A1707 820 281 jumps from 5v -16v on amp meter then restarts

[jma46]

Hi sorry to Hijack this thread, I have an A1707 820 281 which jumps from 5v -16v on amp meter then restarts, I have checked big coils for shorts, ppbus and all seems ok. Im thinking there is a short which is causing it to reboot but I'm out of ideas? Also another A1707 where the internal SSD is not showing in terminal or disk utility? No excessive heat from SSD chips?
Thanks in advance for any suggestions

[jma46]

Removed R6907 and now sometimes reaching 20v but not stable and still rebooting 5v 14v 20v? Suspecting U7000

[mon2]

Would you have a thermal camera? Check for who is heating up.

Measure the voltage to ground of PPBUS_G3H @ F7000/F7001. Check both sides of the fuses. What is the measurement?

Remove all power. Meter in resistance mode. Measure the resistance to ground of F7000/7001. Post each measurement.

[jma46]

Yes I have one, but nothing heating up
F7001 pin 1 4.59v 16v and drops pin 2 4.5v 5.1v and drops
F7000 pin 1 4.59v - 17v and drops pin 2 4.59v -16v and drops
Both constantly fluctuating and not stable
F7001 pin 1 1.3Kh and dropping slow pin 2 1.168 Kh
F7000 pin 1 1.062kh pin 2 1.129kh
Dia mode F7001 / F7000 .430 both sides both fuses

[mon2]

Remove both fuses and check if PPBUS_G3H is stable or not.

[jma46]

Almost the same with fuses removed, sometimes goes up to 20v sometimes 14v - 16v ? 96w charger etc?

[mon2]

Should have asked that earlier. Are you using a stable usb c power with a 100W rated cable? Test with 100W adapter of the recommended Apple adapter. Let us rule out the power source.