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Troubleshooting
4-1-5 No LCD Backlight
Symptom
LCD backlight does not turn on
1 Check the D900 terminal for 13V.
2 Check the L900 terminal for 3.1V.
Major Checklist
3 Check the R908 terminal for 2.8V.
4 Check the CON900 LCD B-to-B connector.
No LCD Backlight
Check if the voltage at
D900 is over 13V.
Check if the voltage
Check if the R908 LCD
reset is in HIGH state.
4-10
1
Yes
Refer to wave pattern
image of Table 4-5.
2
at L900 is 3.1V.
Yes
Refer to wave pattern
image of Table 4-5.
3
Yes
Refer to wave pattern
image of Table 4-5.
Completion
No
Q300 LCD_DRV signal
No
Check the DC/DC converter.
No
Check the LCD reset signal
of the CPU.
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