I have few 1692 phones which three leds on top just lit sold in read after power up. I have plug and unplug it many times but still can not resolve the problem. ....
The are likely dead and need to be replaced. I've been successful a few times by applying power then quickly removing it then repeating over and over until it comes up. 1692's are old, end of support, and don't hold up over time.
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