Blue keys on fiher price grand piano do not work

It sounds like there may be an issue with your Williams M Grand digital piano. The fact that the display is not working and the piano is making a buzzing sound suggests that there may be a problem with the internal electronics.
Here are a few things you can try:

1. Check the power supply: Make sure that the power supply is working properly and that the piano is receiving power. Check the power cord, ensure that it's properly plugged in and that the outlet is working.
2. Check the connections: Make sure that all of the connections between the piano and the power supply are secure and that there is no damage to the cables.
3. Try a factory reset: Consult the piano's manual for instructions on how to perform a factory reset. This can sometimes fix issues with the internal electronics.
4. Check the manual: Consult the piano's manual for troubleshooting steps, it may have some information that can help you.

If none of these steps work, it is likely that there is an issue with the internal electronics and the piano will need to be repaired by a professional technician.
Keep in mind that attempting to repair a digital piano can be dangerous if you're not familiar with the proper procedures and safety precautions. It's best to let a professional technician handle the repair.
It is recommended to contact the manufacturer's customer service or a professional technician to have the piano inspected and repaired.
Regenerate response

Sounds like the power supply needs repair. Often the capacitors are leaking (electronically) and they cause the equipment to not work properly.

Jacob Brothers from 1921 according to the link shown:


https://www.mypianofriends.com/i-have-a-jacob-brothers-piano-model-number-57866-but-i-cant-find-any-infor...-107545.html

Quoting:

I have a Jacob Brothers piano model number 57866 but I can't find any infor... by Guest 5 days ago
9
I have a Jacob Brothers piano model number 57866 but I can't find any infor... I have a Jacob Brothers piano model number 57866 but I can't find any information on it? Anyone know anything regarding this model?
Posted on Questions & Answers
Answer
4 days ago C. Anthony
Guru
Blogs: 48
Forum: 16,526
Votes: 420 What type of information do you want? you have the piano in front of you!
specifically what do you want to know?
the SN shows 1921 date.
Have you tuned it this year? If the piano will not hold tune to A=440hz, the value would be 0. However, I would think it would hold 440...but I may not.
Call your local piano technician to check it fully.
CAPReply

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Inside the piano

Unplug and leave it unplugged for a while and then make sure the plug is nice and secure on both ends and try again

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.