Board Number : LA 7912P ( REV 1.0)
Condition in which we received this board : The board originally came to us as not turning on. No lights , no fan spins.
Current Issue: We found that +VSBP was not generating due to faulty P channel mosfet, we replaced it and now +VSBP is generating fine. But we have a different issue now. If I press the power button the fan spins and power led glows for few seconds then stops. I measured and found that we have required voltages on all the coils except the GFX coil. We even have PLT reset and LID switch has 3.3 volt. The amp goes .400 Amps and then drops to .006 . I have flashed the MAIN AND EC bios. I haven't reprogrammed the KBC so far. Any pointers will be appreciated.
Attaching schematic for a quick look.
Condition in which we received this board : The board originally came to us as not turning on. No lights , no fan spins.
Current Issue: We found that +VSBP was not generating due to faulty P channel mosfet, we replaced it and now +VSBP is generating fine. But we have a different issue now. If I press the power button the fan spins and power led glows for few seconds then stops. I measured and found that we have required voltages on all the coils except the GFX coil. We even have PLT reset and LID switch has 3.3 volt. The amp goes .400 Amps and then drops to .006 . I have flashed the MAIN AND EC bios. I haven't reprogrammed the KBC so far. Any pointers will be appreciated.
Attaching schematic for a quick look.
Comment