No Video (Tuner Dtv) - Samsung T19C301 Series Service Manual

4. Troubleshooting 4. Troubleshooting

4-2-4. No video (Tuner DTV)

Symptom Audio is normal but no picture is displayed on the screen.
• Check the DTV source.
Major
• Check the Tuner, Check the Chelsea.
checkpoints
• This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
Diagnostics
Does the DC TU1.8V, TU3.3V appear at
1
Caution
Make sure to disconnect the power before working on the Main board.
4-10 4-10
Power indicator LED is off.
Lamp(Backlight) on, no video.
Yes
Check the connection of RF cable.
Yes
Check the Self Diagnosis (Support →
Self Diagnosis → Picture Test).
Dose the promblem still exist self
diagnosis?
Yes
Check the 'signal strength' in Self
Diagnosis menu Strength is enough?
Yes
#1, #4 Pin of Tuner.
Yes
Does the digital data appear at TP-E_
TXCLK+, E_TXCLK- , O_TXCLK+,
O_TXCLK-.
Yes
Check the LVDS cable?
Check the T-Con Board?
Replace the LCD panel?
Yes
Please, Contact tech support.
Check a set in the 'Stand-by mode'
No
Input the RF source properly.
No
Check external devices and
No
connections.
No Check the D-TV source.
Change the Main Assy.
No
Check IC901 (NT13).
No
Change the Main Assy