HP Pro 3420 Maintenance & Service Manual page 80

Converter board jumper settings
Position the jumper on the converter board based on the display panel installed. Place the jumper on
the header on the converter board as follows:
●
Samsung panel:
◦
CJP2: pin 6
◦
CJP1: pin 1
●
LG panel:
◦
CJP2: pin 5
◦
CJP1: pin 2
CAUTION:
72 Chapter 7 Removal and Replacement Procedures All-in One (AIO) Chassis
Incorrect jumper placement can result in damage to the converter board.