Hello,
I have two Intel DQ45CB Based PC's. One works, the other does not.
When power is first applied to the working one, it will immediately start up, and shut down again after about 5 seconds. Upon pressing the Power Button, normal boot up occurs.
When power is applied to the faulty one, you just get the Green Motherboard Power LED on. IF the power button is pressed, the CPU fan goes full speed, but there is no display output to the onboard DVI connector (or graphics card when fitted), there are no beeps.
I have removed the RAM, Graphics card, all front panel connectors, drives etc, changed the PSU, all with no change in behaviour.
I have replaced a capacitor which had shown signs of bulging (only one capacitor on the board is bulging) with no change.
I did try booting with the 4-Way CPU power plug removed, and then when powered up the CPU fan ran slower (don't know if that helps or not!.
All board fuses are OK.
The voltage across the replaced capacitor is about 1.1v (Capacitor rating is 6V3 1500uF)
I have checked the various larger transistors, and none seem short circuit.
I don't know the history of either PC, so cannot say what the trigger of the cause may have been on the faulty system.
This is the first motherboard I have attempted to repair.
I don't know where to start other than supply voltages on the board, so some tips would be great.
Any help gratefully received
I have two Intel DQ45CB Based PC's. One works, the other does not.
When power is first applied to the working one, it will immediately start up, and shut down again after about 5 seconds. Upon pressing the Power Button, normal boot up occurs.
When power is applied to the faulty one, you just get the Green Motherboard Power LED on. IF the power button is pressed, the CPU fan goes full speed, but there is no display output to the onboard DVI connector (or graphics card when fitted), there are no beeps.
I have removed the RAM, Graphics card, all front panel connectors, drives etc, changed the PSU, all with no change in behaviour.
I have replaced a capacitor which had shown signs of bulging (only one capacitor on the board is bulging) with no change.
I did try booting with the 4-Way CPU power plug removed, and then when powered up the CPU fan ran slower (don't know if that helps or not!.
All board fuses are OK.
The voltage across the replaced capacitor is about 1.1v (Capacitor rating is 6V3 1500uF)
I have checked the various larger transistors, and none seem short circuit.
I don't know the history of either PC, so cannot say what the trigger of the cause may have been on the faulty system.
This is the first motherboard I have attempted to repair.
I don't know where to start other than supply voltages on the board, so some tips would be great.
Any help gratefully received
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