Help:Jtag configuration of Cyclone2

[Altera_Forum]

When the Cyc chip was welded on my PCB. All the bins are normal . 

I load an easy design via jtag to control LED to on and off. But It doesn't work. The programmer shows me 100% and successful. The voltage of the LED pin is 2.78V and the LED is on, funny indeed , the I/O port next to the LED-drived I/O port become 2.78V too. When power down, the two ports are not connected , but why the Voltage became same when power on? I am puzzled. Do you face this problem either?

[Altera_Forum]

I assume you are assigning the pins to the right locations. 

 I also assume that the design is looking to pull the I/O low to sink the LED Cathode current.  These are the two I can think of based on the limited info provided.

[Altera_Forum]

Surely I assigned the pins to the right locations and the design is looking to pull the I/O low to sink the LED Cathode current. 

The funny thing is that when I tried again last night after I left my pcb alone for a whole day yesterday , It works. I don't know what is wrong with it and what's the problem with the PCB or FPGA. I am really pullzed, Avatar.