Recent content by DaveDD

So nothing that I can do? :(

PLT_RST_L comes high after a few seconds and stay high at 3.33v stable

tried 5 or 6 different bin files. I get 0v with most of them and a weird 0.85v. The last one that i tried led me to the same point: steady 1.08v I'm working with board alone on my desk.

Hi all! Came in this 820-00239-09. No signs of corrosion, MB looks perfect. Customer report that the machine works perfect yesterday evening, but this morning macbook won't turn on. CPU Vcore steady at 1.07v measured on L7210/L7220 so no boot I guess. with another bin came from this forum...

Hi guys. First time on this kind of board. U3000 blown. Removed and traces underneath are fine. USB stuck at 5V 0,50amp on three of the four usb-c port. Bottom port on the side of U300/U400 drain only 0,15amp. Where should I start checking? Thank you

Hi guys. This motherboard came in with liquid damage. Replaced some burnt component . Now I have Magsafe light. PM_SLP_S4_L and ALL_SYS_PWRGD pulsing every 5 second. if i remove U8030 then PM_SLP_S4_L stays high. Need some advice here Thank you

C6455 was bad. Get warm injecting 1v in PPBUS_G3H line. Replaced and everything works like a charm. Thank you.

On big coils I have 1,5ohm (with small differences between them). pure 0,000 - 0,001 short on F7001.

Hi all! Customer report sudden shut off while working. No signs of spills and no damage. It draws 5v - 0,02A from all USB ports. Found pure short of PPBUS_G3H (0.000 on diode mode, 0ohm). As you told me in an old case is safe to inject voltage to find the issue since is pure short , right?

Changing the SSD solved everything. With the customer SSD, even if the drive is totally wiped, even with Windows installed on It, the fan goes up at max. With another but IDENTICAL model , MacBook works like a charm. Today lesson: SSD can trigger fan Speed even if it seems to be ok, and no...

No issues with Usb MacOS. I've already wiped SSD drive and reinstalled Macos before, but issue still remain. Now I'm trying with a different SSD from donor... i'll keep you updated. With battery connected, Trackpad is OK in system preferences. Why I need battery to show up that?

Late post for an already solved board issue. I forgot to reply last time... Just to share my experience with the forum, maybe can help someone in the future. Issue was simple. Fake/not working CD321500C chips. Bought them from a thrusted seller, i've already bought those in the past from this...

Hi guys Very tiny liquid damage. Macbook came in with a problem on SMC Reset. Everytime the power button was triggered, smc will perform a reset and macbook will not start . I Fix it and now it works but fans goes high speed. Tested with only trackpad, I/O Board, fan connected. Already tried...

Back again on this board after a busy week. so LDO_BMC on U3200 and U3100 did not get to 1,1v when adapter is connected. U2890 is missing clock. I don't have an oscilloscope but the measurement on Pin 1 of R3095 stays stable at 0,2v. On the other side, on pin 1 of RB280 i have 1,1v but I see...

I've also checked J3300 and JB500 diode mode reading, everything is OK according to logikiwi EXCEPT pin 23 on J3300 USBC_XB_USB_BOT_N measure 1.010 in diode mode instead of OL. Edit: fixed by changing diode.