We have a Lowrance Hook 9 TS on the bench with an intermittent power issue. By far the most frustrating type of repairs. We solved any existing problems (and future ones!) by performing extensive preventive maintenance on the motherboard and connector pins.
To assist the customer in troubleshooting his side, we made a custom power cable tester. If anyone would be interested in a power cable tester, just let me know and I will build a batch (...not using a highlighter cap as the case though.... ;) ).
For all electronic repairs go to:
www.rudolphrepairs.com