The motherboard does not turn on.
I use a wall power meter to check the power consumption.
I plug dc jack without battery, 0.9W, white led turns on.
Push power button, drop to 0.6W, pu3 wakes and it outputs +5vs5 and +3vs5 and it's LDO are ok. Also i stress test the +5vs5 and +3vs5 lines and they withstand many amperes.
PU3 replaced, same results.
HWPG is pulled down from something, i checked all IC that connect with HWPG and they act normally. One by one i injected them their EN signal and they output power.
I tried to inject 3.3v at HWPG line and it keeps low, it resists at 600ma. (also the machine does not wake after this, no fan)
I don't know if some ic pulls HWPG low for a correct reason, i cant think why because they all work good if they receive EN.
I dont have MAINON and SUSON, when i inject 3.3v at them, most of power IC outputs power but no fan spin and the total consumption is around 2-3w so CPU did not wake.
U5 sees low HWPG, so it logical not to output MAINON and SUSON.
Without cpu it have the same results. Without RAM the same results. Motherboard is naked, no wifi card, no disk, nothing connected.
I'm out of ideas, can anyone suggest something?
Thank you.
I use a wall power meter to check the power consumption.
I plug dc jack without battery, 0.9W, white led turns on.
Push power button, drop to 0.6W, pu3 wakes and it outputs +5vs5 and +3vs5 and it's LDO are ok. Also i stress test the +5vs5 and +3vs5 lines and they withstand many amperes.
PU3 replaced, same results.
HWPG is pulled down from something, i checked all IC that connect with HWPG and they act normally. One by one i injected them their EN signal and they output power.
I tried to inject 3.3v at HWPG line and it keeps low, it resists at 600ma. (also the machine does not wake after this, no fan)
I don't know if some ic pulls HWPG low for a correct reason, i cant think why because they all work good if they receive EN.
I dont have MAINON and SUSON, when i inject 3.3v at them, most of power IC outputs power but no fan spin and the total consumption is around 2-3w so CPU did not wake.
U5 sees low HWPG, so it logical not to output MAINON and SUSON.
Without cpu it have the same results. Without RAM the same results. Motherboard is naked, no wifi card, no disk, nothing connected.
I'm out of ideas, can anyone suggest something?
Thank you.
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