Tektronix Ths720A & power bank PW7015L & DC-DC Converter module

[PIC18F2550]

hello all

i need help for pinout conector jack of power bank "pw7015l" or dell addapter , i try for use my power bank dell for my osclloscope THS720A

i have power bank "pw7015l" 19volt 18000mah , and dc-dc converter for using to converte the 19volt to 12volt,  but the powerbank is not power ON becuse pin3 wire not connected

link for power bank
https://www.google.com/search?q=power+bank+pw7015l&tbm=isch&ved=2ahUKEwifm_fPzr7-AhWNvicCHf26Ac0Q2-cCegQIABAA&oq=power+bank+pw7015l&gs_lcp=CgNpbWcQAzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzIHCCMQ6gIQJzoECCMQJzoICAAQCBAeEBNQmr0GWP_oB2D17QdoAnAAeACAAYoBiAGDApIBAzAuMpgBAKABAaoBC2d3cy13aXotaW1nsAEKwAEB&sclient=img&ei=-GlEZJ-_JY39nsEP_fWG6Aw&bih=704&biw=1458&rlz=1C1NDCM_frDZ1024DZ1024

link for conector
https://www.google.com/search?q=dell+laptop+charger+pinout&tbm=isch&ved=2ahUKEwi8p-CVzL7-AhW2mycCHbmyBzkQ2-cCegQIABAA&oq=dell+charger+pinout&gs_lcp=CgNpbWcQARgBMgcIABCABBATMggIABAIEB4QEzIICAAQCBAeEBM6BAgjECc6BQgAEIAEOggIABCABBCxAzoECAAQHjoICAAQBRAeEBNQzhRYwXtg36oBaABwAHgAgAG4AogBlBaSAQgwLjE4LjEuMZgBAKABAaoBC2d3cy13aXotaW1nwAEB&sclient=img&ei=ZWdEZPzgLLa3nsEPueWeyAM&bih=704&biw=1458&rlz=1C1NDCM_frDZ1024DZ1024


link for dc-dc converter
https://www.ebay.com/itm/192208371512

thinkyou in advance for help and sory for my english