What kind of chip is used in my circuit board?

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theateist

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I have a toy car with buttons that produces sounds and music. It stopped working and I decided to try fixing it. There is a board with a chip. I used a multimeter to test voltage where the load speaker is connected when any button is pressed. It was always zero. I checked the load speaker and it works. I checked the inputs to the chip and they are good - I can see voltage changes when a button is pressed. So, my conclusion is that the chip is dead. Can you help me to figure out what kind of chip is this? Below are the images of the board:
 

Hi,

the chip is covered by the black blob (epoxy) to protect the chip as it is a chip on board solution (COB). Here the chip is not housed in a package, instead the silicon is directly bonded to the PCB. Even if you get rid of the epoxy you would not be able to identify the chip as there is no part number on it, its only the silicon.

BR
 

If you removed the glob you might find a part
number (more common on older parts, later
the companies drifted toward only a mask
series number and maybe their logo, which
could still lead to a P/N if you dug deeper or
had connections inside the mfr to cross-
reference "TA56789" to "Phillips NE555"
or whatever).

If it was a custom chip then you may be
further out of luck, less info (if any) available
due to proprietary blah blah blah.

I'm guessing that with the evident low quality
of the assembly, that this is a low cost
commercial die (because a plastic package
added 3 cents to BOM cost, over in-house
wire bond and glop).
 

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