Samsung UN40HU6900F, Service Manual

Page: 29 / 81

4-2-2. No Video (HDMI 1, 2, 3, 4 - Digital Signal)
Note
Refer to the next page to check the location such a CN201 or IC201 SVC Manual mentioned.
Symptom Audio is normal but no picture is displayed on the screen. •
Major
checkpoints
Check the HDMI source. •
Check the HDMI switch. •
This may happen when the LVDS cable connecting the Main Board and the Panel is •
disconnected.
Diagnostics
Power indicator LED is off.
Lamp(Backlight) on, no video ?
No Check a set in the ‘Stand-by mode’.
Yes
Check the HDMI source and check the
connection of HDMI cable ?
No Input the HDMI signal properly.
Yes
1
Check the signal at Input of Main Board ?
HDMI1 Clk
-
Pin #10, #12 of CN801
DATA •
Pin #7, #9, #4, #6, #1, #3 of
CN801
HDMI2 Clk
-
Pin #10, #12 of CN701
DATA •
Pin #7, #9, #4, #6, #1, #3 of
CN701
HDMI3 Clk
-
Pin #10, #12 of CN700
DATA •
Pin #7, #9, #4, #6, #1, #3 of
CN700
HDMI4 Clk
-
Pin #10, #12 of CN800
DATA •
Pin #7, #9, #4, #6, #1, #3 of
CN800
No
Check CN700,701,800,801
Check HDMI cable.
Change the Main Ass’y
or
Check IC1400(NT14U).
Change the Main Ass’y.
Yes
2
Check the Vby1 signal at output of
Main board.(TX)
TX6_CLK : TCON SDA
-
TX8_DATA : TCON SCL
-
No
Check IC1400(NT14U).
Change the Main Ass’y.
Yes
Check the LVDS cable?
Replace the T CON / LCD panel?
No Please, Contact tech support.
Caution Make sure to disconnect the power before working on the IP Board.
4-7
4. Troubleshooting