If your keyboard has been affected by a lightning strike then every semicondutor ( diode transistor i/c ) will be blown ...I know most components are on the mother board but not all ...I reckon cheaper to buy a new one ...sorry
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Can you activate various other controls?? If so, it sounds like your output amp section might be at fault....Does it have a headphone jack?? If so do it work?? And would really need the exact model number......
It looks like the Korg c-15s has a internally mounted speaker and so I will assume that the speaker and amplifier are part of the piano base. It sounds like either the speaker is blown (crackling sounds heard as deformed voice coil scrapes the magnet structure) or the audio amplifier is distorting the audio.
Connect the piano's output to an external amplifier and speaker to properly identify problem.
I have a Korg C-15s and also experiencing loud crackling sounds when I turn it on. The problems seems to be either the sliding volume control or the amplifier itself. Honestly though, I believe the issue is the volume control. I opened my piano to get a closer look and attempted to clean the contacts on the volume. Unfortunately after cleaning the contacts, the crackling sounds became somewhat worse. After I turn the piano on, the volume control is generally rendered useless......volume set to low volume and the noise is quite loud and other times the volume control is set high and get very low volume crackling noise. No real consistency. The noise does diminish after a few minutes but so does the piano sounds to an inaudible level. There were a couple of instances where I turned it on and surprising enough, no no noise and perfect sound. For these reasons I believe the issue is within the volume control and not so much the amplifier. I have an electronics background and noticed that the volume control is very unique in design and is not something that can be substituted with another volume control from other sources.
My recommendation is to check the sound quality of the audio from the RCA L/R audio outs on rear of the piano by connecting to a stereo receiver. If it sounds fine you're in luck. If the crackling sound does not diminish after a few minutes like mine does, I would suggest disconnecting the internal speakers and using the audio out only. You can connect a pair of studio monitors or high quality computer speakers, preferably with a small subwoofer to deliver the full audio range and deeper tone of a real piano. I'm currently using a basic pair of Logitech computer speakers and is quite acceptable until I can afford a high quality set of monitors or relocate my piano closer to my high quality Yamaha receiver.
The Korg SV188 has stunning realism in the Grand Piano arena. It uses a 12AX7 tube in the preamp output for that classic analog warmth lacking in so many garden market digital stage pianos these days. It has weighted hammer action and carries a price tag of $1,699.00 at American Musical Supply.com They even throw in a extra years coverage at no cost. The Yamaha MOXF6 88 key (same price) is another fine grand piano that wont disappointed but be prepared for a large learning curve learning all the rest of it functions, there are plenty to chose from. Roland wins hands down with its RD300nx, $1,799.00 and the RD700NX $2,699.00 simply the best digital stage pianos money can buy . Look up the specs at AMS
You will likely have to double that budget to get anything decent... but look for a Yamaha in the PSR series (61 keys minimum). To get a full 88 key, you might have to be up in the $400 range for anything really decent.