Nokia NHL-2NA Series Troubleshooting Instructions page 42

NHL-2NA
"Backlights are never ON"
Backlight is
"
never ON."
Is Backlight
No
ON, when
Light Sensor
setting is
OFF?
Yes
Are No
backlights
ONin
darkness?
Yes
ALD circuitry is working
Calibrate the light
sensor.
Page 36
Figure 12:
ALD troubleshooting 2
Go to Backlight
Troubleshooting
Does sensor
Use Phoenix to see reading
change with
ADC-readings and
illumination?
VCXOTEMP
(2)
Is
VCXOtemp
readind
around the
right value?
Calibrate the light
sensor.
Is the
functionality
OK?
Select default setting
for the light sensor.
¤Nokia Corporation
CCS Technical Documentation
No
Disasseble the
phone to MJS-9Q
Yes
No
Disassemble the
phone to MJS-9Q
Yes
No
Problemis beyond
economical repair
Yes
Check VFLASH1, pull-up
resistor and ambient light
sensor (3
)
Check pull-up resistor
and NTC resistor (4)
Issue 1 07/02