This is a part I've asked about before, but got the number wrong - having found another and used a better magnifier I found that I'd mistook an E for a 1
The first chip was found on a Toshiba laptop display panel
/\\540 575E
The second was found on a Toshiba laptop audio board
/\\524 575C
Both devices are 4 pin and about 4.54 x 3.11mm.
TIA.