I would open it up and inspect the capacitors in the power supply section first since it is simple thing to do, look for bad caps with bulging top or seal, see failed monitors (common problem) due to bad caps:
http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.
The filter caps may be still function but not completely, there will be high frequency AC ripple riding on top of the DC voltage and can give a lot of strange symptoms. When the caps finally give up then you will have AC feeding the circuits which will end up damaging the components. You can have th repair shop replace the whole set of the caps in the secodary DC rectifier circuits or you can donate it to someone who is learning about repairing electronics.
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Sometime it was caused by ac adapter, but if the power is build in, means no need the ac adapter then it probably either power board or inverter with back light tube defective. you can contact with the manufacturer for warranty repair if it still under warranty service.
SOURCE: Philips 170V LCD screen steadily blinks on and off, even when not
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
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Ugh, I took it apart as instructed, and indeed at least 4 of the capacitors (the brown ones) have very slightly bulging tops (very slightly, almost not noticable, but they are definitely not 'flat'). What do I do now? Get a new monitor?
Also, if it is the capacitors, why does it eventually start working on its own? Will it eventually just die altogether?
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