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820-4924 - No Power, No Liquid Damage
- Thread starter bcherdak
- Start date
3V3_S5/SUS, PM_RSMRST_L, PM_PWRBTN_L, PM_BATLOW_L?
Trigger SMC_ONOFF_L and check for reaction (drop pulse) at PM_PWRBTN_L; use R5115/16 pads, instead of power button.
Trigger SMC_ONOFF_L and check for reaction (drop pulse) at PM_PWRBTN_L; use R5115/16 pads, instead of power button.
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Thank you so much for the continuous support you are giving me! I very much appreciate it.
VOLTAGE // OHMS MODE // DIODE MODE
PP3V3_S5 = 3.34v // 300Ohms and climbing // 0.1V (diode mode)
PP3V3_SUS = 3.34v // 10K Ohms and climbing // 0.425V (diode mode)
PM_RSMRST_L = 3.34v // 130k Ohms and climbing // 0.625V (diode mode)
PM_PWRBTN_L = 3.4v // 2k Ohms climbing slow // 0.5V (diode mode)
when triggering SMC_ONOFF_L the PM_PWRBTN_L = drops from 3.4 to .35V
PM_BATLOW_L = 0.1V // 10k Ohms and climbing // 0.5V (diode mode) (NO BATTERY CONNECTED???)
VOLTAGE // OHMS MODE // DIODE MODE
PP3V3_S5 = 3.34v // 300Ohms and climbing // 0.1V (diode mode)
PP3V3_SUS = 3.34v // 10K Ohms and climbing // 0.425V (diode mode)
PM_RSMRST_L = 3.34v // 130k Ohms and climbing // 0.625V (diode mode)
PM_PWRBTN_L = 3.4v // 2k Ohms climbing slow // 0.5V (diode mode)
when triggering SMC_ONOFF_L the PM_PWRBTN_L = drops from 3.4 to .35V
PM_BATLOW_L = 0.1V // 10k Ohms and climbing // 0.5V (diode mode) (NO BATTERY CONNECTED???)
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PM_BATLOW_L must be high if proper charger connected.
If not, PCH doesn't start power on sequence.
Be sure to use original Magsafe 2 60/85W charger.
If not, PCH doesn't start power on sequence.
Be sure to use original Magsafe 2 60/85W charger.
"Be sure to use original Magsafe 2 60/85W charger."
It won't even start with a fully charged original battery from a working housing/chassis. It starts for a few seconds, pressing trackpad, cpu heats up and then goes back to nothing.
Will test with a brand new charger from apple store, will go out and buy one today.
It won't even start with a fully charged original battery from a working housing/chassis. It starts for a few seconds, pressing trackpad, cpu heats up and then goes back to nothing.
Will test with a brand new charger from apple store, will go out and buy one today.
So starts at least, with charged battery?
And doesn't even start with charger alone?
And doesn't even start with charger alone?
"So starts at least, with charged battery?"
With OEM battery connected, it starts kind of, trackpad is clickable (Taptic feedback), cpu heats up, then trackpad stops clicking and cpu cools down.
And doesn't even start with charger alone?"
When no battery connected but 85w MagSafe is connected, it does not start at all.
Does not start In general, it tries to start up to post but shuts off during start up phase.
With OEM battery connected, it starts kind of, trackpad is clickable (Taptic feedback), cpu heats up, then trackpad stops clicking and cpu cools down.
And doesn't even start with charger alone?"
When no battery connected but 85w MagSafe is connected, it does not start at all.
Does not start In general, it tries to start up to post but shuts off during start up phase.
So it tries to start on charger only.
Which voltages appear in that short time?
You should be able to catch some signal reaction, triggering SMC_ONOFF_L.
No change in SMC bypass mode?
Which voltages appear in that short time?
You should be able to catch some signal reaction, triggering SMC_ONOFF_L.
No change in SMC bypass mode?
"So it tries to start on charger only."
When in the housing with an lcd connected and a trackpad and keyboard, NO BATTERY connected, it does not try to start up, trackpad is not clickable. CPU does not heat up.
When its on battery in the housing, it trys to start up, Taptic feedback trackpad clicks and cpu heats up then everything turns off.
No change in SMC bypass mode, not sure how to exactly trigger that, can you explain how to on a 2015 MacBook Pro retina 13"???
When in the housing with an lcd connected and a trackpad and keyboard, NO BATTERY connected, it does not try to start up, trackpad is not clickable. CPU does not heat up.
When its on battery in the housing, it trys to start up, Taptic feedback trackpad clicks and cpu heats up then everything turns off.
No change in SMC bypass mode, not sure how to exactly trigger that, can you explain how to on a 2015 MacBook Pro retina 13"???
"it tries to start up to post but shuts off during start up phase"
You've posted this under charger alone option...
You've posted this under charger alone option...
Bought an OEM 85W magsafe 2, CPU heats up for a few seconds then cools back down and does not heat up again only until I unplug charger and replug it in.
If I do it enough times plugging it in and unplugging it, cpu heats up and fan spins for a second and then stops.
Any other voltages looking to test?
If I do it enough times plugging it in and unplugging it, cpu heats up and fan spins for a second and then stops.
Any other voltages looking to test?
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Did you try BIOS?