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NHL-4/4U
Troubleshooting Instructions
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Start
Does the display
start?
Yes
End
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Try to change
UI-module. Is
No
the display
working now?
No
Check X302
(solder joints). Is
it OK?
Yes
Measure VDD (2.7V)
and VDDI (1.8V). Are
they OK?
Yes
Measure RESX(J306)
and CSX (J304)
signals. Are voltage
levels ~1.8V??
Yes
Measure SDA (J305)
and SCLK (J307)
signals. Are voltage
levels ~1.8V?
Yes
Are the display LED's
working when key is
pressed or enabled by
Phoenix SW?
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Retest failing
Yes
UI-module
No
Change X302
Check X302 and
No
lines again. If OK,
change UEM
Check X302 and
No
lines again. If OK,
change UPP
Check X302,
R308,R309 and
No
lines. If OK,
change UPP.
Illumination
No
fault
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