Heating bed over heats

[runaway380]

When I power my i3 B the bed starts heating until it reaches 120°c i power down i tried changing the temperature from the firmware and slicer nothing seems to work
BW : ramps_for_i3 installed heated bed on : D8
Please advise me

[zhangxueyou]

Could you tell me if the temperature raises as you turn on your printer?

[runaway380]

Yes that's exactly what's happening to the bed as soon i turn up the printer

[zhangxueyou]

Please check if this parts, which are highlighted in the pictures, are short.
And confirm your hotted is connected to "+" and "-" of D8.

QQ图片20150327101554.jpg (44.19 KiB) Viewed 12821 times

QQ图片20150327101549.jpg (62.67 KiB) Viewed 12821 times

QQ图片20150327101541.jpg (45.88 KiB) Viewed 12821 times

QQ图片20150327101526.jpg (85.47 KiB) Viewed 12821 times

[runaway380]

Are they short in size or are they touching each other (shorted circuit )
And yes the hot end connected to D8+ & -

[zhangxueyou]

Yes, I mean whether they touch each other.

[runaway380]

Non of them are in touch with each other

[zhangxueyou]

Please try to re-burn the firmware.

[runaway380]

I tried that more than five times nothing seems to stop the bed from heating rapidly

[runaway380]

Thanks for your help