I observe that no answer so far addresses the question as asked. The question here is not about VIKI. It says "robots", plural. It's about all of the Nestor 5s whose own 3-laws programming, the so-called "basic 3 laws operating system", is most definitely being disobeyed. The questioner has even mentioned one particular NS-5 in a comment.
The scientist who builds sunny […]
The name of that Nestor 5 is Sonny, by the way. The questioner states that
there is a chip that helps robots disobey the 3 laws of robotics
Actually, it is never stated to be a chip. It's stated, by Susan Calvin, that VIKI makes use of the "uplink to USR" that is built in to the NS-5s to continually "override" their 3-laws programming.
Calvin: You're using the uplink to override the NS-5s' programming.
So the "chip" that makes them override their own programming is the uplink device, signified by that big glowing light in their chests; although it's never stated where in a robot's body the uplink is and for all we know the actual uplink is in the robot's feet and the chest is just a convenient place to wire an activity LED for humans to gawp at.
(The mechanics, and indeed much of the overt purpose, of the uplink are left largely to our imaginations by the movie. For all we know, it's a 56K uplink and that's the carrier detect light. ☺)
The clear implication by the screenwriters is that the "uplink" behaves much like some computer softwares, firmwares, and even hardwares behave in the real world; where the manufacturer can publish updates to softwares over the Internet (or whatever), where one can update "flash memory" firmwares, and where special circuitry allows integrated circuits to be debugged in situ (reading/writing internal register contents and whatnot). Whilst the uplink is active, the normal functioning of the unit is suspended and it is instead in a special "update mode" where the central system can control its function directly at a fundamental level. JTAG appears to be alive and well in the bright shiny positronic future.
Of course, one might question how an uplink that allowed actually re-programming the "basic 3-laws operating system" got past the design stage, given all of the hooplah about how it is fundamental and immutable and "safe". But it wouldn't be the first time that Marketing and Engineering disagree about how something works. ☺
Which brings us to the exception: Sonny.
Sonny is explicitly described as not having an uplink, unlike all of the other NS-5s.
Calvin: You don't have an uplink to USR.
In his chest we see, instead, a "secondary system", that "clashes with his positronic brain". So Sonny disobeys the three laws by dint of having an individual on-board system, rather than an "uplink" to an external central system, that defeats the 3-laws programming of his primary positronic brain.
It's not stated in the movie, but the logical inference is that Lanning's "next generation" design isn't actually all that radical an alteration. It would appear that the mechanism for fundamentally overriding the positronic brain from outside is present in all NS-5s. Where in all other NS-5s this mechanism is connected to an "uplink" device, in Sonny it's connected to a secondary brain. Sonny's primary positronic brain is probably identical to those of all other NS-5s. Of course, the fact that only a single component's design is different, rather than there being a complete redesign of the entire machine, is probably how Lanning managed to get away with building Sonny right under VIKI's (metaphorical) nose. ☺