Hello,
I have a MSI MS-16JB1 board that has all the power sequence except VCC_GT. Impedance on VCC_GT it's 1.7 Ohm, i have PWM from the ISL going to the smart FET's that control VCC_GT, FCCM_B it's kept low as opposed to the FCCM_A for the VCC_core smart FET's that it's high. NO shorts and no other anomalies except no BL_ON because no EDP_BKLTEN that comes from PCH and goes to an AND gate ( NC7S08 ). The AND gate receives the other signals. This EDP_BKLTEN could be because no VCC_GT i presume, but no VCC_GT because of EDP_BKLTEN, i doubt. Also no display on HDMI or laptop screen. I also checkd with a flashlight if there is something displayed but nothing. Discrete Nvidia GPU has power 0.8v and all the rest of the peripherals. If i plug a usb keyboard no CapsLock or NumLock lights but 5V present at USB ports.
The board starts and stays on, fan spin after 10 seconds when the CPU gets warm. BIOS reprogrammed and looks fine.
I do not have a schematic for this one and i am using as a reference the MS-16J51 one.
If anybody has some ideas they would be greatly appreciated.
Thank you!
I have a MSI MS-16JB1 board that has all the power sequence except VCC_GT. Impedance on VCC_GT it's 1.7 Ohm, i have PWM from the ISL going to the smart FET's that control VCC_GT, FCCM_B it's kept low as opposed to the FCCM_A for the VCC_core smart FET's that it's high. NO shorts and no other anomalies except no BL_ON because no EDP_BKLTEN that comes from PCH and goes to an AND gate ( NC7S08 ). The AND gate receives the other signals. This EDP_BKLTEN could be because no VCC_GT i presume, but no VCC_GT because of EDP_BKLTEN, i doubt. Also no display on HDMI or laptop screen. I also checkd with a flashlight if there is something displayed but nothing. Discrete Nvidia GPU has power 0.8v and all the rest of the peripherals. If i plug a usb keyboard no CapsLock or NumLock lights but 5V present at USB ports.
The board starts and stays on, fan spin after 10 seconds when the CPU gets warm. BIOS reprogrammed and looks fine.
I do not have a schematic for this one and i am using as a reference the MS-16J51 one.
If anybody has some ideas they would be greatly appreciated.
Thank you!
. Rechecked all voltages and signals. all it's there apparently, but one thing caught my attention. Pin 1 on BIOS chip ( CS, chip select ) instead of going low as stated in the datasheet it stays high. CS should be driven low by the EC chip on pin 128. I replaced the EC chip from a similar board and no change, still stays high. Any suggestions here? Indeed not posting....
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