The motherboard came dead...without ite and bios chip...but i tried to repair it...i soldered a new it8585e chip and bios chip. I programmed bios using some dump i found.
As i can see the motherboard have all voltages present except when i turn it on the susb_ec# is low, 2.4 vol. maybe thats why it is not starting?
If i use keyboard connector and press power (the power key is on keyboard) nothing hapends...if i gently touch one of the joints (with metal pencil) on +3vsus_pwrgd net the board will automatic start...i check all the voltages and all seems fine except susb_ec# which is 2.4v.
Before powering i have voltages on:
ac_but_sys, +3va,+5va,+3va_Ec,pwr_sw, susb ec#.....If anything more needed please ask?
After powering i have:
pm_susb# 3,2 v, pm susc# 3,2v, susc_ec 3,2v, susb_ec 2,4v...if anything more need to check please ask?
so two questions...why the motherboard is not powering up using power button on keyboard, and can you help me to find what is wrong with susb_ec 2.4v? thank you!
The boardview attached.
As i can see the motherboard have all voltages present except when i turn it on the susb_ec# is low, 2.4 vol. maybe thats why it is not starting?
If i use keyboard connector and press power (the power key is on keyboard) nothing hapends...if i gently touch one of the joints (with metal pencil) on +3vsus_pwrgd net the board will automatic start...i check all the voltages and all seems fine except susb_ec# which is 2.4v.
Before powering i have voltages on:
ac_but_sys, +3va,+5va,+3va_Ec,pwr_sw, susb ec#.....If anything more needed please ask?
After powering i have:
pm_susb# 3,2 v, pm susc# 3,2v, susc_ec 3,2v, susb_ec 2,4v...if anything more need to check please ask?
so two questions...why the motherboard is not powering up using power button on keyboard, and can you help me to find what is wrong with susb_ec 2.4v? thank you!
The boardview attached.