Avaya 1616 display - no lights

I have an Avaya PBX with Avaya 1616 IP Phones
during the last 2 month 6 phones had the same problem: the display lights died and the numbers are not visible
all the phones are under 3yr (bought them all together)

I cannot imagine that it is just bad luck or a coincidence and trying to look for a cause.
I couldn't find any documentation on this problem and Google didn't find me any useful links.
any ideas?
LVL 17
chukuAsked:
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voipmanCommented:
check to see if they have a similar serial number may have just got a couple bad eggs in the bunch.  Do you have a contract with Avaya that replaces them when faulty?
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chukuAuthor Commented:
unfortunately, no contract. my boss did not think it is worth the money and for almost 3yr he was right
I'm out of office at the moment but we bought all the phone together so I assume if there is a manufacturer problem they all should get it BUT why after so long???
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voipmanCommented:
You may check with avaya  they might have some bug code for faulty backlights.  There could be a possiblitly of things that could happen to blow the backlight, power issue too much not enought something along those lines.
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chukuAuthor Commented:
I'll try to check with Avaya though I do not have a contract so it wouldn't matter anyway
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chukuAuthor Commented:
we could not find any solution and ended up buying new phones
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