Help! trying to fix a mechanical keyboard (redragon fizz k617)

[nibalam]

Hello there, first post here!

Last week a friend of mine brought me a Redragon fizz k617, with a problem of a vertical row not working entirely, he told me that the keyboard was working fine, his home lost electricity for a few minutes, after electricity came back, the keyboard row of 2-Z-S-X-LALT stopped working!

I opened the keyboard as you can see in the photos below trying for find a way for bridging, I couldn't I think since that row has stopped (or my lack of electronics ofc);

So any help! & thanks!

[cybership]

same problem as my this same keyboard and problem is with keys including space,b,g,t,5 one row do you know how to solve this occurred 1 week ago and i cant use this keyboard anymore for gaming because space bar is not working also i cant use it for typing i guess i have to throw away this keyboard now and this happened after 10 of warranty expired so cant sent it to service canter either   

[zegonix]

can you post a close up of the mcu (square black component under the spacebar with (probably) 64 pins)?

also do you have a multimeter and soldering equipment?

[cybership]

can you post a close up of the mcu (square black component under the spacebar with (probably) 64 pins)?

also do you have a multimeter and soldering equipment?

help me i have solder and multimeter
the problem is entire row not working, i checked all the connections and found that one common connection for this particular row consisting space , b , g , t , 5 is not registering input when i short them or not i can use jump wire to bypass common connection or ground connection

here is all 3 image one is micro controller other 2 is pcb
i dont know how to post image here so i uploaded on imgur website
here is it https://imgur.com/a/3Rrpj0a

[zegonix]

i checked all the connections and found that one common connection for this particular row consisting space , b , g , t , 5 is not registering input when i short them or not i can use jump wire to bypass common connection or ground connection

i don't understand what you are trying to express here.

in the last picture on imgur i see, that the left switchleg (the ones closer to the micro controller), of the column in question, are connected. follow that trace to the micro controller to see, which pin it is connected to. then measure the resistance between that pin and the (left) switchleg of any switch in the broken column. if it is more than 5-10 ohms that is most probably you problem.

[Keycap]

Definitely seems like something shorting out, maybe a bad connection to the microcontroller or something on the other side of the PCB. May require more disassembling if everything on the microcontroller looks fine (given it wasnt fried by a power surge..)
Highly doubt it would be anything related to diodes.

[cybership]

Definitely seems like something shorting out, maybe a bad connection to the microcontroller or something on the other side of the PCB. May require more disassembling if everything on the microcontroller looks fine (given it wasnt fried by a power surge..)
Highly doubt it would be anything related to diodes.

tested all diodes and resistors also that ground connection of key (5, t, g, b, space) trace back to micro controller is also completely fine i doubt must be faulty micro controller , i checked back of the pcb but there is no component only leds 

important - when i connect ground of (5, t, g, b, space) with ground of (4, r, f, v, ) 5,t,g,b,space key works for 2 - 10 minutes then it again not working