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It can be due to bad poweer supply caused by bad DC filter caps, bad backlights inverter circuits, bad lamps assembly. It will require in-depth trobleshooting. http://s807.photobucket.com/albums/yy352/budm/SONY/ If you are going to DIY repair, please read below first.
Basic LCD monitor and LCD TV troubleshooting guide:
I have the same issue and wrote the monitor off for now after checking all cables (and a different computer). The logic circuitry and panel are sill ok as I can see a faint image with proper lighting and close inspection, but no backlight makes it useless.
Since there are 4 lamps (CCFLs) on this model, the problem likely is not there but on the inverter circuitry driving them. This does not look easy to replace as this is part of a bigger board.
It looks like some could repair by changing a few (or even one) component on the board, but unless your are used to this (de-soldering and soldering back), you are kind of stuck.
I will attempt this if I have time as I hate junking 99.9% ok hardware. In your case since this is an old monitor you should just replace it if not technically (on the electronics side) apt.
h_e_l_l_f_i_, Have you performed the flashlight test after the screen goes "BLANK" ?? No!! You will not find the "flashlight" test listed in the OWNERS manual!! The test is a quick evaluation of the STATE of the units "switch-mode-power-supply". Did you repair the power supply to get online to fixya? The more info you tell me about your LCD monitor the better I can assist you. Is the unit really "BLANK" or is it just "BLACK"?? Can you SEE the WIN-desktop when a bright "flashlight" is held 1" from the screen at different angles? If you can see a faint image being displayed it means the SMPS is in partial shutdown and still powering the VGA to LCD interface board. If unit is both BLACK and BLANK, then SMPS is likely in full shutdown mode! I will assume that when you stated "runs" for 5 minutes, that it would display normal text and graphics as usual and NOT be wearing a pair of NIKE's runners footwear? Yes! From your description it would lead me to think that your SONY has a SMPS/INVERTER problem. You failed to state the age and or approximate TOTAL "ON" hours the unit has. (hrs/day x 350days x Years since DOM). It makes a difference in whether I tell you to trade up to a wide screen or have it repaired(refurbished with new SMPS/INVERTER or just rehab the SMPS on your own. hellfi, surely, after reading this you WILL go to YOUTUBE, (just fyi) and view some of the longer video clips of "LCD monitor disassembly" and typical "LCD monitor repair"!! You WILL be impressed at how much you will learn about how "the black screen of death" is dealt with. If this response helps in any way, please rate it on fixya. 12fixlouie lmistyrel @ aim.com Get back to me if further assistance is required asap!!!
When the screen turns black again take a flashlight and shine it in the bottom left hand corner where the Windows Start button is located. If you can see a faint image then your back light is failing. If that?s not the case the next step would be to attach another monitor to your computer to see if the problem disappears. If it does that points to the monitor, if it doesn?t then we need to take a look at the computer itself.
Let us know what you find out and please don?t forget to rate this posting.