wei-ya 829HR can't link monitor?what i miss

[acidrock]

i have 2 monitor use wei-ya  15 k chassis when i split jamma to connect chasis board
open first monitor picture is ok then i off first monitor and open Second monitor with link cable rgb picture it ok
but when i open Together chasis is spark and Fuse blow i don't know how to i miss

i connect chasis board to step down transformer from 220 to 110 
my home don't have ground earth
my chasis don't connect noise filter and isolation transformer  only AC -->step down transformer from 220 to 110 >>>>>>chasis

what  important for split monitor i need to know and thank you for help me and sorry my English very low skill

[grantspain]

each monitor needs an isolation transformer

if you had an earth and consumer unit then the trip would have blown instead of the fuse