Recent content by RDelectronics

Sorry but I don't find R7892 in the schematic (Apple Macbook Pro A1297 K92.pdf). I have it in the PCB. What's the value for this resistor? Can this make the processors heat?

PP1V1_S0GPU is stable, 1.12V. MCP_PS_PWRGD can not check it now, because it's in the uP layer and the PCB is now fitted in the chassis. But I've found that: PP3V3_S0_PWRCTL is 3.3V S0_PWR_PGOOD is 0V ALL_GFX_PGOOD_R is 3.3V And obviously ALL_SYS_PWRGD is 0V... Now let's see why S0_PWR_PGOOD...

Hot air to remove and a JBC soldering station (founded) to solder again... can this be the problem? Checked the voltage on C7771 after soldering it and it was 1.12V stable (before it was 1.16V).

Well... got the cap (330uF, 2.5V) and replaced it C7771. Did also the thermal paste job. Everything with care and discharging static... but now after reinstalling all in the chassis, it does not turns ON (not even once) and the board temperature rises noticeable (does not rise too much but...

Thanks! Will bring more news as soon as I do the honework ;)

Will do it for sure, just to avoid more problems in the future, but the voltage seems pretty stable with the DMM. Will look tomorrow with an oscilloscope too just in case. Can it be also that the thermal paste is dry after 9 years, and does not do its work correctly?

OK, removed the logic board. Removed the dust collected in the uP side. No signs of corrosion or liquid spill. Voltage on R2120/21 is stable at 3.41V on one side, 3.38V on the other side. U2801 and the Supercap C2800 are not populated :O, now I know why my laptop didn't retain the hour when...

Thanks! Got it ;)

Thanks for the tips 2informaticos. I've been trying to find the BRD file (I have the SCH) to look for those components, but I'm not able to find it. I guess those components are on the CPU side (C7771 for sure isn't it?), so the Logic Board needs to be extracted. Will take it out tomorrow...

Hi all, first post here! Thanks in advance for all the info shared in this forum and in the Youtube Channel Louis and all. Thanks to discovering this forum I'm thinking about repairing my MBP17" E2009 instead of letting it go. Let me explain the problem as much as possible to help other people...