I would like to disassemble fisher price baby grand piano??

https://store.mattel.com/Results.aspx?Ntt=Step%20and%20play&tc=Products
You can try here

Baby grand pianos can range from Free to $1000 and $1000- $10000 depending upon make, model, and condition ? Would need more info to accurately quote a price ?

Is the battery installed backwards maybe??

try other batteries. check the metal ends where batteries connect
if corroded scrape with knife blade

Hey Jennifer,
Are you talking about the interactive toy?

Check here....
Amazon com Fisher Price Interactive Baby Grand Piano Toys Games
Fisher Price Laugh Learn Baby Grand Piano Walmart com
https://service.mattel.com/instruction_sheets/J9163pr-0920.pdf

Hi, we have exactly the same problem with our baby piano. The sun, hands and music note not moving or doing anything it suppose to do. Did you manage to get it fixed?

Hello, Bugsy243 -

First, did you replace the batteries in the Laugh & Learn Baby Grand Piano?

If you do not know how to do that, this is the link to the instructions (PDF document):
https://service.mattel.com/instruction_sheets/J9163pr-0920.pdf

You will need Adobe Reader software (free) for the PDF document. If you choose to save it after downloading, I suggest you save it to your Documents folder and give the file a name you can find later . . . something like: Fisher Price Baby Grand Piano. You can also print the instructions for easy reference.

The instructions for the toy state in the CARE section (page 2):
* This toy has no consumer serviceable parts. Do not take this toy apart.

Note: I do not find any other troubleshooting information (besides changing batteries) in the instructions.

Page 6 of the instructions provides the phone number for Fisher Price Consumer Relations:
800-432-5437
9 AM - 7 PM (Eastern Time), Monday - Friday
11 AM - 7 PM (Eastern Time), Saturday
Note: This is the telephone number for the USA. The bottom of Page 6 of the instructions gives numbers for other countries.

After changing the batteries, if the toy piano still does not operate properly, I suggest calling Fisher Price Consumer Relations to find out if there are tips for correcting the blue key and sun hands problems.

Note: If you find the toy piano still does not work properly and choose to purchase a replacement, please send the non-working toy to electronics recycling.

Best wishes.

I assume

No sound when baby steps on the keys (with high volume setting)
You have used alkaline batteries
You have tried replacing your betteries
Tried sliding the power and volume switch off and then back on

If you answer yes for all above then it is time to call Fisher price and ask for replacements.

if u remove the legs it will make the system board free , is not recommended but you can cut the legs and sand but you can never use it again sorry bay it help.

mcdevito75 here, Call or visit Fisher Price online is the best bet.