JTAG/UART/SPI/Diagnostic I/O used in Sony repair centers if a PSVita couldn't be fixed by software.

Pictures

<imgur>cWujmwt.png</imgur>

Pinout

Pin	Name	Description
1	GND
2		Connected to JL Pin (Bottom left 1st)
3	GND
4		Connected to JL Pin (Top left 1st)
5	GND
6		Connected to JL Pin (Bottom left 2nd)
7		Connected to JL Pin (Top left 2nd)
8		Connected to JL Pin (Top left 3rd)
9	GND
10	GND
11
12
13		Connected to JL Pin (Bottom left 3rd)
14
15	GND
16	GND
17
18
19
20		Connected to JL Pin
21	GND
22	GND
23	VDD
24	VDD