Service manual

4-8

4. Troubleshooting

4-1-4. No video (HDMI1, 2, 3, 4 - Digital signal)

Symptom Audio is normal but no picture is displayed on the screen. T

Major

checkpoints

Check the HDMI source. T

Check the HDMI switch, Check the Chelsea. T

This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected. T

Diagnostics

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?

Does the digital data appear at

TP-E_TXCLK+, E_TXCLK- ,

O_TXCLK+, O_TXCLK-?

Does the signal appear at

CN1002 (Pin#12 , #7 )(HDMI1)

CN1006 (Pin#12 , #7 )(HDMI2)

CN1001_550 (Pin#12 , #7 )(HDMI3)

CN1004 (Pin#12 , #7 )(HDMI4)

(HDMI RX_Clk , RX_Data) ?

Check a set in the 'Stand-by mode'.

Input the HDMI signal properly.

Please, Contact Tech support.

Check IC1102 (SX1).

Change the Main Assy.

Check CN1002, CN1006

CN1001_550, CN1004.

Check HDMI cable.

Change the Main Assy.

Yes

Caution Make sure to disconnect the power before working on the IP board.