EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: tombi on January 25, 2018, 03:12:13 am
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Hello,
Trying to fix this AIS receiver for a friend.
Powers up on 12V but not on USB.
The thing has a million PTCs on it. I figure out the upper one (marked C) goes open circuit when I power it up off USB.
I think the chip marked ZE below is a DC-DC converter. it is just above the microcontroller.
For the life of me I can't identify the damn thing from the marking codes. I've tried the marking code books, lots of google searches etc. I think the sideways 27t is some sort of batch/voltage marking code and it might be on-semi but I have no idea.
I know people probably hate these posts and someone will find it on their first google search but I am stuffed if I can.
Tom