Service manual

4-14

4. Troubleshooting

4-1-6. No Video (Tuner DTV)

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

Major

checkpoints

Check the DTV source. T

Check the Tuner, 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 connection of RF cable?

Check the LVDS cable?

Check the T-Con B'd?

Does the digital data appear at

TP-E_TXCLK+, E_TXCLK- ,

O_TXCLK+, O_TXCLK-?

Check the 'signal strength' in Self Diagnosis

menu Strength is enough?

Does the DC B5V_TU_PW, TU33V_PW

appear at #3, #5 Pin of Tuner

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

Input the RF source properly.

Please, Contact Tech support.

Check IC1102 (SX1).

Change the Main Assy.

Input the RF cable properly.

Check the D-TV source.

Yes

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