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Louie
Louie, Technician
Category: Electronic Musical Instruments
Satisfied Customers: 11433
Experience:  25+ yrs. experience in the field and 5+ yrs. online, down to component level.
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My Casio LK-43 keys light up but no sound comes out.

Customer Question

My Casio LK-43 keys light up but no sound comes out.
Submitted: 1 year ago.
Category: Electronic Musical Instruments
Expert:  Louie replied 1 year ago.

Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, proposed preliminary checks (if have not been tried):

  • • plug in a pair of headphones at the rear's PHONE/OUTPUT jack;
  • • or with a suitable cable to an amplifier.

Still, the described symptom almost always point to an internal hardware issue or more particularly, possible suspects are:

  • • faulty speakers (least likely);
  • • failed onboard amp circuit (likely);
  • • low or missing secondary voltages internally from the external 9V supply (most likely).

All of the above would require that the unit be opened up for visual inspection, voltage/continuity/resistance checks, confirm faults and effect repairs.

I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.

Please post back how you would want to approach this and/or should additional information be needed.

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