Please help me identifying this Chip M65RA L4915

[kct]

Please help me identifying this Chip M65RA L4916

I need some help, with identifying this Chip M65RA L4916 and finding a datasheet for it. This chip is used in a SONY MDR-NC22 noise cancellation headphone. The headphone still works but does not cancel noise anymore. I did make some measurement and suspect this chip to be bad.

Edit: typo corrected

 

[ahiukka]

Have you got the service manual, which includes schematics?
SONY MDR-NC22 VER.1.2 Service Manual download, schematics, eeprom, repair info for electronics experts

On that version of service manual the chip you are referring to would be LM4916?
http://www.ti.com/lit/ds/symlink/lm4916.pdf

Hope this helps.

 

[kct]

ahiukka,

Many BIG Thanks, this helps a lot.

 

[davidsrsb]

The first photo shows L4916, not L4915

 

[kct]

davidsrsb,

Thanks for pointing this out.

To me it looked like L4915. But now that I have the SM, I realize that it is in fact a L4916.

 

[kct]

Well, I ended up replacing the electret microphones and dialing the cancellation setting. Now it is much better than I remember it was.

 

[kct]

Added pictures