Samsung SMX-K40BN Service Manual page 18

Troubleshooting
4-10
If LCD display gets being inferior
(Being white screen, nothing comes
up on the screen)
Does
the power
supply work normally?
CN204 No 5,6
Yes
Does input signal?
CN204 No 13~22
(DIGITAL DATA,DCLK)
Yes
Check serial port of
LCD control?
CN204 No 7~9
Yes
Input
signal in CNL02
pin normal?
Yes
Change Assy-LCD
No
1.Check the connection FPC-LCD
2.Check D102(10V), Q104(3V)
No
1.Check the connection FPC-LCD
2.Check IC401
No
1.Check the connection FPC-LCD
2.Check IC401
Refer to a pattern
image of Fig 4-6
No
Check connection of LCD Panel
Samsung Electronics