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Recent content by NovemberTurtle
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Missing all power rails except PP3V3_G3H, SMC_RESET_L present 820-00875-01
Thanks for the diagnosis. What is the CPU doing with a connection to PPBUS_G3H? There is 18 volts on that bus, and cpu voltage levels should be >~1. Does anyone replace CPU or buy a new logic board? Apple wants $450, that's before they know I messed with it.- NovemberTurtle
- Post #8
- Forum: Macbook Logic Board Repair Questions
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Missing all power rails except PP3V3_G3H, SMC_RESET_L present 820-00875-01
The short was on the PPBUS_G3H_CPU branch, I isolated that by measuring the current sensing resistor's voltage drops of various branches. The CPU branch had a 3.3mV drop over 3mOhm, so that's 1A at 1.5V injection into PPBUS_3GH. I tried to find a hot spot all over the board, but nothing. The...- NovemberTurtle
- Post #6
- Forum: Macbook Logic Board Repair Questions
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Missing all power rails except PP3V3_G3H, SMC_RESET_L present 820-00875-01
Steady 20V at PPDCIN_G3H confirmed, and no PPBUS_G3H confirmed. F7000 diode mode measures 0.032V- NovemberTurtle
- Post #3
- Forum: Macbook Logic Board Repair Questions
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Missing all power rails except PP3V3_G3H, SMC_RESET_L present 820-00875-01
This A1708 had the logic board replaced in 2017 (USBC port problems, SSD not replaced), and a couple months later, it won?t turn on. Stayed on the shelf for a while, until I started to watch Youtube repair videos. I thought it must have been the TI USBC mux, so I got a USBC power meter, but that...- NovemberTurtle
- Thread
- Replies: 8
- Forum: Macbook Logic Board Repair Questions