K850: LCD display problem; picture atteched.
 

hi
i have K850 water damaged. phone working OK but there are some problems with mainboard.
i found one missed thing. i tried to make connection between that two solder points but after that step phone has got shortcirrcut and immediately power station display 0 volt of consumed power. i think it's not a fuse.

i attached picture so please advice me what part is missing there. maybe same parts are located at left connector which is near that one.

not good, i thought there was a capacitor because that fielsd looks like there was something soldered.
what should i check for not displaying LCD ?

i check all steps in 'display illumination problems" section of service manual. and here it's:
i don't have LCD backlights
i have 3.8V at MP 26 but when i press button to activate backlight i don't have 15V at mp 26 but i have 3,8V at MP 49 so i think i should replace V4200(manual steps)
questions:
1) i don't have new v4200 could you tell where i will find that v4200? which SE phones has got same v4200?

2) is it right thinking: v4200 operate only with backlight so i should see things on LCD but without backlight only, or when v4200 is damage i will not see anything like now?

v 4200 is also different , its true , its did not match with other models
Rashid Ahmed Nadeem