User Guide

NHM-10 Company Confidential
BB Troubleshooting CCS Technical Documentation
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Change N320 to a
new one and retest.
NO
Measure that the
voltage over N320
pin 8 is 4.1V only
when backlight is
activated. OK?
Backlight works
yes
Check LEDs
that they are
properly assembled
(anode / cathode)
OK?
Reassemble them
and retest.
no
no
Change resistors
and retest
no
yes
Check and measure
that R013 and R014
are on their places
and parallel resistance
is ~18.7 W. OK?
Measure from J021
that voltage is
~Vbat when the
keyboard backlight
is turned on. OK?
no
yes
Backlight
malfunction
7.CONNECTORS
yes