Do you get VCORE?
Check all coils voltage and pages 57/58.
Try to start in SMC bypass also.
Check all coils voltage and pages 57/58.
Try to start in SMC bypass also.
-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
MacBook A1466 2015 820-00165 No Fan Spin.
- Thread starter arshees
- Start date
No need to check any S3/0 voltage, as you don't get L7520 voltage (5V).
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
Sorry but you'll have to guide me thru this one.. please tell me the procedure. How do i trigger SMC_ONOFF_L and can i check for drop pulse with a multi meter?
I just checked voltage on L7520 when i power on. it gives me 5.1v when fan spins and then drops again 5.1v fan spins and drops.
SMC_ONOFF_L has 3.41v.
I just checked voltage on L7520 when i power on. it gives me 5.1v when fan spins and then drops again 5.1v fan spins and drops.
SMC_ONOFF_L has 3.41v.
As you must work with board alone on the desk, R5115/16 pads can be used instead od power button.
In fact, solder a wire on a convenient point of SMC_ONOFF_L and temporary touch the ground, simulating power button action.
Voltmeter should note PM_PWRBTN_L dropping from 3V to 0V at same time.
In fact, solder a wire on a convenient point of SMC_ONOFF_L and temporary touch the ground, simulating power button action.
Voltmeter should note PM_PWRBTN_L dropping from 3V to 0V at same time.
If fan spins, this means the board tries to start at least.
Check if voltage appears on all big coils at that time.
Also try to start in SMC bypass mode.
Check if voltage appears on all big coils at that time.
Also try to start in SMC bypass mode.
"Check if voltage appears on all big coils at that time."
Did you really check for pulse at ALL big coils???
Did you really check for pulse at ALL big coils???
That means you have problem with some SMC sensor level.
Check the pages 41/42.
Check the pages 41/42.
Removed and re soldered U7100 and I have a perfect working board. Boots up and working fine on adapter but randomly shuts down when running on battery. Sometimes works for 5 minutes and sometimes just shuts down before the boot process completes. No problems when it's running on adapter. Any ideas what i should check?
First step, try known good battery.
Start in SMC bypass, disconnect charger and check if still turns off with battery alone.
Fan must start with full speed in SMC bypass mode.