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Backlight malfunction
Check and measure that R013 and R014 are on their places and parallel resistance is ~18.7 W. OK?
no
Change resistors and retest
yes
Measure that the voltage over N320 pin 8 is 4.1V only when backlight is activated. OK? NO
yes
Check LEDs that they are properly assembled (anode / cathode) OK? no Reassemble them and retest.
yes
no
7.CONNECTORS
no
Measure from J021 that voltage is ~Vbat when the keyboard backlight is turned on. OK?
yes Change N320 to a new one and retest.
Backlight works
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Keyboard malfunction
One or more keys don't work
Is there dirt under the keydome or keypads?
yes
Clear pads, change the keymat and retest.
no Measure - - 0HDVXUH J005, J009, J012, J013, - - J014, - J015, J016 and J022 WKDW WKH\ VKRUW circuit that they short FLUFXLW RQO\ ZKHQ specified only when VSHFLILHG keys are SUHVVHG NH\V DUH pressed.
Check Board to board connector that its properly assembled. OK?
no
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yes
Keyboard Works
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