Hey guys. I got a dead LG 27GL650F-B monitor (no power). So i readed this thread and checked the IC401 voltages. On the pin3 missing 1,2V and pin6 missing 1,8V. In my country only availabe the MP2122AGJ component. Succesfully changed the IC401 and the monitor started working. WOW! Thank you guys for the information. Great community.