Recent content by kronos23

SMC_RESET is 0.006 so dead SMC. Reflowed didn't work.

Hi guys. Working on a 820-00138 board with liquid damage. No green light on adapter. Cleaned up and replaced U5110 and surrounding components. PPBUS_G3H - 12.26v PP3V42_G3H - 3.409v SMC_BC_ACOK_VCC - 3.409v SYS_ONEWIRE - 3.387v Made sure I am using original 85w Magsafe 2 however I only get...

Found R7005 to be blown. Replaced it and the board powered on and then died with in 10 seconds. Green light faded away and PPBUS_G3H short returned until I removed Q7035 again. Something on the circuit is blowing Q7035 and creating a short but I cant figure out what it is.

Replaced U7000 and the FETs all at once. No more short but PPBUS_G3H is only 0.080V. I am not getting a blinking green light on the magesafe. Resistance between pin 17/18 on U7000 is 3 ohms. Think it should be 2 right ? So I replaced R7051/52. Same results Resistance between 27/28 is sitting...

Hi Duke. I confirmed continuity between Q7035/30 and U7000, those traces are good. I took some diode mode readings at U7000 while it was removed. Not sure if these can help. 1 - OL 2 - OL 3 - 1.577 4 - 0.584 5 - OL 6 - 1.020 7 - OL 8 - OL 9 - 1.542 10 - 0.616 11 - 0.616 12 - 0.331 13 - OL 14 -...

Hi Guys. Working on a 820-3115 with no power no green light. Liquid damaged in the U7000 and Q5480 area. I replaced both of those components and surrounding caps/resistors. Found a short on PPBUS_G3H that I tracked down to CHGR_PHASE on Q7035, when I removed it the short went away. I also...

Hi. I am working on a 820-3476 board with no power. All S5 rails are present but missing S4 and below. I found that PM_SLP_S4 is missing so I traced that back to the CPU. Found that PM_PCH_SYS_PWROK is missing. Checked for ALL_SYS_PWRGD is missing as well. Based on schematic, this signal is...

Hi All, I am working on a Mac Pro 2013 model that is not posting. I found a single corroded component on the CPU riser card that I believe is the culprit. The problem is, I have no board view, schematic or donor boards available for this machine. The component is in the bottom left vicinity of...

Thanks Louis, I think this might be it. IHSC type : current low-limit: 0.0A high-limit: 0.05A Description: Debug TBT T29 Current Reading: 0.804A Noise-Tolerance: 1.0 The thing is I worked on that area for a while, meticulously replacing components but I only got one of the ports to work...

I have a 820-3662 that suffered liquid damage. The unit was badly liquid damaged in the eDP connector area, audio and thunderbolt. I removed the damaged components and soldered a new connector. The unit powers on a works fine except the fans always spin at max RPM but only after the OS is...

I have a 820-3476 with no power but orange light on magsafe. Tracked it down to a short PPBUS_G3H under Q7630. When I removed the component, the short is still present and there seems to be soon peeling of the upper layers on the board. See attached picture. Is it salvageable ?

Woke up this morning to find it dead. Now no power at all. Orange light on. SMC_Reset_L present at 3.4V but doesn't seem to go low. Checked R5100 and R5127 and they are both okay.

I have a 820-3437 with no power button. The unit powers on when the charger is connected with the battery plugged in, light goes amber, fan spins and stops 3 times then the system powers up and works as expected. I cannot turn it off or on using the power button. I disconnected the IPD Flex and...

The keyboard is working but covered in corrosion.

On L5800 I have 5V on pin 1 but nothing on pin 2 Based on schematics and board view I should have a filter there however these just look like test points ? Im confused.