6s plus 110mA draw steady, not tristar nor tigris
Hi! I bought this a dead 6sp thinking it was going to be an easy tristar job, but as soon as I got it it was charging normally, so I took it apart and saw Tristar had already been replaced so I replaced it just in case. DC power supply says it takes 80mA, then 110mA and stays there indefinetely. I suspected tigris might be bad so I replaced it too, then I replaced both Tristar and Tigris at the same time just to be sure.
After all this I started probing around and found a shorted cap on Chestnut’s output, so took chestnut off (and the faulted cap, of course), still the same.
At this point I was out of clues and started probing power lines. All were present but PP_GPU and PP_GPU_SRAM, but they are not shorted AFAIK. My guess is that the cpu is missing some data line (which I probed and all have normal diode mode readings) and locks up before it can tell the gpu to turn on.
Is there anything I’m missing? I’m about to start pulling off ic’s that I know could prevent the board from booting
Needless to say that it’s not recognized by itunes using a known good charge port and battery