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I'm a noob, but I believe it's not possible to have image without PP3V3_S0GPU and PPVCORE_GPU neither on external nor internal screen, or is it? Do you have P3V3GPU_EN?

820-3330 from A1286 2012 There is no picture (even on external screen) and no chime, but CPU and GPU warms up. It beeps without RAM, but that's the only sign of life. Will not start in SMC bypass mode, or after SMC reset - I've never seen it running. I tried to flash the BIOS chip with known...

I feel so lame right now :D. You're right, it works now. I did not realize that I swapped wifi card with the screen assembly and it's from L2013 while the board is M2014. It works again with the original M2014 card. Also I sold the original SSD before the new LCD came to me and there was El...

820-00045 (A1534 e2015) The machine looks like a new one, not even scratched, 17 cycles on battery, no signs of spill or previous repairs anywhere, board is spotless. It was dead when it came to me, no response on anything. Initially it had 8.6V on PPBUS_G3H and S3/S0 rails were pulsing from 0V...

This is really quite confusing for me. I cannot boot from USB->SATA SSD with High Sierra (the other A1398 2014 boots with it, but this one does not even see it), but I can boot from USB flash drive with High Sierra installer, and when I do that, the wifi is working there, and also the disk...

No Title OK, got an oscilloscope. Never worked with one, but on a working machine if I measure PCIE_CLK100M_SSD_P or N, the curve and spikes looks the same as on the working machine.

I don't have oscilloscope yet, I will get one asap

U3740 with good SSD drive connected: 1. 3.42V - PP3V42_G3H 2. 1.00V - P3V3SSD_VMON 3. 3.31V - SSD_RESET_L 4. 3.42V - SSD_RESET_CONN_L 5. 0.00V - GND 6. 3.28V - SSD_PWR_FET_EN 7. 0.00V - SSD_CLKREQ_CONN_L 8. 0.00V - SSD_CLKREQ_L So I guess connecting the SSD probably solves that "mystery" with...

Yes, I mean those two are high (3V), not low. But what can cause this? I cannot find almost anything about those CLKREQ_L signals...

Hello, I've got here 820-3787 that turns on to a questionmark folder with known good drives (with High Sierra installed and running on different machine). It will also not find any wifi network in boot selection menu. USB is fully functional. I bought this machine with no video issue, but...