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if you do repairs then disassemle the monitor.where the power cord is thats the power supply resolder the main components in the power supply. cause some of the them are not making good contact on the circuit due to the age of the monitor and constant heat over the years.
I received from iiyama a quote for repair: 400€ without VAT, 478 € with VAT, with a 3 month warranty.
So I ordered a HP LP2475W H-IPS LCD monotor from HP, for 656 € VAT & delivery incl. And a 3 year ON SITE warranty. It is superb, and after calibration it largely outperforms what I had before for my photographic use.
i think this problem accure due to chage of CRT CATHODE. if you are not a hardware engineer then check it from hardware engineer. any crt monotor have 3 RGB Cathode to release electron on screen. the electron comes shodow mask and create a pixel on the screen the pixel make a picture. The RGB color make the perfect picture. if your picture is dull then i think that happen due to less negative chage of Cathode or any Crt base Bios ic is failior. so you have to checked it from hardware engineer.