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 - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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