Samsung Electronics
4-9
Troubleshooting
4-1-5 When the LCD Back Light does not turn on
Does it operate after
replacing the LCD?
Is the USB connected
and does the MP3 play?
Finished
Finished
Yes
No
Yes
No
Does it operate
after upgrading to the latest
firmware?
Yes
Replace Board
(Requires close inspection)
When the LCD Back Light
does not turn on
Is the IC300 Pin 2 enabled?
Yes
No
Refer to wave pattern
image of Fig. 4-4.