Samsung YP-P2, Руководство по обслуживанию

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