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 - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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