I bough DQ77MK Main Board for Industrial Work Station.
when i turn on, the front power LED was not on.
LED was connected to alternate front panel power/sleep LED header.
I already try to change the direction + and -, but still not work.
When i check the voltage level for LED header, the value is 1.8 VDC.
which component has wrong? is it on LED or Mainboard?
could you please advice to me how to do?
Please refer to section 18.104.22.168 on page 60, table 30, pin 2 and pin 4 for the front panel POWER LED, and section 22.214.171.124.3.
For the alternate front panel power LED, refer to section 126.96.36.199.5.
For the location ot the front panel header, refer to section 2.2.2, page 51, figure 11, location R, and location Q for the alternate.
1.8v sounds correct for the LED voltage. If your current LED does not work when correctly connected to the primary or alternater header, I would try another LED.