sangolossyfon
Member
PM_RSMRST_L stays high even when power button shorted
but no pulse in PM_SLP_S4_L
but no pulse in PM_SLP_S4_L
-
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
820-3115-B No Power
- Thread starter sangolossyfon
- Start date
Then you have problems with PCH.
Check its RTC signals from page 16.
Also check PCH_DSWVRMEN, PM_DSW_PWRGD, SMC_ADAPTER_EN and PM_BATLOW_L.
Check its RTC signals from page 16.
Also check PCH_DSWVRMEN, PM_DSW_PWRGD, SMC_ADAPTER_EN and PM_BATLOW_L.
sangolossyfon
Member
0.4v on SYSCLK_SYS32K_RTC
3.3v on RTC_RESET_L
edit: BOARD JUST TURNED ON when i checked voltage on PCH_SRTCRST_L
drawing 14 watts...
PCH_SRTCRST voltage was slowly dropping starting around 2v when I checked it. Seems to go up to around 1.5v then back down slowly, then spikes up...
edit- C1802 was very loose almost coming off the board...
edit: resoldered C1802, now PCH_SRTCRST_L is stable at 1.2v but not booting.
edit: bottom pin of C1802, even when C1802 is removed, is not connected to rest of PCH_SRTCRST_l. but the pad is connected to the resistor. so I will try relocating C1802 so it can be on the pad and the other side connected to ground on C2233.
edit: resoldered and now voltage on PCH_SRTCRST_L is 3.3v but still not booting
PCH_INTRUDER_L is also 2.8v
still have no idea what pins I touched that got the board to boot that one time...
3.3v on RTC_RESET_L
edit: BOARD JUST TURNED ON when i checked voltage on PCH_SRTCRST_L
drawing 14 watts...
PCH_SRTCRST voltage was slowly dropping starting around 2v when I checked it. Seems to go up to around 1.5v then back down slowly, then spikes up...
edit- C1802 was very loose almost coming off the board...
edit: resoldered C1802, now PCH_SRTCRST_L is stable at 1.2v but not booting.
edit: bottom pin of C1802, even when C1802 is removed, is not connected to rest of PCH_SRTCRST_l. but the pad is connected to the resistor. so I will try relocating C1802 so it can be on the pad and the other side connected to ground on C2233.
edit: resoldered and now voltage on PCH_SRTCRST_L is 3.3v but still not booting
PCH_INTRUDER_L is also 2.8v
still have no idea what pins I touched that got the board to boot that one time...
Last edited:
"PCH_SRTCRST_L is stable at 1.2v"
Not good, is better to replace C1802.
Be sure PCH_SRTCRST_L goes to PCH; if broken trace, board can't start.
Not good, is better to replace C1802.
Be sure PCH_SRTCRST_L goes to PCH; if broken trace, board can't start.
sangolossyfon
Member
like I said in my final edit PCH_SRTCRST_L was 3.3v and I did end up replacing C1802, but I will check the trace, could I be getting 3.3v if it wasn't connected to PCH?
sangolossyfon
Member
The board now turns on consistently after I pushed down a little on R1802, probably some damage to the PCH_SRTCRST_L line in that area. the voltage on that line is still 3.3v. SO I guess it's working...