The screen on my Zoom H2 went very dim so that I could barely see anything. I tried adjusting the light but now the screen is completely dark. I've tried re-powering but that does not help. When I power up the mic light glows and when I press the record button the red light blinks as usual on the first push and then glows steady on the second push and then goes off on the third push so I think it is recording. I just can't see anything on the screen. Any ideas?
Something similar happened to mine. After looking through the a Internet, it seems like the problem might be that the contrast setting can get accidentally set to the lowest setting, which is foolishly designed to be too low. The possible solution is to use the manual and carefully guide yourself through the menus to reset the contrast, but you have to do this blind.
But this didn't work in my case and I think mine is just dead (light comes on, but nothing else works.)
My Zoom H2 had the same problem. The screen backlight worked, but nothing was displayed on the LCD. After a lot of testing and troubleshooting I found the culprit: a broken decoupling capacitor close to the LCD flat-flex connector (on the screen/SD-slot/keypad daughter board). I managed to solder in a replacement and lo and behold, the screen worked again! Perhaps worth a try?
For your sake, I really hope Daniel's advice will do the trick. If not, this is cheap stuff, for better or for worse. The good thing is, it's affordable and gives an impressive bang for the buck. The not as good thing is they have to make up the low cost somehow, and as lower specs doesn't always mean cheap enough, the components are often a very cuttable corner I'm afraid, so things break easily. You did say that the screen turned black, which might indicate that the LED's have gone bye bye. Regretfully, those can be pretty unreliable, as for example the LED's on my old Roland JUNO-60 synth is over 30 years old and still going strong, but the LED on the volume-dial on my receiver (a far from cheap Sony) passed away last year after just a few years of service. On my Roland 505, on the other hand, the #%¤&%¤ LED killed the screen altogether due to a really stupid design-flaw... So money, in this case, isn't even always a guarantee for a long serviceable life...
I have no clue how easy the Zooms is to service as such, but if it's the LED's that has bellied up, then at least the LED's themselves are pretty cheap, and having it fixed SHOULDN'T bee too expensive. If there were more than one, then you should had gotten at least half the display lit. Be sure to get a price suggestion before submitting it though, as it otherwise MIGHT be cheaper to buy a new one if you're out of luck.