No Video (Hdmi - Digital Signal) - Samsung UN40D6400UF Service Manual

4-1-3. No Video (HDMI - Digital Signal)

N 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.
-
Check the HDMI source
-
Major Check the Valencia
-
checkpoints This may happen when the LVDS cable connecting the Main Board and the Panel is
-
disconnected.
Diagnostics
1
2
2
Caution Make sure to disconnect the power before working on the IP board.
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the HDMI source and check the
connection of HDMI cable ?
Yes
Check the signal at Input of
Main board ?
HDMI1 Clk : Pin #31,#32 of IC601
DATA : Pin #33~#38 of IC601
HDMI2 Clk : Pin #21,#22 of IC601
DATA : Pin #23~#28 of IC601
HDMI3 Clk : Pin #11,#12 of IC601
DATA : Pin #13~#18 of IC601
HDMI4 Clk : Pin #2,#3 of IC601
DATA : Pin #4~#9 of IC601
Yes
Check the signal at Output of
'HDMI switch IC' ?
HDMI RX_Clk : Pin#116~117 of IC601
RX_Data : Pin#110~115 of IC601
Yes
Check the LVDS clk signal at output of
Main board ? (TX)
TX2_CLK : LV_TX2_DN/DP
TX4_CLK : LV_TX4_DN/DP
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
MAIN BOARD
T-CON
No
No
No
No
No
No
4. Troubleshooting
SMPS BOARD
Check a set in the 'Stand-by mode'.
Input the HDMI signal properly.
Check CN601~4.
Check HDMI cable.
Change the Main Assy.
Check IC601(HDMI switch).
Change the Main Assy.
Check IC1001(GenoaS) and
IC2001(Parma).
Change the Main Assy.
Please, Contact Tech support.
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