Nokia 5510 - Page 80

NPM-5
UI Module Troubleshooting PAMS Technical Documentation
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)LJXUH LCD/Keyboard LED - No Light
Measure VBAT
with DVM
Is the voltage
of VBAT OK?
Replace with new
LED
Check the soldering
and connection of
the 36-pin B2B
connector to UI
board
LCD/Keyboard
LED Malfunction
YES
NO
Ensure CMT is
functioning
well