One bad " solder " joint . ( spot weld )
It will take forever to fix it. I had an Akai vcr with crook solder joints . After the third atempt the warranty would not cover it again .
I had to fight tooth & nail to get a replacement, & only after agreeing for the dud to be returned to maker .
spacesailor
PS. : was given a dead Battery pack .opened it up & two weld tabs were not done .it should have been returned, but too much hassle, so I chopped it up to resize for my use .