Magsafe power connected, not powered on: PPBUS_G3H at 12.25V PPBUS_CPU_IMVP_ISNS at 12.25V PPDCIN_G3H at 17.12V PP3V42_G3H at 3.43V PP3V3_S5 at 3.324V PP1V2R1V05_S5 at 1.104V When powered on (S0 state): PPDCIN_G3H at 16.76V PPVCORE_S0_CPU at 0.988V PPVCORE_GPU_REG at 1.005V ALL_SYS_PWRGD at 3.30V S0_PWR_PGOOD at 3.283V CPU_PWRGD at 1.059V PP1V2R1V05_ENET at 1.098V SMC_RESET_L at 3.429V PP5V_S3 at 5.020V PP5V_S0 at 5.120V PP3V3_S3 at 3.287V PP3V3_S0 at 3.278V PP2V5_S0 at 2.514V PP1V2_S0 at 1.209V PP1V8_S0 at 1.815V PP5V_S0_CPUVTTS0 at 5.11V PPCPUVTT_S0 at 1.059V PM_SLP_S4_L at 3.287V From what I can tell every single one of the voltage rails and other signal nets that I measured are all good. Battery and HDD were removed before any measurements were made. I measured the following voltage rails and important nets.
Attach magsafe power cable, continuing the hold down power button.Disconnect magsafe power cable (no battery either).To power on the board without the battery installed, I do the following (not sure what this procedure is called): To be honest the logic board looks quite pristine for its age. I did a visual inspection of the logic board but I could not find any evidence of liquid damage or any obvious corrosion or damage.
Specifications: MacBook Pro 15" late 2008 Model A1286 Logic board part number 820-2532-A Symptoms: no chime, no video, white front power LED lit, green magsafe LED lit, DVD drive spins up, battery power indicator working. Even just trying to find a schematic and boardview (component locations) files for Apple products is a real pain. I know that most people on this forum either don't use Apple laptops or likely haven't tried repairing one before, but I figured I'd try asking here since most other Apple repair communities online require a paid subscription to get help or post on their forum boards. I am trying to repair an old MacBook Pro which I acquired that does not boot.
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