Is the lamp light on? Probably just need to replace the lamp. very easy to do. just remove the cover with a screw, unscrew the old lamp, pull it out, put in the new one. easy. cost you about a hundred dollars for the lamp. buy the name brand one. the generic ones burn out quickly and don't save you much money when you buy them.
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Re: hitachi 51g500 screen gone black
Yes worth repairing but not a crt problem. the crt's are powered by a high voltage transformer and sometimes it's caps that goes bad and in turn knocks out the crt's. but they are ok, it's in the high voltage line.
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there are many reason why a monitor suddenly turned off then back to work again , over use may over heat that cause the soled parts on the printed board of your CRT go loosen , try to re sold it, sometimes your PC might stop viewing so the monitor automatically shot off stby mode , loose connection due to basted parts , capacitors,power regulators,resistors , even the cables also might be.
It looks like a dead hard drive... To check your hard drive and see if you can repair it yourself,
reboot your computer
press simultaneously the "cmd" and "s" keys at startup
if you see a black screen with white text, type:
fsck -f and hit enter
this does a "file system check", when finnished, type "reboot" and press enter.
If nothing better happens, you'll certainly have to brinng it to an Apple Authorized Center
Its most likely caused by a bad solder joint on the Green CRT dive board which is located on the bootom of the green CRT ( Center CRT) which you can accesss by removing the front speaker panel then the small access pane behind the speaker panel. If the solder appears good the green CRT itself is most likely defective.
Is this monitor and LCD flat Panel? If so this is due to a bad power supply, an inverter board going bad or LCD backlight bulb blown. When the backlight goes bad it gets just enough power to start up, but when it is on for a long period of time it goes black because the bulb is not stable enough to hold the charge because it is going bad. These bulbs can be changed, but they also can be costly!