UPDATE:
PP3V3_G3_RTC shorted to ground = Game Over, BAD PCH
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Mac Mini A1347 (820-5509) PM_SLP_S5_L missing
Hi everyone,
I've been troubleshooting a Mac Mini A1347 (820-5509) that came in for a simple thermal paste replacement, but it turned into a challenging repair. I've made some progress, but I'm stuck at a point and could really use some advice from those more experienced with this board
Worked fine for a week, then started powering on intermittently.
What I've done so far:
• Found PP3V3_G3H in short.
• Removed and replaced an AND gate (74LVC1G08) and an OR gate, which were causing issues on the line.
• Found VREG5 at 26 ohms on TPS51980. Replaced TPS51980.
• Now I have stable PP3V3_G3H and PP5V_G3H.
Current situation:
• PM_SLP_S5_L is stuck at 0V, as is PM_DSW_PWRGD.
• SMC seems operational (SMC_RESET_L is 3.3V, PM_P3V3_G3H_PG is 3.3V).
• TPS51980 isn't generating PP5V_S4_REG, likely due to no enable signal on EN2.
Looking for advice:
I'm stuck at this point and would appreciate any pointers on how to continue troubleshooting. What should I check next to get the SMC to release PM_SLP_S5_L and advance the power sequence?
Thank you in advance for taking the time to read this and for any advice
schematic:
https://drive.google.com/file/d/1ufr...ew?usp=sharingLast edited by microitech; 12-21-2024, 12:04 PM.
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hello, I encountered an issue with the mac mini a1347 mid 2011 with the motherboard model being 631-1740. I tried to upgrade its dual hdd setup with ssds and upgrade the ram to 16gb. I also took apart the whole thing to replace the thermal paste. after putting everything together, it refuses to power on. I have no idea what the issue is and no idea where to start. I did check the voltage at the motherboard connector and I do get 12 volts. what else should I check?12-15-2025, 09:56 PM -
I saw this thread https://www.badcaps.net/forum/troubl...1347-late-2012 but the board number is different.
Mine is 631-1993 2012 i5 2.5Ghz mac mini. I've searched a couple of days. I tried search back a few months ago. I can't seem to find the brd for that exact board. Any help is appreciated.01-08-2025, 10:26 AM -
Dear Team
I'm replacing a hard drive on a Mac Mini A1347 (2014) (820-5509). I reinstalled it and got three beeps at startup.
I tried a PRAM reset, but it didn't go through the three beeps.
I removed the battery, no change.
I examined the logic board under a microscope, but I didn't see anything.
Can someone please tell me what to do or what to look for?
Thanks everyone.10-14-2025, 06:48 AM -
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