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2-5 minutes , it will not overheat
the power supply is defective
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there may be some bad capacitors in the primary of the power supply. do you get any led lights the front? most polaroids will have a red led on the front if the standby supply is good. there will most likely be some smaller caps 47mf@50v 10mf@50v probably that value that are bad.
if ur machine is lockstitch try to use new bobin case or readjust the screw for spring. normally we change bobin case with new one also try to send ur machine model to any one can help u on site
ashraf abozid email@example.com
its a pretty complicated process to take off the front panel, you will need special tools for this problem, i would bring it to a professional, the easist way is to lay it on the back side and go from there, if not like stated above bring it to a pro.
ps:drain lines hardly go bad on LG's hmm,if it's leaking then it might be the internal supply lines on the top.