There is problem in my sony ericsson hazel that is in warranty period and no light in there in screen and all functions r running is this is physical damage or not ?

Hi,

there are several reasons why there is no light in your lcd screen.

1) you accidentally turn off its lcd backights if your unit has that features. check on it on display settings of your phone.
2) probably your phone experience accidental impact and that causes lcd flex connector to get loose and causes no light for the display.
3) busted lcd backlight or open line connection to backlights.

I recommend not to open your phone since it is very tricky to open it and there's a great chance of damaging the LCD and also your unit is still in warranty and if the warranty sticker is broken, your warranty is void. instead have it repaired to your phone dealer or provider and that saves you from trouble.

but if you really to gamble and give it a try (Don't do this if your not sure what your doing!), you can fix it yourself if the problem is on no. 2 (loose connector). open your phone slowly (since delicate parts inside and remember its part placements) using t6 or t7 screws and locate the lcd flex connector (usually behind the LCD) that connects the lcd to the main board. remove it slowly not to damage it and look for abnormalities, if none, then put it back securely and assemble your unit. then give it a try...

Good Luck!

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Hope i helped you...

bst rgrds,

John