I can,t receive any sound from my casio ctk 501
When wiring around circuit board cracks, one must use adequate sized wires and keep the leads short. Also you MAY have a microscopic crack in yet another conductor that flexes when you play the keyboard and freezes it. Use a high intensity LED light from the topside to "candle" the board and look for cracks. Look for cracking of the board material that may have tiny cracks in the circuit traces.
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Further, IF you disconnected any of the cables, some are VERY tricky to get reconnected. Some of the thin ribbons have little locks you have to release before re-inserting the cable. The lock then wedges the contacts together after cable is inserted.
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