Question about Siemens Gigaset 8800 Cordless Expansion Handset

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8800 Gigaset lights up but won't turn on.

I have a 8800 which has been hooked upto the 8825 for about 4 years. Recently, one of my children took out the batteries and replaced them the wrong way and then set the phone back on the charger. I can along and noticed the phone off. I tried putting it back on the charger. When I pushed the power button, the phone would light up on the screen for about 20 seconds and then the lighting would turn off. Nothing appears on the screen anymore. I can call out on the phone without a display but nothing shows up on the display and is impossible to answer a call on my second line. Is the display blown? Is there a way to reset the display?

Posted by vahrmeyer on

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Anonymous

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I have seen that problem before, and it is a terminal one, sorry. You can put the batteries in backwards, and it will be okay. However, once it is set in the charger and the phone turns on, thats when the damaged occured. There is a power protection circuit (for surges), but I rarely see them open for this reverse polarity instance. The polarity reversal of the batteries does not kill the display itself (I know I have replaced them to no avail), it kills a circuit driving the display and I see the bad signals coming from the CPU which is a 80 zillion leg micro surface mount which is not cost effective to replace. Needless to say, I have about a dozen or so of them in that condition. You can google Siemens Cordless Telephone repair for repair or replacement solutions.

Posted on Jan 14, 2008

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