HELLO, and thanks for the add to the community.
I have a harbor freight jump box that is kept plugged in to assure it's charged when needed.
a while back one of my cats managed to unplug it and I took the back off and verified it was still charging and it charged back up just fine.
Fast forward to yesterday and even though the jump box was plugged in, it was not charged enough to work.
I thought maybe it had been knocked loose so I put t on the counter plugged in, and grabbed another one I had found while cleaning out my parents house [had to replace it's battery since it sat unplugged so long]
when I came home the box was still dead, so apart it came, with the battery only reading 5V.
I pulled it out and then grabbed the meter and verified it was NOT charging to the output wiring to the battery.
traced the power supplies wiring to the tiny circuit board and it is putting out 17V and there is a small relay [blue] that "clicks" when the wall plug is attached.
however there is no 12V output .
attached is a pic of the small circuit board, there does not appear to be any damaged components so I was wondering if anyone was familiar with this style of circuit and could offer insight as to which component might have gone bad, as I really hate to just throw it away
thanks for any advice
doug
I have a harbor freight jump box that is kept plugged in to assure it's charged when needed.
a while back one of my cats managed to unplug it and I took the back off and verified it was still charging and it charged back up just fine.
Fast forward to yesterday and even though the jump box was plugged in, it was not charged enough to work.
I thought maybe it had been knocked loose so I put t on the counter plugged in, and grabbed another one I had found while cleaning out my parents house [had to replace it's battery since it sat unplugged so long]
when I came home the box was still dead, so apart it came, with the battery only reading 5V.
I pulled it out and then grabbed the meter and verified it was NOT charging to the output wiring to the battery.
traced the power supplies wiring to the tiny circuit board and it is putting out 17V and there is a small relay [blue] that "clicks" when the wall plug is attached.
however there is no 12V output .
attached is a pic of the small circuit board, there does not appear to be any damaged components so I was wondering if anyone was familiar with this style of circuit and could offer insight as to which component might have gone bad, as I really hate to just throw it away
thanks for any advice
doug
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