Search results

Well for once "Rehot CPU Bro" fixed the issue. Good reflow with flux fixed this board.

No pulse at all even with my scope.

No Pulse at all that i can detect. PM_RSMRST_L - 3.3V, PM_PWRBTN_L - 3.3V, SMC_ONOFF_L - 3.4V. PM_PWRBTN_L drops to .3 v when SMC_ONOFF_L is triggered.

No start in SMC Bypass either

I was using a 85W Magsafe 1 on DC Power supply but i guess that cable has finally died. Tried a known good 85w magsafe 2 with brick and now getting Batlow but still not PM_SLP_S4_l. Or any pulsing.

Getting my ass kicked by BS PM_SLP_S4_L issues over the last few weeks. Minor Corrosion on U1950 and PP3v42 pad. cleaned up and replaced pad and chip. Corrosion on U7701 and Backlight circuit currently just removed from board. PPBUS_G3H - 8.6 V PP5V_S5 - 5V PP3v3_S5 - 3.3V PP3v3_SUS - 3.3V...

Ok. I fixed it. For some reason its perfectly happy when a battery is plugged in. Charges and runs off battery just fine too.

And i do have 3v3V on PM_SLP_S5_L

Ok this MacBook is now trolling me. Tested it this morning and now have PP3V3_SUS and PM_SLP_SUS_L. I have 2.7V on PCH_DSWVRMEN and 2V on PCH_INTRUDER_L.

Water damaged board. Main corrosion around U7100. Repaired U7100 Area and now have 8.6V on PPBUS_G3H. Pulls .02 amp on DC power supply. PPBUS_G3H - 8.6v PP5V_S5 - 5V PP3v3_S5 - 3.3V PP3v3_SUS - 0V PPVRTC_G3H - 3.3V RTC_RESET_L - 3.3V SMC_RESET_L - 3.3V PM_DSG_PWRGD -3.3V I do have 32KHz Clock...

Alright so digging into the critical update issue. Ran diode mode on both touch bar connectors and compared to a know good board. found a I had a broken line to pin 20 and 21 on J4402 for the touch bar ran yet another jumper but still getting error. Testing with a known good display and top case...

Oh and Critical update failed. Even better

So i actually got it to boot. After testing and comparing diode readings to another board it looks like U3200 wasn't getting PP3V3_G3H but the rest of the board was so after one more jumper wire we have 20v and it boots!!!!!. But its a 2016 so its got flexgate.... time to call the customer and...

Thats not what i was hoping to hear. Sounds like even more of a nightmare then its already been.

Water damaged 820-00239. Replaced U3100 and U2890 along with all resistors and caps in that area and a few jumper wires. Suck at 5v at 0amp on all usb c ports. I do have PP3V3_G3H.

Ok so after some searching looks like this board is an updated 820-01041. Have a much closer schematic now

Everything else looks brand new. Usually boards with coffee damage have trails of coffee stains on the board.

12.61v on ppbus_G2H. I dont have 3v3_sus, no luck with smc bypass. and have no good place to check for pm_slp_s4_l that matches 820-00281 boardview. On USB Amp meter it will take 20v and .3amps for a few seconds then drop to 20v at 0amp.

Customer brought in a 2019 15" MacBook Pro Touch bar with some coffee damage. Makes charger ding when plugged in but shows nothing on internal or external screen. Upon further inspection it looks to not be making it to an s0 state as cpu and gpu are ice cold and has no vcore. I know i have at...

It crashes when booting