Thanks for the reply, buddy. Got some clue from IRC, "check jumper under Z stepper driver. should be 3, and check that all have metal in them (Ive seen empty jumpers before), also check soldering of jumper pins " therefore, I tested with another spare ramps. And it is working fine now. though the other ramps has some issue with the end stop pins. Terrible builds, hope it helps the others.
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