May i know, is it a crt monitor or lcd monitor? If it is a crt monitor, then you can try to check the dry joint on te pcb board especially primary and secondary power supply. After that check the FBT with blue ring tester & cap meter to check their HV cap value.
If it is a LCD Monitor, please check on inverter board and the ccfl lamp too. Please check all the electrolytic cap on lcd monitor pcb board for low esr ohm with blue esr meter. Below is some usefull link for repair lcd monitor and crt monitor:
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I think I have the solution for this. I just purchased a monitor and it immediately began to flicker and then blank the screen. I pulled it apart, but to no avail. The problem is caused by the computer powering down the monitor, for example a laptop will power down the monitor to save battery life. It is the awakening of the monitor that causes the flickering. Obviously there is a software bug in the firmware that will not allow it to synch properly. The fix is pretty obvious, just stop the computer from powering down the monitor. You can still blank the screen using a screen saver, which is what I have done, but you are not getting the full power saving. I hope this helps someone else - it drove me crazy for a day or so.
Hi , The monitor flicker problem. The monitor when turn on will display image for couple of second then turn black. The monitor status led is still green. This will happen each time it is turn on. The symptom at appear to come from the inverter board.
FIXED! Device : Spectra X20WG-Naga Problem : monitor comes on then flickers then goes off solution: Replace Capacitor C101 (150uf, 35V) and Fets U101 and U102 (4511GM) Comments: This is a common problem with this monitor.