First it started to flicker, now it will turns off

I have the same issue. First it started to flicker, now it will turns off and i have to unplug and plug back in to get it to work. Sometimes it will dim. I also noticed if it dims by it self then it will not turn off over time like it would with a full brightness.

I am pretty handy and can replace anything so I just need to know what to replace.

1. Power board

2. Logic board

3. All-in-One cable

Any suggestions?

Update (06/21/2016)

UPDATE: REPLACED AL IN ONE cable and PSU board and it din't help.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0