Samsung UN19C4000PD Service Manual page 35

4-1-4. No video (HDMI1, 2 - Digital signal)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the HDMI source.
-
Major
Check the HDMI switch, Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
3
2
Diagnostics
Make sure to disconnect the power before working on the IP board.
Caution
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the HDMI source and
check the connection of HDMI cable ?
Yes
Does the signal appear at
CN1003 (Pin#12 , #7 )(HDMI1)
CN1004 (Pin#12 , #7 )(HDMI2)
(HDMI RX_Clk , RX_Data) ?
Yes
Does the digital data appear at
TP - O_TXCLK+, O_TXCLK- ?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
Check a set in the 'Stand-by mode'
No
Input the HDMI signal properly.
Check CN1003, CN1004.
Check HDMI cable.
No
Change the Main Assy.
26" : BN94-03399B
22"/19" : BN94-03399C
Check IC301 (SX1)
Change the Main Assy.
No
26" : BN94-03399B
22"/19" : BN94-03399C
Please, Contact Tech support.
No
4. Troubleshooting
4-7