MacBook A1707 820-00928

[PITERPENY]

I need help. There is no image on either the internal or external display. The MacBook is charging and the fans are spinning. The touchpad is clicking but the caps lock is not lit. I suspect the U1100 or UA000, tell me what to check?

[PITERPENY]

no ideas?

[mon2]

Check if PPBUS_G3H and 3V42 are stable.

[PITERPENY]

Check if PPBUS_G3H and 3V42 are stable.

3V42 ?
PPBUS_G3H =12.63V
PP3V3_G3H=3.3v

[mon2]

Have you attempted a DFU?

[PITERPENY]

Have you attempted a DFU?

dfu? on 1707?! unfortunately T1 is not compatible with this technology (mon2 is overworked))

[mon2]

Yup, indeed. Trying to convince my wife of the same. Just wasted 3 days debugging a fleet of Tapo security cameras at the office that just 'died' but only for streaming. The issue...drumroll..a corrupt SanDisk SD card. The so called professional grade SD card is not being detected at all and blocked the hub from streaming. Life sucker. Now TP-Link wishes to see a log from the SD card. Exactly how? The SD card is dead.

In the end, it is the same ole..check if your bios is corrupted.

Can you pram reset and hear a chime? Do you see the USB mouse light on if using an external?

Do you have a touchbar on this unit?

What is the voltage to ground of ALL_SYS_PWRGD?

What is the voltage and current draw on the USB C meter?

[PITERPENY]

ALL_SYS_PWRGD=3,218V
USB C meter= 20V/ 1.047A (no battery)

[mon2]

That is a nice current draw. Try to boot from an external drive and OS.

You did not answer if you hear a chime during boot. PRAM reset works?

[PITERPENY]

That is a nice current draw. Try to boot from an external drive and OS.

You did not answer if you hear a chime during boot. PRAM reset works?

no sound,
PRAM does not work
touchpad clicks but caps lock does not work,
SMC bypass and reset do not work,
BIOS from another MacBook does not change the situation
external disk with OS turns on but the indicator does not blink, it just lights up

[saisoni20]

no sound,
PRAM does not work
touchpad clicks but caps lock does not work,
SMC bypass and reset do not work,
BIOS from another MacBook does not change the situation
external disk with OS turns on but the indicator does not blink, it just lights up

PITERPENY Did you fins any solution. I have mac with same problem.

[mon2]

ALL_SYS_PWRGD=3,218V
USB C meter= 20V/ 1.047A (no battery)

The pull-up voltage may be a hint here and appears to be low. This should be @ ~3v3.

Also, is the current draw an immediate spike to this value or does it climb up to this measurement? If immediate, there is a short on the board.

Remove all power. Meter in resistance mode. Measure the resistance to ground of:

PP3V3_S0_LEFT
PP3V3_TBT_X_S0 ; should be the same measurement as above

Confirmed..see attached.

[saisoni20]

mon2 Do you have power sequence as posted above for A1708?

[mon2]

See attached for the A1708 power sequence.

[saisoni20]

mon2 Thank you so much