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yes, i did flash again but still getting the same outcome.

Replaced another PCH. i have good news! i have PLT_RESET_L and my CPU Vcore is 1.76V CPU Heats up so i know its running. BUT! i now do not have GPU_GOOD. no chime no display no light on LED0303. only lights on at LED0302 and LED0301 Sorry man this is taking so long. i appreciate your assistance...

Yes i do get REG_CPUVCC_PGOOD, yeah earlier i said i didn't know where on it on schematic. and i have 3.3v on this line

R8430 has 22k i'm getting 1.34V on PVDDQ_S0_FET. the board reboots not only when i touch PM_PGOOD_FET_P1V35_S0 line, it also happens when i touch R8535 pin2/PM_EN_REG_CPUVCC_S0 side as well

Sorry, system running as in I only have led0302 still no gpu good. And no cpu activity

so.. weird thing happened, system was running, fan spinning, as soon as i put my probe on R8430, it shuts down and reboot. this is repeatable, and no i did not short something out. i leave my probe on the point, system starts up. shows me 3v3v. remove and probe again, shuts down

so follow this chart for power up sequence https://logi.wiki/index.php/Bootup_Signal_Order i'm getting stuck at CPU VR Ready that's why i'm missing LPC_PWRDWN_L. but i can't find CPU_VR_READY in the schematics.

PM_MEM_PWRGD is 0.8v edit PPVCCIO_S0_CPU and CPU_VIDSCLK is also 0v

U8600 all pins 3.3V except ground. same goes for U8601

PLT_RESET_L is 0v same goes for the RAM, tried each slot and swap them with known good. also flash with good bios same.

ok did clean ME(First time though so many tutorials and each of them different) https://drive.google.com/file/d/1Cl5HcbQ3GCMmZpsEqtNbyOyHceFcg6YH/view?usp=sharing yes LED0302 is steady ON and i'm getting 1.7V on CPU Core but it i'm getting no HEAT coming from the CPU.

heat and still no luck.. gonna get it replaced and see

This board does not have dedicated gpu. Getting worries now lol

got PCH replaced, turns on now, FAN SPIN... but no GPU_Good. need clean ME?

PM_EN_REG_GPUCORE_S0 = 3.27 PM_EN_REG_GPU_VDDQ_S0 = 3.27 PM_EN_REG_GPU_P1V05_S0 = 3.27 PP1V5R1V35_S0_GPU_REG = 1.5v PP1V05_S0_GPU_REG = 1.05v PM_PGOOD_REG_GPU_VDDQ_S0 = 3.27 PM_PGOOD_REG_P1V05_GPU = 3.27 PPGPUCORE_S0_REG = 0.9 GPU_GOOD = 0 hmmmmm all looks good to me

Short on p3v3_g3h_pmu_vddmain... heating up from U7800.. are these replaceable?

Hello, IMAC came in with no boot in the first place. replaced Q7950 and start up now. right now i have FAN Spin but no chime and no image, only LED 1 and 2 comes up. i have VCore on both CPU and GPU(0.8V). what else do i check?

My mistake there for copy pasta~, for the SYSclk i have 32khz wave using o-scope.

1. PPVRTC_G3Hx (VCCRTC) PP3V3_G3_RTC 2. RTC_RESET_L (RTCRST#) RTC_RST_L 3. PCH_SRTCRST_L (SRTCRST#) 4. PCH_INTVRMEN_L (INTVRMEN) 5. PCH_DSWVRMEN_L (DSWVRMEN) 6. SYSCLK_CLK32K_RTCX1 (RTCX1) 7. PP3V3_S5 (VCCDSW3-3) 8. PM_DSW_PWRGD (DPWROK) 9. PP3V3_SUS (VCCSUS3) 10. PM_BATLOW_L...

didn't know smc bypass works for IMAC as well. well this time the LED didn't blink but stayed lit all the time. still no boot