I did disassemble my LG screen and fount on t-con pcb this. Why enginer cut this island on the pcb?
UPDATE: I did add other side and general view. T-com it is a timing controller in lcd display. It is a pcb between main pcb and lcd panel. I see such solution first time in my life and I'm intersting is there any notes about it in literature?
Also, seems the wire on entering and exiting the island is the same.
There could be multiple reasons, but it would be way more clear if you showed us the backside of the PCB, too.
Here are my two top-of-my-mind guesses:
1) Additional Trace Inductance
The designer wanted to increase the inductance between two different parts of the circuit. By cutting these slots in the PCB, the currents have to go a longer way which means increased inductance.
2) Strain Relief
Because multiplayer capacitors are very sensitive to bending the PCB, the desiger wanted to relief the strain from these capacitors.
I will go out on a limb here and say that it is designed like that so that the entire peninsula and its associated components can be snapped off and removed from the circuit without tools.
Given that the PCB traces continue outside the island, the cutout can’t be for voltage isolation. While it could be a snap-off there’s no indication of a point where that would happen, so microphonic isolation would seem to be the most likely reason. That said, it would be impossible to know with certainty without a statement from the designer(s) of the board.
