this machine was powering on even after a cola spilled on it. i decided to clean it for safe measure and now it doesn't power up. i found short to ground on pp3v1_rtc. i'm new to the touchbar logic boards. i looked at the schematic but i'm still lost as to which chip creates pp3v1_rtc and is it safe to inject 3 volts since this rail goes directly to the cpu
-
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
820-00840 short on pp3v1_rtc
- Thread starter kjchatman
- Start date
Voltage comes out from U7800.
And can be PCH, or U7800 fault.
If is not really short, then is possible to be crap under one of it; put good flux and heat for test.
If is a very low value (000-003), you can try injecting voltage.
There are also 2-3 caps which you can check fiest.
And can be PCH, or U7800 fault.
If is not really short, then is possible to be crap under one of it; put good flux and heat for test.
If is a very low value (000-003), you can try injecting voltage.
There are also 2-3 caps which you can check fiest.
R1401 has 1M, so cannot generate such fail.
But if you have short to ground in two different points of PCH (VCCRTC and INTRUDER) that points to bad PCH 100%...
But if you have short to ground in two different points of PCH (VCCRTC and INTRUDER) that points to bad PCH 100%...
"put good flux and heat for test."
But I doubt it will help in this case...
"all i did was ultrasonic the board"
No sweep function???
How many minutes left the board in the UC?
But I doubt it will help in this case...
"all i did was ultrasonic the board"
No sweep function???
How many minutes left the board in the UC?
Does it work now?