Display Backlight Troubleshooting - Nokia 6265 Baseband Description And Troubleshooting

6265/6265i/6268 (RM-66)
Baseband Description and Troubleshooting

Display Backlight Troubleshooting

When troubleshooting the display backlight, make these common checks (see
• Perform a visual inspection of LCD connector and LED Driver circuitry
• If the display backlight does not turn on, check VLED +(~17V) for the main
display.
• If there, then the driver is working properly and the LED inside the display might
be faulty. Change the display.
• Check VLED + and VLED – on display driver circuitry
• Check Dlight enable line is high (~VBAT) for main LCD. If not correct, check
UEMEK.
• Check Vbat(~4V) and Vin(~4V) are present on driver inputs. If not, check power
supply connection.
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Figure 26: Display driver and circuitry
©2005 Nokia Corporation
Company Confidential
Figure 27):
Issue 1 11/2005