Samsung UN19C4000PD, Service Manual

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