Honda CRF150L speedometer is notorious for Fuel meter error and or blackout non functional display error due to the design with its two rubber switches on top of the panel. Many digital speedometer has it like Honda Click 125/150 scooter which is common of having a blue screen issue. Just like any speedometer. When there is a rubber cover on the menu and or setup button, rest assure water can penetrate inside.
Picture on the top show those two button on the left most and right most part of the speedometer. That is where the water gets inside.
Open the unit will show you this kind of visual representation of what water when dried will looks like. Those white marks shows that it already on the CORROSIVE PROCESS.
Keep on looking for water marks and clean it thoroughly with a 99% iso alcohol, It is the best cleaning solution for all electronic boards to remove those water marks completely since the alcohol evaporates quickly and no water content like the 70% alcohol.
When cleaned look for components like SMD resistor and Capacitors that looks eaten away by the corrosion by water everywhere. They are most likely the culprit. If have a soldering skill then that is the most important thing you will do for once a component is being heated and cannot be soldered due to oxidation. That part has already no connection on the board.
The VIAS also (those holes that connect the front and backside traces of the board is also a CULPRIT of the no connection.
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