Display Phoenix Interface; Display Backlight Troubleshooting - Nokia 2366i Baseband Description And Troubleshooting

Nokia Customer Care

Display Phoenix Interface

Run the Display Test in Phoenix to check the display. Click Write to turn on the display
and keypad backlight.

Display Backlight Troubleshooting

Refer to Figure
checks.
1. Perform a visual inspection of the LCD connector and the LED Driver circuitry.
2. If the display backlight does not switch on, check VLED + (approximately 9 V dc)
for the main display, VLED 2+ for the external display, and VLED - (approximately
0,5 V dc) for both.
3. If the signals in the preceding step are correct, then the LED Driver IC is working
properly, and the LED inside the display may have a malfunction. Try replacing
the display.
4. If the signals are not correct, then check VLED +, VLED2+, and VLED-.
5. Check that the Klight signal is enabled (high - approximately +4 V dc) for the
external LCD. If not correct, check the UEMCR.
6. Check that the FDC signal is high (approximately 2.0 V dc) to turn on the internal
LCD and the keypad backlight LEDs. If the signal is not correct, check Vflash1 and
FLIP DETECT output.
7. Check Vbat (approximately 4 V dc) and Vin (approximately 4 V dc) are present on
the LED driver inputs. If not, check the connection to the power supply.
Issue 2 - February 2007
Figure 17: Lights tab on the Display Test dialog box
15. When troubleshooting the display backlights, make these common
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