As far as troubleshooting a circuit board, without a schematic and knowing how to read it, about all you can do us look for the obvious.
Look it over for heat discolored components. Slightly discolored resistors don't count, but charred is not good. Look for swollen capacitors. Anything that doesn't look normal.
But one of the most common failures is broken solder connections. They usually happen around areas that are physically stressed, like terminal strips, any large components, but can happen anywhere.
Look the board over, try to find where the circuit in question connects. Start there and look for a cracked ring around where any related components are soldered to the back side of the board. A jewelers loupe or good magnifying glass helps. Also if you can connect an ohm meter to the circuit and gently move the components around, look for a loss of connection.
Sometimes just going through the motions of removing, cleaning any edge connectors, plugs, wire terminal connections, and reinstalling will make one work.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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