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820-00165 no fan
- Thread starter VinceLx
- Start date
3V3_SUS is there?
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time).
Check for pulse at PM_SLP_S4_L, at same time.
Do the same for PM_SLP_S4_L?
If pulse present, check for pulse on all power rails controlled by PM_SLP_S4/3_L.
If pulse present, check for pulse on all power rails controlled by PM_SLP_S4/3_L.
Yeah, you confirmed enable signals.
Don't you want to know if corresponding power supplies send out correct voltage too?
Don't you want to know if corresponding power supplies send out correct voltage too?
Check for pulse at pins 7 & 3 of U1950.
Any pulse at PLT_RESET_L?
Any pulse at PLT_RESET_L?
Pulse on pin 7 ok, no pulse at pin 3.
I had pulses on SMC_DELAYED_PWRGD, but not at each trigger of SMC_ONOFF_L
Removed U1950, I got a couple of pulses on SMC_DELAYED_PWRGD, then no more. Do this pulse should appear at each SMC_ONOFF_L trigger?
R5191 ok
Fan spins first low speed a few seconds then high speed when I put the scope probe on pin 7, with power supply giving 200mA
What can I do about SMC_DELAYED_PWRGD not always there?
I had pulses on SMC_DELAYED_PWRGD, but not at each trigger of SMC_ONOFF_L
Removed U1950, I got a couple of pulses on SMC_DELAYED_PWRGD, then no more. Do this pulse should appear at each SMC_ONOFF_L trigger?
R5191 ok
Fan spins first low speed a few seconds then high speed when I put the scope probe on pin 7, with power supply giving 200mA
What can I do about SMC_DELAYED_PWRGD not always there?
Tie together pins 5 & 6; test again the board.
I tied them without U1950, and for some reasons I had pulses on SMC_DELAYED_PWRGD
Reinstalled U1950, I could start the board (blinking folder) by triggering SMC_ONOFF_L, with power supply giving 700mA, a bit higher than normal. The board did not start alone when giving power.
When trying later again: impossible to start.
Then I tied together pins 5 & 6 with U1950 present, I have pulses on pins 7 and 3, but the board does not start, SMC bypass or not, just fan spinning 1 second, as before.
Reinstalled U1950, I could start the board (blinking folder) by triggering SMC_ONOFF_L, with power supply giving 700mA, a bit higher than normal. The board did not start alone when giving power.
When trying later again: impossible to start.
Then I tied together pins 5 & 6 with U1950 present, I have pulses on pins 7 and 3, but the board does not start, SMC bypass or not, just fan spinning 1 second, as before.
Cold, the board does not want to start. Again, no pulses on SMC_DELAYED_PWRGD
I tied again together pins 5 & 6 with U1950 present, I have pulses on pins 7 and 3, but the board does not start, SMC bypass or not, just fan spinning 1 second, as before. Don't know where to go. It worked, I could boot in a SSD, but now dead again
I tied again together pins 5 & 6 with U1950 present, I have pulses on pins 7 and 3, but the board does not start, SMC bypass or not, just fan spinning 1 second, as before. Don't know where to go. It worked, I could boot in a SSD, but now dead again
I suspect something else corroded...