have checked to see if they come on for even a fraction of a second... -
Lenovo Thinkpad W541 Wistron LKM-1 WS MB 12291-2 Works from the network and charges the battery only when it is turned off.
If you press the power button, the laptop turns on and works from the battery, but does not take power from the power supply.
If you boot into Windows and close the lid while working, thereby putting the laptop into sleep mode, the laptop begins to charge the battery.
even checked it this way: I bring a neodymium magnet to the Hall sensor during operation - the screen goes out and the battery starts charging.
Also, the laptop does not turn on without... -
Hello everyone,
I'm facing an issue with my MacBook Pro.
When it's switched off, it charges while the battery is connected. However, when it's powered on, the charging stops after a few seconds.
Another strange thing is that when I disconnect the battery and plug in the charger, the MacBook Pro turns on and runs without any issues.
I've already tried using a different OEM charger, but no luck. I even swapped the charging port DC-IN, but the problem persists.
Has anyone else experienced this issue before?
Thank you!... -
Received a macbook pro which in notification shows 7 or 10 hours until full during charging.
have replaced ISL6259 and Q7055 and still getting same results. current sensing resistors measured fine @ 0 and 2ohms. what else could be the issue?
without battery i get 12.58V. i have physically shorted Q7055 drain to source to rule out issue with the mosfet and can confirm its still the same. any suggestions?
when i shutdown it charges at only 16.5v 0.5A. during boot PSU draws 2.5-3A suggesting it momentarily charges but drops to 1.5A power draw after boot.
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