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How can I fix the handset display on the KX-TG5633?

The display on the handset stopped working on 2 of the 3 handsets I have with my black Panasonic KX-TG5633 phone system. How do I fix?
Jim, October 2009
download for the Service Manual for your specific model, in the circuitry there will be a LCD_pwr transistor please check the voltage check sheet for measuring the voltage across the Transistor. Primarily it can just be a loose connection of the CN part where the LCD ribbon cable goes

kirk_b, October 2009
link Click here to see other fixes for Panasonic.